Journal articles on the topic 'PVA fiber reinforced concrete'
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1
Su, Jun, Jian Ping Liu, and Ming Chen. "Experimental Study on Flexural Toughness Characteristic of Polyvinyl Alcohol (PVA) Fiber Reinforced Concrete." Applied Mechanics and Materials 744-746 (March 2015): 1422–26. http://dx.doi.org/10.4028/www.scientific.net/amm.744-746.1422.
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In order to study the flexural toughness of PVA fiber reinforced concrete, employ the volume mixing ratio is 0.2%, 0.1%, 0.08%, polyvinyl alcohol (PVA) will be mixed with ordinary C40 concrete to form PVA fibers reinforced concrete. Its flexural toughness properties were tested and the load-deflection curve of all beams is obtained. Based on the ASTM method, the flexural toughness of PVA fiber reinforced concrete is analyzed. The experimental results indicate that the PVA fiber can improve the flexural toughness and the deformation ability of concrete beams remarkably. When the fiber volume ratio is 0.1%, the flexural toughness index I5 and I10 of concrete with PVA fiber are 3.73 and 6.23 times higher than that of the plain concrete respectively. The failure mode of PVA fiber concrete is changed from brittle to ductile fracture.
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Cai, Xin Hua, Zhen He, and Wen Liu. "Experimental Study on Impact Resistance of PVA Fiber Reinforced Cement-Based Composite." Applied Mechanics and Materials 584-586 (July 2014): 1630–34. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.1630.
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PVA fiber reinforced cement-based composite is a new high-performance cement-based composite material, which usually manufactured with PVA short fibers (does not exceed 2.5% vol.) and cement-based matrix. It has a significant strain-hardening characteristic and excellent crack controlling ability. Its ultimate tensile strain is up to 3% and crack width is not exceed 100μm. PVA fiber reinforced cement-based composite can be utilized to fabricated high energy absorption opponents, such as protective shield, seismic joint, impact-resistant site, etc. In this paper, the basic mechanical properties of PVA fiber reinforced cement-based composite has been tested and verified first. Then the impact resistance of PVA reinforced cement-based composite has been investigated via drop weight impact test, and compared with ones of plain concrete and steel fiber reinforced concrete with the same strength grade. Through analyzing the test results, it is concluded that PVA reinforced cement-based composite’s impact energy absorption is 48 times than plain concrete, and 9 times than steel fiber reinforced concrete respectively. The impact numbers of PVA reinforced cement-based composite is slightly lower than steel fiber reinforced concrete, but its impact absorption energy after initial cracking is 15 times than steel fiber reinforced concrete. In conclusion, PVA reinforced cement-based composite is an excellent impact material.
3
Yan, Yong Dong, Jiang Hong Mao, and Chun Hua Lu. "Experimental Research on the Durability of PVA Fibers Reinforced Concrete." Advanced Materials Research 446-449 (January 2012): 703–7. http://dx.doi.org/10.4028/www.scientific.net/amr.446-449.703.
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In order to investigate the effects of polyvinyl alcohol (PVA) fibers on the performance of concrete, such as strength, crack resistance, permeability and chloride penetration properties, experimental research were carried out in this paper . Three types of fiber reinforced concretes with 0, 0.5%, 1.0% volume fractions were designed with the same water to cement ratio of 0.43. Flat band method was used to evaluate the cracking resistance, while AutoCLAM and ASTM C1202 were adopted to measure the permeability of concrete. The experimental results showed that the workability and the compression strength decreased as PVA adding volume increasing. However, the tension and the bending strengths increased for PVA fiber concrete. The number of cracks induced by the shrinkage of concrete was reduced by adding more PVA fibers. The permeability and chloride penetration ascended as PVA volume increasing. However, all the parameters with regards to strength, crack resistance, permeability and chloride penetration for fiber reinforced concrete were more reasonable than those for the specimens without PVA fiber. In additional, a very good correlation between the permeability and the electric flux was found in this paper, that means both AutoCLAM and ASTM C1202 could be used for concrete penetration test.
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Jalal, Asif, Luqmanul Hakim, and Nasir Shafiq. "Mechanical and Post-Cracking Characteristics of Fiber Reinforced Concrete Containing Copper-Coated Steel and PVA Fibers in 100% Cement and Fly Ash Concrete." Applied Sciences 11, no. 3 (January 25, 2021): 1048. http://dx.doi.org/10.3390/app11031048.
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This experimental study investigated the effects of polyvinyl alcohol (PVA) and copper-coated steel (CCS) on the mechanical properties and the post cracking behavior of fiber reinforced concrete (FRC). In designing high-performance concrete mixes, cement replacement materials are the essential ingredients. Therefore, the research objective was to investigate PVA and CCS fiber’s post-cracking performance in 100% cement concrete and concrete with 80% cement and 20% fly ash. The fiber content was fixed as a 0.3% volumetric fraction. CSS fibers required 15% more superplasticizer to achieve the desired slump of fresh concrete than the PVA fibers. Simultaneously, CCS fibers showed a 10% higher compressive strength than the concrete made of PVA fibers. Both fibers exhibited a similar effect in developing tensile and flexural strength. PVA fibers showed a value of 47 Gpa of secant modulus, and CCS fibers resulted in 37 Gpa in 100% cement concrete. In post-cracking behavior, CCS fibers showed better performance than the PVA fibers. The reason for this is that CCS showed 2.3 times the tensile strength of the PVA fibers. In comparing the two concretes, fly ash concrete showed about 10% higher compressive strength at 56 days and about 6% higher tensile and flexural strength. Similarly, fly ash concrete showed more than 15% first crack strength and flexural toughness than the 100% cement concrete in post-cracking behavior. Fiber-reinforced concrete containing PVA or CCS fibers showed enhanced post-cracking characteristics and its use could be preferred in structural applications.
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Wu, Ying, Qiao Yao Sun, and Wei Li. "Improved Bending Strength and early Crack-Resistance Performance of Engineered Cementitious Composites Reinforced by Hybrid-Fiber." Applied Mechanics and Materials 174-177 (May 2012): 1047–50. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.1047.
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The bending strength and crack-resistance performance of blank concretes are poor, which are not favorable to the sustainable development of infrastructure. Engineered cementitious composite (ECC) is a high performance fiber-reinforced cementitious composite designed with micromechanical principles, which can improve concrete bending performance to prolong service life and to reduce maintenance cost of infrastructure, so there is important significance for sustainable development of infrastructure. In this study, we have experimentally evaluated the effectiveness of bending and crack-resistance performance of concretes reinforced by different kinds of fibers which include UF500 cellulose fiber (UF500), polyvinyl alcohol (PVA) fiber, polypropylene (PP) fiber and hybrid-fiber (PVA and UF500 cellulose fibers), respectively. The bending performance of concrete with different kinds of fibers is better than that of blank concrete. In addition, early crack-resistance performance of hybrid-fibres enhanced samples has been improved as confirmed by the three-point bending test.
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Reddy, K. Tharun Kumar, and Srikanth Koniki. "Mechanical properties of concrete reinforced with graded pva fibers." E3S Web of Conferences 309 (2021): 01177. http://dx.doi.org/10.1051/e3sconf/202130901177.
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Concrete is poor in tensile property due to its brittle nature. Improvement in the mechanical properties of concrete is carried by combining the rebars and fibers in concrete. Earlier research state that non-metallic fibres improve pre-crack performance and metallic fibers improve post crack performance. Short fibers resist the micro-cracks at an early stage and long fibers resist macro-cracks. The combination of short and long fibers makes the performance of concrete much effective. In this study, the investigation is done on non-metallic PVA fiber with the lengths of 6mm (Short fiber) and 12mm (Long fiber) by hybridization of fibers on 50MPa concrete. The investigation is done in two stages; in the first stage, the optimum dosage of fiber content and strength effectiveness of strengths is carried. Further, in the second stage the hybridization of fiber is done with the 30% SF + 70% LF, 50%SF + 50% LF, 70% SF + 30% LF for finding the optimum hybrid combination. Mechanical properties of concrete like flexural strength, split tensile strength, compressive strength is investigated. The results obtained by the hybridization of fibers are compared with the mono fiber performance and control mix. Improvement in strength parameters is observed in fiber hybridization. According to the fiber functionality, the hybrid combination of 30% SF + 70% LF showed desired results by improving the overall performance of concrete. More long fibers content improves the crack growth resistance than short fibers in concrete.
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Naik, G. Prashanth, K. Hemalatha, and Srikanth Konik. "Flexural performance of Hybrid Fiber Reinforced Polymer Concrete using PVA fiber." E3S Web of Conferences 309 (2021): 01172. http://dx.doi.org/10.1051/e3sconf/202130901172.
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This paper present the experimental result of flexural behavior of Hybrid Fiber Reinforced Polymer (HFRP) concrete beams reinforced with Glass Fiber Reinforced Polymer (GFRP) rebars and steel bars. This experiment is conducted with the aim of replacing steel reinforcement with GFRP rebars to reduce the risk of corrosion of steel in concrete structures. The data presented in this study is obtained by conducting flexural test experiment on four beams of HFRP beams with various PVA fibre dosage of 0%, 0.25% and 0.5% and one Pure FRP beam. Fly ash is added by 25% in the mix as a mineral admixture to control the shrinkage cracks. The test result showed that by addition of PVA fibre in HFRP concrete enhance the mechanical properties of beam like deflections, ductility, load carrying capacity and flexural capacity. The optimum dosage of PVA fibre is 0.25%. which improve flexural strength by 200% and 31.1% and ductility increased by 112.2% and 55.12% as compared with Pure FRP beam and HFRP beam without PVA fibre.
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Li, Shu Jin, and Hong Ping Qian. "Crack Resistance and Permeability of Hybrid Fiber Reinforced Concrete Application in Understructure Work." Applied Mechanics and Materials 438-439 (October 2013): 257–61. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.257.
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An investigation of early anti-cracking performance and permeability of hybrid cellulose fiber and PVA fiber reinforced concrete is presented in this article. The test results show that, both cellulose fiber and PVA fiber effectively improve the splitting tensile strength. The early anti-cracking performance of concrete is obviously improved by PVA and cellulose hybrid fibers, and there exists the synergistic effect for restrain matrix cracking with hybrid fibers. Based on the practical application of a subway station project during two years, result shows the underground concrete wallboard containing hybrid fibers does not produce obvious cracks and leakage problem.
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Li, Ke Liang, Zhong Zheng Yang, and Wei Ping Nie. "Fiber Reinforced Hydraulic Concrete Using Four Gradations of Aggregates." Advanced Materials Research 243-249 (May 2011): 4614–18. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.4614.
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Controlling crack of hyperbolic arch dam with a height of 305 m in Jinping hydropower station is an important problem. To improve the anti-cracking ability and reduce cracking risk of hydraulic concrete, polyvinyl alcohol (PVA) fiber and polypropylene thick fiber were used in hydraulic concrete using four gradations of aggregates. Indoor and productive tests were carried through to comparatively analyze workability, physical and mechanical properties and anti-cracking ability. Workability of fiber reinforced concrete was improved to be in favor of construction. When two kinds of fiber were used in concrete, the anti-cracking ability was greatly enhanced with lower elastic modulus-to-strength ratio and lager ultimate tensile strain. Concrete using PVA fiber had better anti-cracking ability than that of concrete using polypropylene thick fiber. PVA fiber reinforced concrete was applied in Jinping hydropower station. It is proved that PVA fiber reinforced concrete has good properties reaching design requirements of workability, compressive strength, ultimate tensile strain, frost resistance, permeability resistance.
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Hulle, Vrushabh K. "Experimental Study on Fiber Reinforced Concrete Using PVA Fiber and Glass Powder." International Journal for Research in Applied Science and Engineering Technology 9, no. 8 (August 31, 2021): 2707–13. http://dx.doi.org/10.22214/ijraset.2021.37708.
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Abstract: Concrete consisting of cement, water, fine and coarse aggregates are widely used in civil engineering constructions. Though making concrete is convenient and inexpensive, its brittle behavior upon tensile loading is one of its undesirable characteristics so that leads to the development of fiber reinforced concrete or engineered cementitious composites to improve this deficient. The Flexural strength of PVA (polyvinyl alcohol) FRC (fiber reinforced concrete) can be 150-200% greater than for normal concrete. According to Structural designers the damage tolerance and inherent tight crack width control of PVA FRC is found to be impressive in recent full-scale structural applications. If proper volume fractions are used the compressive strength PVA FRC can be similar to that of conventional concrete. The aim of this research work is to study compressive and tensile strength of FRC consisting PVA fiber & glass powder and studying the effect of glass powder in it. This research also gives rough idea on crack resistance capacity of FRC. In this paper we studied and provided detailed review on properties of PVA FRC with glass powder and experimentally identified the best ECC mix by analyzing the compressive & the flexural strength at different ratios like 0.5%, 1%, 1.5% of PVA fiber of total dry mix weight and in each case 15% of fine aggregate was replaced by glass powder. By conducting the compressive strength test and flexural strength test the maximum result we get at 28 days is 28.38Mpa and 8.95Mpa respectively which is more durable as compared to conventional concrete by IS 516:1959. So by analysis of results it can be seen that 1% mix is found to be optimum in all aspects. Keywords: PVA FRC, Polyvinyl Alcohol, Fibre Reinforced Concrete, Glass Powder.
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Krishnaraja, A. R., and S. Kandasamy. "Flexural Performance of Engineered Cementitious Compositelayered Reinforced Concrete Beams." Archives of Civil Engineering 63, no. 4 (December 1, 2017): 173–89. http://dx.doi.org/10.1515/ace-2017-0048.
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Abstract This study focuses to develop a new hybrid Engineered Cementitious Composite (ECC) and assesses the performance of a new hybrid ECC based on the steel short random fiber reinforcement. This hybrid ECC aims to improve the tensile strength of cementitious material and enhance better flexural performance in an RC beam. In this study, four different mixes have been investigated. ECC with Poly Vinyl Alcohol (PVA) fiber and PolyPropylene (PP) fiber of 2.0% volume fraction are the two Mono fiber mixes; ECC mix with PVA fiber of 0.65% volume fraction hybridized with steel fiber of 1.35% volume fraction, PP fiber of 0.65% volume fraction hybridized with steel of 1.35% volume fraction are the two additional different hybrid mixes. The material properties of mono fiber ECC with 2.0 % of PVA is kept as the reference mix in this study. The hybridization with fibers has a notable achievement on the uniaxial tensile strength, compressive strength, Young’s modulus, and flexural behavior in ECC layered RC beams. From the results, it has been observed that the mix with PVA fiber of 0.65% volume fraction hybrid with steel fiber of 1.35% volume fraction exhibit improvements in tensile strength, flexural strength, and energy absorption. The PP fiber of 0.65% volume fraction hybridized with steel of 1.35% volume fraction mix has reasonable flexural performance and notable achievement in displacement ductility over the reference mix.
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Afroughsabet, Vahid, Luigi Biolzi, and Sara Cattaneo. "Evaluation of Engineering Properties of Calcium Sulfoaluminate Cement-based Concretes Reinforced with Different Types of Fibers." Materials 12, no. 13 (July 4, 2019): 2151. http://dx.doi.org/10.3390/ma12132151.
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Calcium sulfoaluminate (CSA) cement has recently gained increased attention due to its lower amount of CO2 emissions, as compared to that of the ordinary Portland cement (OPC). This paper evaluates the impact of different types of fibers on the engineering features of CSA-based concretes at different water-cement ratios of 0.35 and 0.28. In this study, metallic fibers including double hooked-end steel fibers and hooked-end steel fibers, and non-metallic fibers (i.e., polyvinyl alcohol (PVA) fibers) were utilized at fiber content of 1%. The mechanical properties of concretes were assessed at different curing ages. Dimensional stability of the concrete mixes was also examined. The morphology of the fractured specimens was studied by using the SEM method. The results indicate that the engineering properties of concrete were improved by introducing fibers to the concrete, irrespective of fiber type. The results show that DHE steel fiber has an important effect on the flexural performance of CSA cement-based concretes and results in deflection-hardening behavior. It was observed that fibers and particularly PVA fibers cause a decrease in shrinkage deformation. Microstructure tests demonstrate that prismatic ettringite is the main hydration product of CSA cement-based concrete. The SEM observation also confirms that the inclusion of CSA cement in concrete improves the cohesiveness between the fibers and cement matrix.
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Abbass, Wasim, and M. Iqbal Khan. "Mechanical properties of Hybrid steel/PVA fibers reinforced high strength concrete." MATEC Web of Conferences 199 (2018): 11005. http://dx.doi.org/10.1051/matecconf/201819911005.
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The high strength concrete exhibits improved compressive strength with drawback of brittle failure due to lack of tensile strength which can be catered by the addition of fibers. The efficient use of fibers with hybridization at macro and micro level can improve mechanical properties of high strength concrete. The effect of hybridization of hooked end steel macro fibers (60 mm) and PVA micro fibers (12 mm) with different dosages was investigated in this research work. The different percentage of steel and PVA were hybridized to find out the best combination of hybridized fibers in high strength concrete. The compressive and flexural properties of high strength concrete along with complete load vs deflection behaviour of hybrid fiber reinforced concrete were investigated. The results revealed that hybridization of macro and micro fibers provided better improvement in flexural performance. It was observed from the results that the hybrid combination of fibers of 1% macro steel fiber and 0.15% micro PVA fibers proved to be the best for enhancement in flexural performance of high strength concrete.
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Lee, Su-Jin, Hyung-Jin Shin, and Chan-Gi Park. "Strength and Durability of Hybrid Fiber-Reinforced Latex-Modified Rapid-Set Cement Preplaced Concrete for Emergency Concrete Pavement Repair." Applied Sciences 11, no. 10 (May 18, 2021): 4595. http://dx.doi.org/10.3390/app11104595.
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The benefits of using reinforcing fibers in latex-modified rapid-set cement preplaced concrete for emergency pavement repairs were examined in terms of strength, permeability, and durability as functions of the type of fiber. Single-type fibers, including jute, poly (vinyl alcohol) (PVA), and nylon fibers, as well as hybrid fiber mixtures prepared with two of the aforementioned fibers at a 1:1 weight ratio, were evaluated. Fibers were incorporated into the concrete mixture at 1.2 kg/m3. A vibratory press compactor that simulates roller compaction was used to increase compaction and densification of the resulting pavement repair material. The hybrid fiber-reinforced latex-modified rapid-set cement preplaced concrete (HFLMC) was manufactured to satisfy the criteria for opening traffic, i.e., compressive strength of 21 MPa or higher, and flexural strength of 3.5 MPa or higher after 4 h. Pavement requiring repair was removed and replaced with coarse aggregate. The rapid-set binder, fibers, and latex were then mixed and placed onto the coarse aggregate layer. The repair was considered complete after compaction. The resulting HFLMC satisfied all of the test criteria. Furthermore, concretes made with hybrid fibers were more mechanically sound than those made with a single fiber variety. Hybrid fiber concretes made with PVA and nylon fibers exhibited the best properties for emergency pavement repair. These results indicate that HFLMC is suitable for emergency pavement repair.
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Naik, G. Prashanth, Srikanth Koniki, and Hemalatha. "Comparative study of Conplast SP 430 and Polycarboxylic Ether based super plasticizer on M50 grade PVA-FRC." E3S Web of Conferences 309 (2021): 01173. http://dx.doi.org/10.1051/e3sconf/202130901173.
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The properties of conventional concrete is improved by addition of fiber in it. By addition of these fibers ductility of concrete is enhanced and brittleness of concrete reduced. In this study Polyvinyl alcohol (PVA) fibers are used as a reinforcing material. Polyvinyl alcohol is a high resistance nonreactive material. It will not oxidize when exposed to aggressive whether conditions and having good affinity with cement. Polyvinyl alcohol fibre of size 6 mm added in five proportions of 0%, 0.125%, 0.25%, 0.375% and 0.5%. the workability of concrete decreased by addition of PVA fibers in it. So, the superplasticizers are used to improve the workability. In this study two different plasticizers Conplast SP 430 and Polycarboxylic Ether (PCE) are used and their performance on the workability and strength of concrete was worked out. The main reason for conducting this study is to find out the optimum dosage of PVA fibers, optimum dosage of super plasticizer and suggest which super plasticizer is more suitable for preparation of Polyvinyl alcohol fiber reinforced concrete.
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Gyawali, Tek Raj. "Mixing of High Ductile Mortar (HDM) in Concrete Mixers." Journal of Engineering Technology and Planning 1 (December 1, 2019): 1–10. http://dx.doi.org/10.3126/joetp.v1i0.38238.
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Plain concrete is strong in compression, but very weak in tension. Tensile strength of plain concrete is about10 to 15% of the compressive strength depending upon the grade of concrete. Another limitation of plain concrete is that it is brittle in failure. Fiber-reinforced concrete (FRC) is the concrete made primarily of hydraulic cements, aggregates, and discrete reinforcing fibers. Fibers suitable for reinforcing concrete are produced from steel, glass, and organic polymers (synthetic fibers). Author hereby has attempted to develop the High Ductile Mortar (HDM) using Poly Vinyl Alcohol (PVA) fibers. HDM may replace the steel fibers to increase the flexural strength and deflection. It also lightens the structure than steel fiber reinforced concrete (SFRC). This paper gives the brief history of HDM development results which were mixed in small mortar mixer of 10 liter capacity. Then, it presents the results of HDM mixed in two different concrete mixers of 100 liter capacity using different PVA fibers and sands.
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Rao, Lan, Ling Wang, and Yun Zheng. "Experimental Research on Mechanical Properties and Compression Constitutive Relationship of PVA Fiber-Reinforced Coral Concrete." Materials 15, no. 5 (February 26, 2022): 1762. http://dx.doi.org/10.3390/ma15051762.
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In this paper, the mechanical properties of coral concrete with different strength and different polyvinyl alcohol (PVA) fiber content under compression were experimentally investigated. The results show that adding an appropriate amount of PVA fiber could obtain satisfactory mechanical properties of coral concrete. The stress–strain constitutive relationship of plain and PVA fiber-reinforced coral concrete was investigated by prism uniaxial compression test. The results shown that the incorporation of PVA fiber had a significant effect on limiting the development of concrete internal cracks, and effectively improved the mechanical properties of coral concrete after cracking, especially the toughness. Different constitutive models from previous research were used to describe the axial compressive stress–strain relationship of plain and PVA fiber-reinforced coral concrete, and a piecewise function model was finally selected which is most consistent with the experimental curve and its characteristic points. In addition, determination of critical parameters for the selected constitutive model was proposed, and experimental validations confirmed its accuracy.
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Xiao, Shuhua, Yongjian Cai, Yongchang Guo, Jiaxiang Lin, Guotao Liu, Xuewei Lan, and Ying Song. "Experimental Study on Axial Compressive Performance of Polyvinyl Alcohol Fibers Reinforced Fly Ash—Slag Geopolymer Composites." Polymers 14, no. 1 (December 30, 2021): 142. http://dx.doi.org/10.3390/polym14010142.
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Geopolymer concrete (GC) has been gaining attention in research and engineering circles; however, it is a brittle material with poor tensile performance and crack resistance. To address these problems, we introduced fibers into GC. In this study, axial compression and scanning electron microscope (SEM) tests were carried out on polyvinyl alcohol (PVA) short fiber reinforced low-calcium fly ash-slag-based geopolymer concrete (PFRGC). The ratio of PVA short fibers and low-calcium fly ash on the compression behavior of fiber reinforced geopolymer concrete (FRGC) were investigated and discussed. The test results show that PVA fibers play a bridging role in the cracks of the specimen and bear the load together with the matrix, so the addition of PVA fibers delayed the crack propagation of GC under axial compression. However, with the increase of low-calcium fly ash/PVA fibers, the number of unreacted fly ash particles in PFRGCs increases. Too many unreacted fly ash particles make GC more prone to micro-cracks during loading, adversely affecting compressive properties. Therefore, the axial compressive strength, elastic modulus, and Poisson’s ratio of GC decrease with the increasing low-calcium fly ash/PVA fibers.
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Sai Sree, K. Sharmila, and Srikanth Koniki. "Mechanical Properties of PVA & Steel Hybrid Fiber Reinforced Concrete." E3S Web of Conferences 309 (2021): 01174. http://dx.doi.org/10.1051/e3sconf/202130901174.
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Combining various kinds of fibre to achieve good response and strength from the concrete by using different experiments is shown in this research. Here PVA which is polyvinyl alcohol and HS hooked end steel fibres are used to gain more strength compared with normal concrete or single fibre concrete. Here first we take PVA specimens results by considering optimum dosage 0.15% result & HS fibre is taken as HFRC concrete by this the strength of the concrete can control the crack behavior occurred in specimens. Mechanical properties such as compressive strength test, flexure strength, and stress-strain behavior are studied. Combining different fibers HFRC is mainly useful for longstanding structures. This method can be easy to understand and economical.
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Xiao, Qidan, Liuyang Feng, Yapei Xia, and Fandong Xu. "Characterization of PVA Fiber-Reinforced Pervious Concrete with Blended Recycled Ceramic Aggregates and Natural Aggregate." Advances in Materials Science and Engineering 2022 (March 22, 2022): 1–10. http://dx.doi.org/10.1155/2022/4375043.
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Effective industrial waste management is one of the important challenges facing modern society. Ceramic wastes occupy an important proportion of industrial waste. The utilization of waste of ceramics is becoming more and more attractive for many researchers to alleviate the environmental impact of industrial waste. As a low-impact development method, pervious concrete (PC) received more and more attention from researchers in recent years. However, the relatively low strength compared with ordinary concrete restricts the application of pervious concrete. This research used recycled ceramic coarse aggregates (RCCA) to partially replace natural coarse aggregates (NCA) to prepare recycled ceramic coarse aggregate pervious concrete (RCCAPC) and fiber-reinforced RCCAPC incorporating polyvinyl alcohol (PVA) fibers, and the effect of the replacement rate of RCCA and the amount of PVA fiber on the mechanical properties and permeability was investigated. The results show that RCCA can improve the mechanical properties of PC at a low substitution rate, as well as PVA fiber, and when the PVA content is about 0.3%, the enhancement effect is the best. Both RCCA replacement rate and PVA fiber content have little effect on the permeability coefficient of PC. Based on described studies, using RCCA to partially replace NCA at a low substitution rate is suitable for the preparation of PC, and PVA fibers can enhance the strength of PC, which may help to broaden the application scenarios of PC.
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Nam, Jeong Soo, Gyu Yong Kim, Hiroyuki Miyauchi, Young Seok Jeon, and Heon Kyu Hwang. "Evaluation on the Blast Resistance of Fiber Reinforced Concrete." Advanced Materials Research 311-313 (August 2011): 1588–93. http://dx.doi.org/10.4028/www.scientific.net/amr.311-313.1588.
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Recently, the damaged building and loss of life have been increasing by man-made disasters. In this study, the blast resistance performance of fiber reinforced concrete against explosion was evaluated by the emulsion explosive and AUTODYN. The concrete without fiber was penetrated by emulsion explosive of 4605 kJ/kg and its back side was fractured heavily. The concretes with PVA, PE and Steel fiber have a higher blast resistance than that of concrete without fiber. Consequentially, the blast resistance of concrete was analyzed from viewpoint of fracture mode by AUTODYN and it was concluded that the fiber content is a beneficial for the blast resistance performance of concrete.
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Kim, B., A. J. Boyd, and J. Y. Lee. "Durability performance of fiber-reinforced concrete in severe environments." Journal of Composite Materials 45, no. 23 (April 26, 2011): 2379–89. http://dx.doi.org/10.1177/0021998311401089.
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Polypropylene (PP; 0.5%), polyvinyl alcohol (PVA; 0.75%), and hooked-end steel (1%) fibers were investigated to evaluate the durability performance of fiber-reinforced concrete (FRC) exposed to severe environments. Conventional beam specimens (100 × 100 × 360 mm3) were prepared and exposed to three types of conditioning systems for 27 months, in both un-cracked and pre-cracked conditions. Degradation of the FRC was evaluated using visual or photographic inspection, change in permeable pore space, destructive beam testing, scanning electron microscopy analysis, and depth of carbonation measurements. For each of the fiber types and mixtures evaluated, significant surface degradation and carbonation only appeared in specimens exposed to immersion in a low pH solution designed to simulate swamp water. These specimens also exhibited significant degradation in both average residual strength (ARS) and toughness. On the other hand, difficulties in the comparison between pre-cracked specimens and un-cracked specimens were found due to re-adhered or healed pre-cracked specimens from dissolved materials (salt or lime) in solutions. A relatively good resistance to saltwater immersion and w/d conditioning was observed for all fiber types. Among fiber types, steel fibers showed the highest strength to conditioning compared with PP and PVA fibers.
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Chen, Le, Weiwei Sun, Bingcheng Chen, Sen Xu, Jianguo Liang, Chufan Ding, and Jun Feng. "A Comparative Study on Blast-Resistant Performance of Steel and PVA Fiber-Reinforced Concrete: Experimental and Numerical Analyses." Crystals 10, no. 8 (August 16, 2020): 707. http://dx.doi.org/10.3390/cryst10080707.
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This paper deals with the blast-resistant performance of steel fiber-reinforced concrete (SFRC) and polyvinyl alcohol (PVA) fiber-reinforced concrete (PVA-FRC) panels with a contact detonation test both experimentally and numerically. With 2% fiber volumetric content, SFRC and PVA-FRC specimens were prepared and comparatively tested in comparison with plain concrete (PC). SFRC was found to exhibit better blast-resistant performance than PVA-FRC. The dynamic mechanical responses of FRC panels were numerically studied with Lattice Discrete Particle Model-Fiber (LDPM-F) which was recently developed to simulate the meso-structure of quasi-brittle materials. The effect of dispersed fibers was also introduced in this discrete model as a natural extension. Calibration of LDPM-F model parameters was achieved by fitting the compression and bending responses. A numerical model of FRC contact detonation was then validated against the blast test results in terms of damage modes and crater dimensions. Finally, FRC panels with different fiber volumetric fractions (e.g., 0.5%, 1.0% and 1.5%) under blast loadings were further investigated with the validated LDPM-F blast model. The numerical predictions shed some light on the fiber content effect on the FRC blast resistance performance.
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Ye, Yan Xia, Long Hai Qin, Tao Liu, and Xiang Yang Sun. "Experimental Study on Seismic Performance of Small Span-to-Depth Ratio Coupling Beams with PVA Fiber Reinforced Concrete." Applied Mechanics and Materials 513-517 (February 2014): 134–37. http://dx.doi.org/10.4028/www.scientific.net/amm.513-517.134.
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A series of pseudo-static tests were conducted with 4 coupling beams whose span-depth ratio 1.2. Common reinforced concrete and PVA fiber reinforced concrete were used for different specimens. In each of the specimens, there were longitudinal reinforcement, constructional reinforcement and stirrup, one of the specimens had crossed reinforcing bars. The failure mode of the coupling beams were studied, as well as hysteretic behavior. The test result indicated that using PVA fiber reinforced concrete could improve coupling beams carrying capacity, and could also reduce the amount of stirrup needed for seismic calculation; PVA members ductility was also improved.
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Abadel, Aref A., and Yousef R. Alharbi. "Confinement effectiveness of CFRP strengthened ultra-high performance concrete cylinders exposed to elevated temperatures." Materials Science-Poland 39, no. 4 (December 1, 2021): 478–90. http://dx.doi.org/10.2478/msp-2021-0040.
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Abstract Fire-related damage is an alarming concern to reinforced concrete (RC) structures throughout their service lives. When exposed to extreme temperatures, concrete can endure severe damage. Given that a complete replacement and/or demolition of fire-damaged structures can be an economic waste, a more viable option for extending the service life of the damaged structures involves repairing or strengthening the damaged members. Due to its more efficient qualities over conventional concrete, the use of concrete, such as ultra-high-performance concrete (UHPC) in the building industry, has dramatically grown in recent years. However, limited information is available about the confinement behavior of the unheated and heated UHPC members, particularly when wrapped with fiber-reinforced polymers (FRP). This paper investigates the effect of carbon fiber reinforced polymer (CFRP) sheet strengthening on the compressive strength of both UHPC and ultra-high-performance fiber reinforced concrete (UHPFRC). In this study, strengthening has been considered for the UHPC cylinders before and after they were subject to an elevated temperature of 400°C, and they were left to cool by air cooling. Six UHPC mixes, which were made without the use of fibers, steel fibers (SF) alone, a hybrid system of SF and polyethylene alcohol (PVA), in addition to a hybrid system of steel, PVA, and polypropylene (PP) fibers were tested. Regarding the plain and various fiber-reinforced UHPC both at room temperature and after being exposed to 400°C, the ultimate compressive strength of CFRP-confined concrete has shown an increase by 25% to 33% and 52% to 61%, respectively compared with the unheated specimens.
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Dopko, Michael, Meysam Najimi, Behrouz Shafei, Xuhao Wang, Peter Taylor, and Brent M. Phares. "Flexural Performance Evaluation of Fiber-Reinforced Concrete Incorporating Multiple Macro-Synthetic Fibers." Transportation Research Record: Journal of the Transportation Research Board 2672, no. 27 (October 10, 2018): 1–12. http://dx.doi.org/10.1177/0361198118798986.
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Fiber-reinforced concrete (FRC) is a promising construction material mainly because of the crack-controlling mechanisms that discrete fibers can impart to inherently brittle concrete. Macrofibers, in particular, have been proven effective for providing post-crack ductility and toughness, while synthetic fibers are a promising solution to avoid corrosion-related durability issues. To assess the performance enhancement provided by macro-synthetic concrete fibers, this study performs flexural tests on FRC beams containing three different types of macro-synthetic fibers. The selected fibers include polypropylene (PP), polyvinyl alcohol (PVA), and alkali-resistant glass (ARG) macrofibers mixed at volume fractions of 0.5%, 1.0%, and 1.5%. Static and dynamic fresh properties are monitored using the vibrating Kelly ball (VKelly) test. Beam specimens are then placed under a third point bending configuration, as per ASTM C1609 Standard, to measure load versus mid-span deflection. Strength and toughness parameters are derived from the load–deflection data to assess the flexural performance of the FRC composite systems under consideration. The parameters of interest include first peak strength (pre-crack flexural strength) and post-crack residual strength and toughness provided by fiber addition. Of the mixtures tested, ARG fiber mixtures show the highest residual strength and toughness values, followed by PP and PVA fiber mixtures. ARG fibers produce the most workable mixtures at all fiber volumes, while PVA fibers show a tendency to encounter dispersion issues at higher volume doses. The outcome of this study is expected to facilitate the selection of fibers by giving insight into their relative contribution to fresh and hardened flexural properties of FRC.
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Yao, Wenjin, Weiwei Sun, Ze Shi, Bingcheng Chen, Le Chen, and Jun Feng. "Blast-Resistant Performance of Hybrid Fiber-Reinforced Concrete (HFRC) Panels Subjected to Contact Detonation." Applied Sciences 10, no. 1 (December 28, 2019): 241. http://dx.doi.org/10.3390/app10010241.
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This paper experimentally investigates the blast-resistant characteristics of hybrid fiber-reinforced concrete (HFRC) panels by contact detonation tests. The control specimen of plain concrete, polypropylene (PP), polyvinyl alcohol (PVA) and steel fiber-reinforced concrete were prepared and tested for characterization in contrast with PP-Steel HFRC and PVA-Steel HFRC. The sequent contact detonation tests were conducted with panel damage recorded and measured. Damaged HFRC panels were further comparatively analyzed whereby the blast-resistance performance was quantitively assessed via damage coefficient and blast-resistant coefficient. For both PP-Steel and PVA-Steel HFRC, the best blast-resistant performance was achieved at around 1.5% steel + 0.5% PP-fiber hybrid. Finally, the fiber-hybrid effect index was introduced to evaluate the hybrid effect on the explosion-resistance performance of HFRC panels. It revealed that neither PP-fiber or PVA-fiber provide positive hybrid effect on blast-resistant improvement of HFRC panels.
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Kim, Byoungil, and Jung-Youn Lee. "Relationships between mechanical and transport properties for fiber reinforced concrete." Journal of Composite Materials 46, no. 13 (October 17, 2011): 1607–15. http://dx.doi.org/10.1177/0021998311421691.
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This study investigated the mechanical and transport properties of the important factors of fiber-reinforced concrete (FRC) for the design of durable concrete structures. The fibers that are commonly used in industry, such as 1% steel, 0.5% polypropylene (PP), and 0.75% polyvinyl alcohol (PVA) fibers, were evaluated. The addition of PP, PVA, and steel fibers, as they have been known, had little or no effect on compressive and tensile strengths but significantly affected postcracking behaviors and the critical transport mechanisms. The change of the permeable pores seems to depend on the material property of fibers between the fiber and the matrix interface. Among the fiber types used in this study, hook end steel fibers showed the best performance for both the mechanical and transport properties. Generally, as the permeable pore spaces increased, the strength as well as the resistance of transport properties also decreased. However, the effect of the permeable voids on the transport properties was much greater than that of the compressive strength. When the transport properties obtained are employed for the design of durable FRC, major properties such as the permeable voids and absorption by capillary action are important factors to be considered first for resisting movement of harmful substances into concrete.
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Fořt, Jan, David Čítek, Milena Pavlíková, and Zbyšek Pavlík. "The Effect of High Temperature Exposure on Properties of Hybrid Fiber Reinforced UHPC." Materials Science Forum 909 (November 2017): 275–79. http://dx.doi.org/10.4028/www.scientific.net/msf.909.275.
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High Performance Fiber Reinforced Concrete (HPFRC) became very popular material for its high mechanical strength, elastic modulus and corrosion resistance. However, also its high-temperature resistance is of a particular importance because of the fire safety. Therefore, the effect of high-temperature exposure on UHPC reinforced by combination of steel and PVA fibers was studied in the paper. PVA fibers were used to moderate concrete damage induced by water vapor evaporation from dense UHPC matrix. The UHPFRC samples were exposed to the temperatures of 200 °C, 400 °C, 600 °C, 800 °C, and 1 000 °C respectively. Concrete structural changes induced by high temperature action were described by the measurement of basic physical and mechanical properties. The realized experiments provide information on the changes of concrete porosity and loss of mechanical resistivity.
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Yan, Chang Wang, Jin Qing Jia, Ju Zhang, and Rui Jiang. "Compressive Strength and Splitting Tensile Strength of Polyvinyl Alcohol Fiber Reinforced Ultra High Strength Concrete (PFRC)." Advanced Materials Research 150-151 (October 2010): 996–99. http://dx.doi.org/10.4028/www.scientific.net/amr.150-151.996.
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The marked brittleness with low tensile strength and strain capacities of ultra high strength concrete (UHSC) with compressive strength of 100 MPa can be overcome by the addition of polyvinyl alcohol (PVA) fibers. The compressive strength and splitting tensile strength of ultra high strength concrete containing PVA fibers are investigated this paper. The PVA fibers were added at the volume fractions of 0%, 0.17%, 0.25%, 0.34% and 0.5%. The compressive strength of the PVA fiber reinforced ultra high strength concrete (PFRC) reached a maximum at 0.5% volume fraction, being an 8.2% improvement over the UHSC. The splitting tensile strength of the PFRC improved with increasing the volume fraction, achieving 46.7% improvements at 0.5% volume fraction. The splitting strength models were established to predict the compressive and splitting tensile strengths of the PFRC. The models give predictions matching the measurements.
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Su, Qiang, Jin-Ming Xu, and Yong-Dong Wang. "Mechanical Properties of Hybrid Fiber Reinforced Rubber Concrete." Materials 14, no. 20 (October 13, 2021): 6028. http://dx.doi.org/10.3390/ma14206028.
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Orthogonal experiments were designed for hybrid fiber rubber concrete (HFRC). The mechanical properties of HFRC were tested and compared with ordinary concrete. The effects of basalt fiber volume ratio (VBF), PVA fiber volume ratio (VPF) and rubber volume ratio (VR) on the compressive strength, splitting tensile strength and flexural strength of HFRC were analyzed. The results show that the strength of HFRC is the best when the volume ratio of basalt fiber is 0.3%, the volume ratio of PVA fiber is 0.2% and the volume ratio of rubber is 5%. Basalt fiber has the greatest influence on the strength of HFRC. The strength of HFRC mixed with hybrid fiber is greatly improved, which reflects the good fiber “positive hybrid effect”. With the increase of rubber volume ratio, the strength of HFRC decreases gradually. With the help of SEM and EDS, the toughening and cracking resistance mechanism of the fiber to HFRC was analyzed. Finally, the strength of HFRC was predicted by model.
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Ayub, Tehmina, Nasir Shafiq, and Muhd Fadhil Nuruddin. "Analytical Prediction of the Mechanical Properties of High Performance PVA Fiber Reinforced Concrete." Applied Mechanics and Materials 567 (June 2014): 345–50. http://dx.doi.org/10.4028/www.scientific.net/amm.567.345.
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In this paper, mechanical properties of three series of high performance fiber reinforced concrete (HPFRC) containing 1, 2 and 3% of Polyvinyl Alcohol (PVA) fiber volume are presented. The first series of HPFRC was prepared by using 100% cement, whereas remaining two series were prepared by replacing 10% cement content with silica fume and locally produced metakaolin. All series were designed with water to binder ratio (w/b) of 0.4. The mechanical properties determined in this study include compressive strength, splitting tensile strength and flexural strength. Testing of the specimens was conducted at the 28 days of curing. Experimental results showed that the 3% PVA fiber is the optimum fiber volume to improve the mechanical properties of HPFRC. The variation in the mechanical properties due to the addition of PVA fibers was investigated and presented in the form of mathematical relationship. Further, interrelationship among the mechanical properties was also determined.
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Wu, Yuexiu, Wanpeng Song, Wusheng Zhao, and Xianjun Tan. "An Experimental Study on Dynamic Mechanical Properties of Fiber-Reinforced Concrete under Different Strain Rates." Applied Sciences 8, no. 10 (October 12, 2018): 1904. http://dx.doi.org/10.3390/app8101904.
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Fiber-reinforced concrete (FRC) has a great advantage in earthquake-resistant structures, as compared with regular concrete. However, there are many difficulties in the construction and maintenance of concrete structures due to the high density and easy corrosion of the steel fiber in commonly used steel FRC. With the development of polymer material science, polyvinyl alcohol (PVA) fiber has been rapidly promoted for use in FRC because of its low density, high strength, and large elongation at break value. Dynamic uniaxial compression and splitting tensile experiments of FRC with PVA fiber were carried out with two matrix strengths (i.e., C30 and C40), which were blended with PVA fibers with a length of 12 mm in different volume contents (0, 0.2, 0.4, and 0.6%), at the age of 28 days, under different strain rates (i.e., 10−5, 10−4, 10−3, and 10−2 s−1). The results show that PVA has an obvious enhancing and toughening effect on concrete, which can improve its brittle properties and residual strength. With increasing strain rate, the compressive strength, split tensile strength, and elastic modulus increase to a certain extent, while the toughness index and the peak strain decrease to a certain degree. The post-peak deformation characteristic changes from a brittle failure of sudden caving to a ductile failure with dense cracking. The effect of PVA is different when enhancing the concrete with two different matrix strengths. The lower the matrix strength, the more obvious the enhancement effect of the fiber, showing characteristics of a higher compressive strength and low split tensile strength in FRC with low strength and a smoother post-peak stress–strain curve.
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Kim, Ki-Won, Chan Yu, Jae-Woong Han, and Chan-Gi Park. "Strength and durability of rapid set PVA fiber reinforced LMC for pavement repair." Polymers and Polymer Composites 27, no. 4 (January 10, 2019): 179–88. http://dx.doi.org/10.1177/0967391118821012.
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This study evaluated the strength properties, chloride ion permeability and abrasion resistance of styrene–butadiene latex-modified polyvinyl alcohol (PVA) fibre-reinforced rapid-set cement concrete (LMFRRSC) for application to emergency repair of concrete pavements. Experiments were conducted to measure the compressive strength, flexural strength, splitting tensile strength, bond strength, chloride ion penetration and abrasion resistance of LMFRRSC for variable PVA fibre content (0, 0.05 and 0.10%); test results showed that these test parameters increased with the volume fraction of PVA fibre, satisfying all traffic-opening criteria for emergency concrete pavement repair. The PVA fibre additive effectively minimized crack formation generated as a result of high hydration heat in the early material stages and inhibited fibre ball development. Thus, the addition of PVA fibre enhanced the performance of LMFRRSC for emergency repair of concrete pavements.
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Xiao, Kai Tao, Jia Zheng Li, and Hua Quan Yang. "Study of Crack Resistance Property of Polyvinyl Alcohol Fiber Reinforced Concrete." Advanced Materials Research 287-290 (July 2011): 178–82. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.178.
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The strength, ultimate tensile value, compressive elastic modulus and drying shrinkage of polyvinyl alcohol fiber reinforced concrete were studied by tests, and its crack resistance property was also studied by plate method and temperature stress testing machine. The test results showed that PVA fiber could improve the tensile strength and ultimate tensile value of concrete, lower its compressive elastic modulus and drying shrinkage, restrain its early plastic shrinkage and drying shrinkage cracks, reduce its cracking temperature and improve the crack resistance property of concrete, moreover, the effect of long PVA fiber was better.
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Abd Elmoaty, Abd Elmoaty M., Alaa M. Morsy, and Abdelrhman B. Harraz. "Effect of Fiber Type and Volume Fraction on Fiber Reinforced Concrete and Engineered Cementitious Composite Mechanical Properties." Buildings 12, no. 12 (December 1, 2022): 2108. http://dx.doi.org/10.3390/buildings12122108.
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Engineered cementitious composites (ECC) are an ultra-ductile cement-based composite material reinforced with short randomly distributed fibers. It differs from fiber reinforced concrete (FRC) in that it has a distinct ductile behavior. The study aims to assign mechanical properties, such as tensile, flexural, and compressive strength using locally available fiber rather than polyvinyl alcohol (PVA) fiber, which is not widely available in many countries, to ECC. PVA fiber is also very expensive. Instead of PVA, lightweight fibers, such as polypropylene, polyolefin, and glass fiber, as well as heavyweight fibers, such as steel fiber, were used. To assess the mechanical properties, the influences of curing, fiber volume fraction (2%, 4%, and 6%), fiber type, and fiber hybridization were adjusted in this study. The formation of multiple cracks along the specimen is the governing factor in ECC formation. The test results show that increasing the fiber volume fraction improves flexural and tensile strength. Water curing increased compressive, tensile, and flexural strength. Lightweight fiber hybridization has no effect on compressive strength, whereas heavyweight fiber hybridization improves compressive strength. For tensile and flexural strength, hybridization was associated with an improvement in all mechanical properties. The hybridization of lightweight fiber achieved ECC behavior at a lower volume fraction than the use of a single fiber volume. Relationships between tensile strength and flexural strength depending on the compressive strength of ECC were driven by demonstrating high performance.
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Abd Al Kareem, S., and I. F. Ahmed. "Impact Resistance of Bendable Concrete Reinforced with Grids and Containing PVA Solution." Engineering, Technology & Applied Science Research 11, no. 5 (October 12, 2021): 7709–13. http://dx.doi.org/10.48084/etasr.4440.
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The development of new building materials, able of absorbing more energy is an active research area. Engineering Cementitious Composite (ECC) is a class of super-elastic fiber-reinforced cement composites characterized by high ductility and tight crack width control. The use of bendable concrete produced from Portland Limestone Cement (PLC) may lead to an interest in new concrete mixes. Impact results of bendable concrete reinforced with steel mesh and polymer fibers will provide data for the use of this concrete in areas subject to impact loading. The experimental part consisted of compressive strength and impact resistance tests along with a result comparison with unreinforced concrete. Concrete samples, with dimensions of 100×100×100mm (cubes), and 500×500×50mm (slabs), were poured and were treated at ages of 28, 56, and 90 days. The compressive strength increased by 36.11%, 45.5%, and 52.4% respectively, whereas the impact resistance for samples reinforced with steel mesh and polypropylene fibers gave superior results to the conventional mixes.
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Yao, Zhishu, Yu Fang, Ping Zhang, and Xianwen Huang. "Experimental Study on Durability of Hybrid Fiber-Reinforced Concrete in Deep Alluvium Frozen Shaft Lining." Crystals 11, no. 7 (June 23, 2021): 725. http://dx.doi.org/10.3390/cryst11070725.
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This article proposes hybrid fiber-reinforced concrete (HFRC) mixed with polyvinyl alcohol fiber (PVA) and polypropylene steel fiber (FST) as a wall construction material to improve the bearing capacity and durability of frozen shaft lining structures in deep alluvium. According to the stress characteristics and engineering environment of the frozen shaft lining, the strength, impermeability, freeze–thaw damage, and corrosion resistance are taken as the evaluation and control indexes. The C60 concrete commonly used in freezing shaft lining is selected as the reference group. Compared to the reference group, the test results show that the compressive strength of HFRC is similar to that of the reference concrete, but its splitting tensile strength and flexural strength are higher; according to the strength test, the optimum mixed content of 1.092 kg/m3 PVA and 5 kg/m3 FST are obtained. According to the impermeability test results, the mixing of PVA and FST can improve the impermeability resistance of concrete. For the freeze–thaw cycle test results, the mixing of PVA and FST can improve the frost resistance of concrete; based on the 120 days sulfate corrosion test, the mixing of PVA and FST will improve the corrosion resistance of concrete.
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Sprince, Andina, and Leonids Pakrastinsh. "Case Study on Early Age Shrinkage of Cement-based Composites." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 2 (August 8, 2015): 79. http://dx.doi.org/10.17770/etr2013vol2.863.
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The aim of this paper was to study the behaviour of new high-performance fibre-reinforced cement composite materials (FRCC) that are reinforced with polyvinyl alcohol (PVA) fibres. The shrinkage deformations at early age, the compressive strength and modulus of elasticity of the new compositions had been determined. Test results shows that the addition of PVA fiber 1.10% and 0.55% by weight of the cement has negligible influence on concrete drying shrinkage, however, it is affect the concrete plastic and autogenous shrinkage. The results of the experiments permitted the prediction of long-term deformations of the concrete. Wider use of this material permit the construction of sustainable next generation structures with thin walls and large spans that cannot be built using the traditional concrete.
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Jalal, Asif, Nasir Shafiq, Ehsan Nikbakht, Rabinder Kumar, and Muhammad Zahid. "Mechanical Properties of Hybrid Basalt-Polyvinyl Alcohol (PVA) Fiber Reinforced Concrete." Key Engineering Materials 744 (July 2017): 3–7. http://dx.doi.org/10.4028/www.scientific.net/kem.744.3.
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This study focuses on the study of the mechanical behavior of non-metallic hybrid Basalt-PVA fiber reinforced concrete. Total five mixes were investigated with one control plain concrete and four with fiber volume fraction of 0.3%, 0.6%, 0.9% and 1.2%. Basalt and PVA were used in same quantity. Fiber decreased workability, therefore superplasticizer was used to maintain workability constant. The increase in superplasticizer and fiber content decreased compression, split tensile and flexure strengths because of formation of big size pores. Whereas fiber enhanced the post peak load zone in the load-deflection curve. Fiber improved the bridging action by increasing energy absorption. Fiber vanished the brittle behavior of high strength concrete and increased first crack toughness, flexure toughness and also maximum deflection. 0.3% volume fraction of fiber was found to be optimum with the negligible decrease in compression, split tensile and flexure strength while caused the considerable increase in first crack toughness, flexure toughness, and maximum deflection.
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Chen, Yan. "Study on Hybrid Fiber Reinforced Lightweight Aggregate Concrete." Applied Mechanics and Materials 477-478 (December 2013): 949–52. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.949.
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For lightweight aggregate concrete, fiber materials can reinforce its toughness and strength better and improve its segregation degree greatly. Specifically, as the experiment indicates, the fluidity of concrete mix decreases slightly after 0.5% basalt fiber and 0.5% PVA fiber are incorporated into the concrete with FA ceramsite as lightweight aggregate. However, its segregation degree reduces about 50%. And its 28d cubic compressive strength increases 0.7% and 28d splitting tensile strength increases 12.7%. Therefore, this effect is better than that of adding only one kind of fiber.
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Li, Lianghui, Bixiong Li, Zhiwen Wang, Zhibo Zhang, and Othman Alselwi. "Effects of Hybrid PVA–Steel Fibers on the Mechanical Performance of High-Ductility Cementitious Composites." Buildings 12, no. 11 (November 10, 2022): 1934. http://dx.doi.org/10.3390/buildings12111934.
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Producing high-ductility cementitious composites (HDCC) increased in parallel with concrete demand in China recently. However, the high cost of manufacturing cementitious composites (HDCC) persists. To reduce the cost of HDCC, steel fibers, polyvinyl alcohol (PVA), and river sand were used to produce HDCC concrete in the present study. A total fiber content of 2% was formed with five different proportions of PVA fiber and steel fiber. Within the scope of the experimental studies, mechanical (workability, compressive strength, tensile, and bending properties), and microstructural (scanning electron microscopy) tests were carried out to investigate the properties of the hybrid fiber-reinforced composites. The results showed that the fluidity of HDCC increased with increasing steel fiber substitution. The compressive strength of the mixture containing 0.5% steel fiber and 1.5% PVA fiber exhibited a better compressive strength of 31.3 MPa. The tensile performance of the mixture was improved due to the incorporation of steel fiber. The initial cracking strength was about 2.32 MPa, 25.4% higher than that of the reference group, and the ultimate tensile strength was 3.36–3.56 MPa. However, reducing the content of PVA fiber impacts the flexural rigidity of the matrix.
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Dai, Jie, Xuesen Li, Yadi Zhao, and Yunfei Li. "Influence of Glazed Hollow Bead on the Performance of Polyvinyl Alcohol Fiber Reinforced Cement Composites." Crystals 12, no. 4 (March 24, 2022): 454. http://dx.doi.org/10.3390/cryst12040454.
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To improve the thermal insulation properties and toughness of concrete, the glazed hollow bead (GHB) and polyvinyl alcohol (PVA) fiber reinforced cementitious composites (GPCC) were investigated by orthogonal test, which includes six GHB mass percentage (20%, 40%, 60%, 80%,100%, 120%), three PVA volume fraction (1%, 1.5%, 2%) and water binder ratio (0.26, 0.30, 0.34). Compressive, split tensile strengths and thermal conductivity of GHB-PVA reinforced cementitious composites (GPCC) were tested, and the mechanism of fibers was analyzed from a microscopic perspective. The results revealed that the thermal insulation will be significantly improved with the increased content of GHB, but the compressive and split tensile strength will be decreased simultaneously. No obvious effect was found by the PVA fiber addition on its strength indexes, and the presence of GHB will affect the bridging action of PVA fibers. The water binder ratio has more effect on strengths than thermal conductivity. Based on the mechanical performance rather than the thermal insulation analysis test, the optimal mix proportions were proposed: mass percentage of 40% GHB, a volume fraction of 1.5% PVA fiber, and 0.26 water-binder ratio. Moreover, the anchoring and bridging effect of PVA fibers will effectively balance the stress generated by the shrinkage of cement paste, and inhibits or even prevents the development of cracks. However, a certain number of tiny cracks will be formed near the GHB, and between GHB and PVA fibers, which will cause local stretching and peeling of PVA, and shattering inside the GHB with the increase of external force. The findings of this study can provide a useful reference for the application of an insulated-bearing material with GHB and PVA fiber.
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Zheng, Wenbo, Sheliang Wang, Xiaoyi Quan, Yang Qu, Zhikai Mo, and Changjun Lin. "Carbonation Resistance and Pore Structure of Mixed-Fiber-Reinforced Concrete Containing Fine Aggregates of Iron Ore Tailings." Materials 15, no. 24 (December 16, 2022): 8992. http://dx.doi.org/10.3390/ma15248992.
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The disposal of industrial by-product tailings has become an important issue in solving environmental pollution. In this study, 15%, 30%, 50%, and 70% iron tailings were used to replace the natural sand in concrete, and 1.5% steel fiber and 0–0.75% PVA fibers were added to the iron tailings concrete. The effects of the iron tailings replacement rate and the fiber content on the mechanical properties, carbonization depth, and concrete porosity were studied in a carbonization environment. The results demonstrated that the compressive and splitting tensile strengths of concrete first increased and subsequently decreased with an increase in the iron tailings replacement rate, while the carbonation depth and porosity initially decreased and subsequently increased. When the replacement rate of iron tailings was 30%, the compressive strength and split tensile strength were increased by 7.6% and 17.7%, respectively, and the porosity was reduced by 8.9%. The compressive strength, carbonation depth and porosity of single-doped steel-fiber concrete were superior to those of ordinary iron tailings concrete. However, compared with single-doped steel fiber, the performance of steel-PVA fiber was further improved. Based on the mechanical properties, the carbonation depth test results of the three aforementioned types of concrete, the mathematical expression of the uniaxial compression stress–strain curve of iron tailings concrete, and the prediction equation of the carbonation depth of mixed-fiber iron tailings concrete were proposed. This study provides a reference for the application and popularization of fiber-reinforced iron tailings concrete in carbonization environments.
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Choi, Yun Cheol. "Bond Characteristics between ECC (Engineered Cementitious Composites) and GFRP Rebars." Advanced Materials Research 602-604 (December 2012): 1010–13. http://dx.doi.org/10.4028/www.scientific.net/amr.602-604.1010.
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The purpose of this study is to investigate the bond characteristics between ECC(Engineered Cementitious Composites) and GFRP(Glass Fiber Reinforced Polymers) rebars. An experimental study was carried out to investigate the bond-slip properties of the steel and GFRP rebars in ECC which was reinforced with Polyvinyl Alcohol(PVA) fibers. A total of 8 beam specimens, which was designed according to the RILEM guidelines, was tested according to the RILEM guideline. The main objective was evaluating the load versus displacement and load versus slip behavior and the bond strength regarding the influence of the following parameters : concrete type(Normal concrete and fiber reinforced concrete) and bar diameter and type. From the test results, concrete and ECC specimen presented similar behavior for steel reinforced specimen. However, GFRPO reinforced specimen show different behavior with that. Comparative study for test and equations of MC90 was carried out and code provision predicted the bond characteristics conservatively.
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Nikhil, Guntupally, K. Hemalatha, V. Mallikarjuna Reddy, and V. Swamy Nadh. "Flexural behaviour of hybrid fiber reinforced concrete beamusing BFRP bars." E3S Web of Conferences 309 (2021): 01179. http://dx.doi.org/10.1051/e3sconf/202130901179.
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The corrosion of rebar is one of the main problem in the construction industry. A lot of amount is spent on the repair work every year but none of them is that effective. Therefore, the recent studies are being conducting on the FRP rebar due to the brittle nature and the bonding performance. We have also used PVA fiber in concrete to increase the strength of the concrete. we are using Hybrid beams in which we have replaced the corner rebar with BFRP bars because of their superior corrosion effect and the strength to weight ratio. We used four point loading test on these hybrid reinforced beams to find the flexural behaviour by which we can predict the performance. 0.25% PVA fiber reinforced concrete showed the optimum results.
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Safaei, Shouresh. "E-glass Coated Fibers in Novel Composite System for Constructional Applications." International Journal of Science and Engineering Applications 10, no. 8 (August 2021): 111–13. http://dx.doi.org/10.7753/ijsea1008.1002.
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Concrete is one of the most applicable materials in construction. But it needs to reinforce with several reinforcement materials especially high performance fibers such as glass fibers to improve its properties. Among glass fibers, E-glass fiber has lower price but degrade in alkaline cementitious matrix. In this investigation for prohibition of E-glass fibers degradation along with better adhesion of E-glass fibers to cementitious matrix a doubled layer composite coating has been used. The first layer is a polysiloxane which it's permeability to water is too low so prevent alkali attack on E-glass fiber. The second layer is polyvinyl acetate (PVAC) having polar groups of acetate, produce calcium acetate in cementitious matrix, which stick firmly to cement. PVAC in alkaline solution can produce polyvinyl alcohol (PVA) which is again sticky to cement. This composite coating applied on E-glass fibers and used to reinforce concrete. The durability of coated fibers was investigated by alkaline stability test and SEM images. Meanwhile for studying adhesion of fibers to concrete pull out characteristics of coated fibers been investigated and compared with bare E-glass reinforced concrete.
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Yew, Ming Kun, Hilmi Bin Mahmud, Bee Chin Ang, and Ming Chian Yew. "Effects of Low Volume Fraction of Polyvinyl Alcohol Fibers on the Mechanical Properties of Oil Palm Shell Lightweight Concrete." Advances in Materials Science and Engineering 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/425236.
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This paper presents the effects of low volume fraction(Vf)of polyvinyl alcohol (PVA) fibers on the mechanical properties of oil palm shell (OPS) high strength lightweight concrete mixtures. The slump, density, compressive strength, splitting tensile strength, flexural strength, and modulus of elasticity under various curing conditions have been measured and evaluated. The results indicate that an increase in PVA fibers decreases the workability of the concrete and decreases the density slightly. The 28-day compressive strength of oil palm shell fiber-reinforced concrete (OPSFRC) high strength lightweight concrete (HSLWC) subject to continuous moist curing was within the range of 43–49 MPa. The average modulus of elasticity (E) value is found to be 16.1 GPa for all mixes, which is higher than that reported in previous studies and is within the range of normal weight concrete. Hence, the findings of this study revealed that the PVA fibers can be used as an alternative material to enhance the properties of OPS HSLWC for building and construction applications.
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Hong, Li, Tadan Li, Yadi Chen, Peng Gao, and Lizhi Sun. "Characteristics of Interfacial Shear Bonding Between Basalt Fiber and Mortar Matrix." Materials 13, no. 21 (November 9, 2020): 5037. http://dx.doi.org/10.3390/ma13215037.
Full textAbstract:
Basalt fibers have been adopted as reinforcements to improve mechanical performance of concrete materials and structures due to their excellent corrosion resistance, affordable cost, and environmental-friendly nature. While the reinforcing efficiency is significantly dependent on fiber–matrix interfacial properties, there is a lack of studies focusing on the bonding behavior of basalt fibers in the mortar matrix. In this paper, a series of experiments were carried out to investigate the characteristics of single basalt fiber pulled out from the mortar matrix. Three embedment lengths and three types of mortar strength were considered. As references, the pull-out behavior of single polyvinyl alcohol (PVA) fiber and glass fiber in mortar matrix were also tested for comparison. Results from the pull-out test revealed that the average bonding strength is more effective than the equivalent shear bonding strength to illustrate the interfacial bond behavior of single basalt fiber in mortar matrix, which can be improved by either longer embedment length or the stronger mortar matrix. Finally, the tensile and compressive strengths of basalt/PVA/glass fiber-reinforced concrete (FRC) were measured to investigate the influence of interfacial shear bonding strengths. It was shown that, while PVA fiber developed the highest shear bonding strength with mortar, the basalt fiber exhibited the best reinforcing efficiency of FRC.
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Xu, Bo, Houssam A. Toutanji, Thomas Lavin, and John A. Gilbert. "Characterization of Poly(vinyl Alcohol) Fiber Reinforced Organic Aggregate Cementitious Materials." Key Engineering Materials 466 (January 2011): 73–83. http://dx.doi.org/10.4028/www.scientific.net/kem.466.73.
Full textAbstract:
This study focuses on the development of a lightweight, high-performance cementitious composite material reinforced with Poly(vinyl alcohol) (PVA) fiber. The material which contains Poly(vinyl butyral) (PVB) as the sole aggregate has a low average density of 1548 kg/m3 and a compressive strength of about 40 MPa. The flexural strength, impact resistance, and fracture toughness are also evaluated and are found to be improved in comparison to those of lightweight concrete. The addition of PVA fiber further improves ductility, fracture toughness and impact resistance. The increase in fracture toughness was found to be linear with increasing fiber volume fraction. Comparisons are made with a lightweight concrete of equal density, and a normal-weight concrete. A model based on fiber bridging mechanics and the rule of mixtures is developed to characterize the fracture toughness, and a good correlation is obtained for the materials tested when experimental results are compared to those predicted by the model.