Articoli di riviste: "Reinforced concrete Fiber"

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Jagtap, Siddhant Millind, Shailesh Kalidas Rathod, Rohit Umesh Jadhav, Prathamesh Nitin Patil, Atharva Shashikant Patil, Ashwini M. Kadam e P. G. Chavan. "Fibre Mesh in Reinforced Slabs". International Journal for Research in Applied Science and Engineering Technology 10, n. 5 (31 maggio 2022): 3539–40. http://dx.doi.org/10.22214/ijraset.2022.42986.

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Abstract: Fiber Reinforced Concrete is gaining attention as an effective way to improve the performance of concrete. Fibers are currently being specified in tunneling, bridge decks, pavements, loading docks, thin unbonded overlays, concrete pads, and concretes slabs. These applications of fiber reinforced concrete are becoming increasingly popular and are exhibiting excellent performance The usefulness of fiber reinforced concrete in various civil engineering applications is indisputable. Fiber reinforced concrete has so far been successfully used in slabs on grade, architectural panels, precast products, offshore structures, structures in seismic regions, thin and thick repairs, crash barriers, footings, hydraulic structures and many other applications. This study presents understanding srength of fibre reinforced conceret. Mechanical properties and durability of fiber reinforced concrete.

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Krishnan, Arsha, e V. N. Krishnachandran. "Coir Fiber Reinforced Concrete-Review". International Journal for Research in Applied Science and Engineering Technology 10, n. 9 (30 settembre 2022): 568–71. http://dx.doi.org/10.22214/ijraset.2022.46677.

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Abstract: As a practical means of enhancing concrete's performance, fiber reinforced concrete (FRC) is gaining popularity. It is crucial to find acceptable, low-cost building and reinforcing methods that work for emerging nations. Utilizing natural fibers may drastically reduce the cost of construction. Prior research in the literature indicates that using coir fibers in concrete improves concrete strength. However, information about the use of coir fiber in concrete is scattered. This report presents a detailed analysisto highlight the usage of coconut fibers as reinforcing material in recent years.

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Yang, Qiao-chu, Qin Zhang, Su-su Gong e San-ya Li. "Study on the flexure performance of fine concrete sheets reinforced with textile and short fiber composites". MATEC Web of Conferences 275 (2019): 02006. http://dx.doi.org/10.1051/matecconf/201927502006.

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In order to study the influences of the contents of short fiber on the mechanical properties of concrete matrix, the properties of compressive, flexure and splitting of concrete matrix reinforced by alkali resistant glass fiber and calcium carbonate whisker were tested. To study the reinforced effect of different scale fibers on the flexure behavior of fine concrete sheets, the flexural tests of concrete sheet of fine concrete reinforced with basalt fiber mesh and short fiber composites were carried out. The results show that the properties of the compressive, flexure and splitting of fine concrete reinforced with appropriate amount of alkali resistant glass fiber and carbonate whisker are improved compared with that of concrete reinforced by one type of fiber. The flexure properties of the concrete sheets are improved obviously when continuous fiber textile and short fiber composite are adopted to reinforce.

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Hua, Yuan, e Tai Quan Zhou. "Experimental Study of the Mechanical Properties of Hybrid Fiber Reinforced Concrete". Materials Science Forum 610-613 (gennaio 2009): 69–75. http://dx.doi.org/10.4028/www.scientific.net/msf.610-613.69.

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Different kinds of fiber are used to reinforce the concrete to improve the concrete mechanical properties. The high modulus and high flexibility fibers are often used to reinforce in the cement base, which leads to the higher performance compound cement based materials. In the paper, the carbon fiber and glass fiber material are used as flexibility reinforced materials. The polypropylene fiber and the polyethylene fiber are used as strength reinforced materials. The combinations of the flexibility reinforced fiber and strength reinforced fiber are chosen as C-P HF (Carbon and Polypropylene Hybrid Fiber) and G-Pe HF (Glass and Polyethylene Hybrid Fiber). The concrete mixture ratio and the fiber-reinforced amount are determined to the author’s previous study. The relationship between compressive strength, flexural strength and length/diameter aspect ratio of fiber for the carbon and polypropylene hybrid fiber reinforced concrete (C-P HFRC), and for the glass and polyethylene hybrid fiber reinforced concrete (G--Pe HFRC) was tested and discussed. The testing results show that length/diameter aspect ratio of fiber obviously affects the flexural strength of C-P HFRC and G-Pe HFRC, though the compressive strength is slightly affected by the length-diameter aspect ratio.

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Bhoi, Ghanshyam, Vinay Pate e Mahesh Ram Patel. "Study on the Effect of Glass Fibre Reinforced Concrete and Concrete Tiles Reinforced Concrete". International Journal for Research in Applied Science and Engineering Technology 10, n. 5 (31 maggio 2022): 2564–69. http://dx.doi.org/10.22214/ijraset.2022.42753.

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Abstract: The objective of this research is to explore the compressive strength, split-tensile strength and flexural strength properties of concrete reinforced with short discrete fibers. The study will be carried out on M-20 grade concrete and the size of glass fibers will be used 30mm and variation of fibre will be 0% to 0.3% of the total weight of concrete. also the effect of glass fiber on cement and concrete tiles will be studied whose fibre content will be varied from 0% to 0.7% of the total weight of concrete. Keywords: GFRC, Concrete tiles, Cement Matrix, MORTH

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Shan, Liang, e Liang Zhang. "Experimental Study on Mechanical Properties of Steel and Polypropylene Fiber-Reinforced Concrete". Applied Mechanics and Materials 584-586 (luglio 2014): 1355–61. http://dx.doi.org/10.4028/www.scientific.net/amm.584-586.1355.

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The mechanical tests of normal concrete (NC) specimens, steel fiber reinforced concrete (SFRC) specimens and polypropylene fiber reinforced concrete (PPFRC) specimens have been carried out. Fiber-reinforced concretes containing different volume fraction and aspect ratio of steel and polypropylene fibers were compared in terms of compressive, splitting tensile, ultimate tensile properties. Test results indicate that the mechanical properties of NC can be improved by addition of steel fibers and can be enhanced with the increase of fiber content. However, polypropylene fiber may cause opposite effect, if volume fraction too high.

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Berestianskaya, Svitlana, Evgeniy Galagurya, Olena Opanasenko, Anastasiia Berestianskaya e Ihor Bychenok. "Experimental Studies of Fiber-Reinforced Concrete Prisms Exposed to High Temperatures". Key Engineering Materials 864 (settembre 2020): 3–8. http://dx.doi.org/10.4028/www.scientific.net/kem.864.3.

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Fiber-reinforced concretes are varieties of composite materials. Such materials are commonly used nowadays. Concrete is fiber-reinforced using various fibrous materials, or fibers, which are evenly distributed over the volume of the concrete matrix and simultaneously provide its 3D reinforcement. Fiber-reinforced concrete has better stress-related strength characteristics than ordinary concrete. Since building structures must meet both the strength, rigidity and stability requirements, and the fire safety requirements, then for the extensive use of fiber-reinforced concrete structures, not only the external load design, but also temperature effect design should be conducted in the design phase. The strength and strain characteristics of fiber concrete exposed to high temperatures must be known for this purpose. In view of this, three series of prisms were manufactured and tested: the first series contained no fiber at all (control prisms), the second series contained basalt fiber, and the third series contained steel fiber. The test results showed that adding fibers improves the mechanical characteristics of fiber-reinforced concrete samples under specified conditions.

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Chaichannawatik, Bhawat, Athasit Sirisonthi, Qudeer Hussain e Panuwat Joyklad. "Mechanical Properties of Fiber Reinforced Concrete". Applied Mechanics and Materials 875 (gennaio 2018): 174–78. http://dx.doi.org/10.4028/www.scientific.net/amm.875.174.

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This study presents results of an experimental investigation conducted to investigate the mechanical properties of sisal and glass fiber reinforced concrete. Four basic concrete mixes were considered: 1) Plain concrete (PC) containing ordinary natural aggregates without any fibers, 2) sisal fiber reinforced concrete (SFRC), 3) sisal and glass fiber reinforced concrete (SGFRC), 4, glass fiber reinforced concrete (GFRC). Investigated properties were compressive strength, splitting tensile strength, flexural tensile strength and workability. The results of fiber reinforced concrete mixes were compared with plain concrete to investigate the effect of fibers on the mechanical properties of fiber reinforced concrete. It was determined that addition of different kinds of fibers (natural and synthetic) is very useful to produce concrete. The addition of fibers was resulted into higher compressive strength, splitting and tensile strength. However, the workability of the fiber reinforced concrete was found lower than the plain concrete due to the addition of fibers in the concrete.

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Fedorov, Valeriy, e Aleksey Mestnikov. "Influence of cellulose fibers on structure and properties of fiber reinforced foam concrete". MATEC Web of Conferences 143 (2018): 02008. http://dx.doi.org/10.1051/matecconf/201814302008.

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One of the promising means of foamed concrete quality improvement is micro-reinforcement by adding synthetic and mineral fibers to the base mix. This research is the first to investigate peculiarities of using recycled cellulose fiber extracted from waste paper for obtaining fiber reinforced foam concrete. The paper presents results of experimental research on the influence of cellulose fibers on structure and properties of fiber reinforced foam concrete by using methods of chemical analysis and scanning electron microscopy. The research determines peculiarities of new formations appearance and densification of binder hydration products in the contact zone between fiber and cement matrix, which boost mechanical strength of fiber reinforced foam concrete. Physico-mechanical properties of fiber reinforced foam concrete were defined depending on the amount of recycled cellulose fiber added to the base mix. It was found that the use of recycled cellulose fibers allows obtaining structural thermal insulating fiber reinforced foam concretes of non-autoclaved hardening of brand D600 with regard to mean density with the following improved properties: compressive strength increased by 35% compared to basic samples, higher stability of foamed concrete mix and decreased shrinkage deformation.

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Syamsir, A., S. M. Mubin, N. M. Nor, V. Anggraini, S. Nagappan, A. M. Sofan e Z. C. Muda. "Effect of combined drink cans and steel fibers on the impact resistance and mechanical properties of concrete". Journal of Mechanical Engineering and Sciences 14, n. 2 (22 giugno 2020): 6734–42. http://dx.doi.org/10.15282/jmes.14.2.2020.15.0527.

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This study investigated the combine effect of 0.2 % drink cans and steel fibers with volume fractions of 0%, 0.5%, 1%, 1.5%, 2%, 2.5% and 3% to the mechanical properties and impact resistance of concrete. Hooked-end steel fiber with 30 mm and 0.75 mm length and diameter, respectively was selected for this study. The drinks cans fiber were twisted manually in order to increase friction between fiber and concrete. The results of the experiment showed that the combination of steel fibers and drink cans fibers improved the strength performance of concrete, especially the compressive strength, flexural strength and indirect tensile strength. The results of the experiment showed that the combination of steel fibers and drink cans fibers improved the compressive strength, flexural strength and indirect tensile strength by 2.3, 7, and 2 times as compare to batch 1, respectively. Moreover, the impact resistance of fiber reinforced concrete has increase by 7 times as compared to non-fiber concretes. Moreover, the impact resistance of fiber reinforced concrete consistently gave better results as compared to non-fiber concretes. The fiber reinforced concrete turned more ductile as the dosage of fibers was increased and ductility started to decrease slightly after optimum fiber dosage was reached. It was found that concrete with combination of 2% steel and 0.2% drink cans fibers showed the highest compressive, split tensile, flexural as well as impact strength.

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Liu, Chuan Xiao, Zhi Hao Liu, Long Wang, Hong Ye Tian e Xiu Li Zhang. "Index Analysis for Specimens of Reinforced Concretes with Mechanical Parameters". Advanced Materials Research 368-373 (ottobre 2011): 33–37. http://dx.doi.org/10.4028/www.scientific.net/amr.368-373.33.

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To study mechanical characteristics of general reinforced concrete in engineering, specimens of reinforced concrete with different mass ratios and specimens of fiber reinforced concrete with different distributing modes of steel fibers or mixed modes of fiberglass are produced. Testing results from these specimens state that recommended mass ratio is 1:4.29:0.74 of cement, sand to water for reinforced concrete, and mass ratio of mixed AR fiberglass is 4‰ or distributing mode of steel fibers is vertical 5 roots evenly for fiber reinforced concretes will have excellent mechanical properties. Analyzing mechanical indexes influencing characteristics of reinforced concretes, uniaxial compressive strength and ultimate strain are primary indexes, elastic modulus is an assistant index, and Poisson ratio and residual strength are both only referenced indexes.

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Gadgihalli, Vishal, Meena, Sindu e Raghavendra Prasad Dinakar. "ANALYSIS OF PROPERTIES OF CONCRETE USING STEEL FIBERS AS FIBER REINFORCEMENT ADMIXTURE". International Journal of Research -GRANTHAALAYAH 5, n. 4RASM (30 aprile 2017): 59–62. http://dx.doi.org/10.29121/granthaalayah.v5.i4rasm.2017.3370.

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Fiber reinforced concrete is composite material consisting of mixtures of cement, mortar or concrete, discontinuous discrete uniform dispersed suitable fibers. Fiber reinforced concrete are of different types and properties. In this paper analysis of properties of concrete using steel fibre as fiber reinforcement admixture is studied and verified the strength of concrete to normal plane concrete with absence of admixtures. Using steel fibers as fiber reinforcement admixture increases bond strength by enhancing surface tension as steel is better in taking flexural strength this gives better results, hence we can use this steel fiber reinforcement to concrete where the compressive and flexural strength place a crucial role in construction and maintenance.

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Mailyan, Levon, Petr Shilov e Aleksandr Shilov. "MECHANICAL TECHNOLOGY OF CREATING PLATED FIBER-REINFORCED AND FIBER-REINFORCED CONCRETE ELEMENTS WITH DIRECTIONAL ORIENTATION OF FIBER IN TWO DIRECTIONS". Construction and Architecture 10, n. 2 (27 giugno 2022): 6–10. http://dx.doi.org/10.29039/2308-0191-2022-10-2-6-10.

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A modified mobile installation has been developed for creating slab fiber-reinforced concrete and fiber-reinforced concrete elements with a directional orientation of the fibers in two directions according to the proposed mechanical technology. The presented mechanical technology for creating slab fiber-reinforced concrete and fiber-reinforced concrete elements will make it possible to provide a mutually perpendicular orientation of the fibers in various layers of the structure, which will allow for the most complete inclusion of each fiber fiber into the work of the element. Also, due to the use of a mobile installation for laying fiber-reinforced concrete mix, specially designed and modified to work with slab elements, a uniform distribution of fibers in the body of concrete will be mechanically ensured.

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Chen, Yung Tsang. "An Experimental Study on the use of Fiber-Reinforced Concrete in Bridge Approach Slabs". Applied Mechanics and Materials 361-363 (agosto 2013): 1217–22. http://dx.doi.org/10.4028/www.scientific.net/amm.361-363.1217.

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Fiber-reinforced concrete is well known for crack control by bridging cracks in the concrete. Short, discontinuous fibers are added into plain concrete to provide post-cracking ductility to the fiber-reinforced concrete. Although fiber-reinforced concrete has been used in various civil engineering applications, the practical application of fiber-reinforced concrete in bridge approach slabs is rarely found. In this paper, steel fibers, serving as macro-fibers, and polyvinyl alcohol fibers, serving as micro-fibers, were added to the approach slab concrete for crack control purpose. This paper describes flexural tests of four fiber-reinforced concrete beams and loading test of a full scale fiber-reinforced concrete approach slab. Results from the flexural beam test show that the addition of fibers greatly improves the fracture toughness of the concrete. Results from the loading test show that the overall performance of the slab is comparable to conventional reinforced concrete approach slabs, and the surface cracks on the slab due to negative moment can be adequately controlled by the addition of steel and polyvinyl alcohol fibers into concrete, even without top reinforcement mat.

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Lukashevich, Viktor, Igor Efanov, Viktor Vlasov e Olga Lukashevich. "Asphalt concrete pavement reinforced with chemical fibers". MATEC Web of Conferences 216 (2018): 01013. http://dx.doi.org/10.1051/matecconf/201821601013.

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Asphalt concrete pavement which is currently built in accordance with the existing requirements does not withstand the standard service life. Various kinds of damages occur. Fiber reinforcement of asphalt concretes is one of the effective means to deal with deformations and fractures of road pavements, such as rutting, buckling, crack formation and shear. Chemical fibers serving as reinforcement are of great concern herein. The major purpose of this work was evaluation of reinforcement fibers resistance to natural environment and climatic impacts within the conditions of experimental production construction and studying compactibility of asphalt concrete mixture with fiber reinforcement. Infrared spectroscopy and physical-chemical investigations of fibers were used to study changing properties of fiber-forming polymer. Compactibility of asphalt concrete mixture with fiber reinforcement was determined upon compaction factor. Research results revealed insignificant influence of natural environment and climatic impacts on the properties of fiber reinforcement material. In order to obtain the standard compaction factor of asphalt concrete additional compacting impact is not required.

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Tanveer Majid, Muhammad. "The effect of twisted polymer fibers on the physical and mechanical properties of C35 concrete". Journal of Research in Science, Engineering and Technology 7, n. 4 (29 settembre 2020): 11–15. http://dx.doi.org/10.24200/jrset.vol7iss4pp11-15.

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Concrete as the most used material, is known as an integral part of construction. So far, many studies have been done in the field of improving the quality of concrete that most of them have examined change in concrete mix design; however, the use of additives and also replacing commonly used materials in concrete with new materials always has been considered. Today, different fibers, especially Forta fibers, are used. In this study, experiments on Forta fiber- reinforced concrete are described. The concrete mixing design and Forta fiber properties are also briefly described. The comparison between the results of the tests showed that Forta fiber- reinforced concretes have more bending strength and modulus of elasticity than normal and ordinary concretes.

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Purba, Burt K., e Aftab A. Mufti. "Investigation of the behavior of circular concrete columns reinforced with carbon fiber reinforced polymer (CFRP) jackets". Canadian Journal of Civil Engineering 26, n. 5 (1 ottobre 1999): 590–96. http://dx.doi.org/10.1139/l99-022.

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Recent advancements in the fields of fiber reinforced polymers (FRPs) have resulted in the development of new materials with great potential for applications in civil engineering structures, and due to extensive research over recent years, FRPs are now being considered for the design of new structures. This study describes how carbon fiber reinforced polymer jackets can be used to reinforce circular concrete columns. Fibers aligned in the circumferential direction provide axial and shear strength to the concrete, while fibers aligned in the longitudinal direction provide flexural reinforcement. Prefabricated FRP jackets or tubes would also provide the formwork for the columns, resulting in a decrease in labor and materials required for construction. Also, the enhanced behavior of FRP jacketed concrete columns could allow the use of smaller sections than would be required for conventionally reinforced concrete columns. Furthermore, FRP jacket reinforced concrete columns would be more durable than conventionally reinforced concrete columns and therefore would require less maintenance and have longer service life.Key words: bridge, carbon, column, concrete, confinement, fiber reinforced polymer, jacket, retrofitting, seismic, strengthening.

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Kumar,, Ravikant, e Rahul Sharma. "A Comparative Study of the Use of Concrete Mix Using Jute Fibers". International Journal for Research in Applied Science and Engineering Technology 10, n. 5 (31 maggio 2022): 511–15. http://dx.doi.org/10.22214/ijraset.2022.42207.

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Abstract: The character of fiber reinforced concrete can be changed by the variation of certain factors. these factors are the geometric configuration of fibers, type and. quantity of fibers, , dispersal, direction, and concentration of the fibres Portland cement concrete is assumed to be a relatively. Brittle material .When non-reinforced concrete is exposed to tensile stresses. This is likely to fracture and fail. Since the start of the nineteenth century, studies were conducted. to reinforce concrete by using fibres. After the reinforcement of concrete by fibers, it becomes a composite group in which the fibres endures the tensile stresses. When concrete is reinforced by. using fiber in the mixture, it further increases the tensile strength of the composite system. Research has revealed that. The strength of concrete may be improved greatly by the adding of fibers Keywords: Fiber, jute fibres, NDT Mix design, design mix

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Anandan, Sivakumar, e Majed Alsubih. "Mechanical Strength Characterization of Plastic Fiber Reinforced Cement Concrete Composites". Applied Sciences 11, n. 2 (18 gennaio 2021): 852. http://dx.doi.org/10.3390/app11020852.

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The reinforcing efficiency of plastic fibers obtained from shredded plastic waste was tested in plain concrete mixes and experimentally verified in this study. Plastic fibers up to 0.15% Vf were added to the design concrete mix to assess the fiber effectiveness in terms of improved load carrying capability of various plastic fiber incorporated concrete composites. The effects of plastic fibers distributed homogenously in the entire depth of concrete and confined in the tension zone were evaluated in flexural bending properties. Mechanical strength properties were evaluated for two different types of concrete containing (i) plastic fibers added homogenously throughout the entire depth of concrete and (ii) the plastic fibers confined in the tension zone only. Flexural bending parameters such as toughness, residual strength, crack width, post-peak drop load resistance, and fiber performance index of various plastic fiber substituted concrete mixes were tested in compressive and flexural bending to assess the fiber reinforcing efficiency. Test results indicated that the plastic fibers added in tension zone confinement exhibited higher flexural strength (5.26 N/mm2) improvements compared to homogeneously distributed concrete systems. Flexural bending characteristics in terms of absolute toughness and post peak strain softening were found to be appreciably higher (132%) in tension zone confined plastic fiber concretes compared to homogeneous fiber concrete systems.

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Lee, Ming-Gin, Wei-Chien Wang, Yung-Chih Wang, Yi-Cheng Hsieh e Yung-Chih Lin. "Mechanical Properties of High-Strength Pervious Concrete with Steel Fiber or Glass Fiber". Buildings 12, n. 5 (7 maggio 2022): 620. http://dx.doi.org/10.3390/buildings12050620.

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Pervious concrete (also called porous concrete) is one of the most promising sustainable and green building materials today. This study examined high-strength pervious concrete and ordinary-strength pervious concrete reinforced with steel fiber or glass fiber. A total of fifteen mixtures of normal- and high-strength pervious concretes with steel fiber or glass fiber were used. The goal of high-strength pervious concrete is that the 28-day compressive strength be above 42 MPa and the porosity be as close to 15% as possible to achieve technical specifications. Both normal- and high-strength pervious concretes reinforced with steel fiber (1%, 2%) or glass fiber (0.25%, 0.5%) were investigated in water permeability, porosity, compressive strength, flexural strength, elastic modulus, and toughness tests. The test results show that in both high-strength pervious concrete and ordinary pervious concrete with steel fibers added, the porosity and permeability coefficient are increased compared with the control group. The coefficient of permeability for high-strength, fiber-reinforced pervious concretes with two aggregate sizes meets the requirements of the ACI specification for structural concrete. In addition, the high-strength pervious concrete specimen H1-S2 (2% steel fiber) has the highest compressive strength of 52.8 MPa at the age of 28 days. The flexural strength of pervious concrete also increases with age. However, the flexural strength of fiber-reinforced pervious concrete did not follow this trend due to the large variation in the quality control of different fiber mixtures. However, both steel fiber and glass fiber have a certain degree of improvement in the flexural toughness, and the effect is better with steel fiber. After the flexural strength reaches the peak value, there is still about 30% of the bearing capacity, and it gradually decreases until it is completely destroyed.

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Shan, Liang, Liang Zhang e Li Hua Xu. "Experimental Investigations on Mechanical Properties of Hybrid Steel-Polypropylene Fiber-Reinforced Concrete". Applied Mechanics and Materials 638-640 (settembre 2014): 1550–55. http://dx.doi.org/10.4028/www.scientific.net/amm.638-640.1550.

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The mechanical tests of hybrid steel-polypropylene fiber-reinforced concrete (HSPFRC) have been carried out. Concretes containing different volume fraction and aspect ratio of steel and polypropylene fibers mixed in one concrete grade were critically analyzed in terms of compressive, split tensile, axial tensile properties. Test results show that the fibers, when used in a hybrid form, can result in superior mechanical performance compared to their individual fiber-reinforced concretes.

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Klyuev, Sergey V., Tolya A. Khezhev, Yu V. Pukharenko e A. V. Klyuev. "The Fiber-Reinforced Concrete Constructions Experimental Research". Materials Science Forum 931 (settembre 2018): 598–602. http://dx.doi.org/10.4028/www.scientific.net/msf.931.598.

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The article proves the efficiency of the construction-based use of fibre concrete. The technique of high-quality fine-grained fibre concrete creation is presented. The chemical composition of the binder was studied and the physical and mechanical characteristics of the filler were revealed. 2 types of steel fibers were studied: anchor and in the form of a fir-tree. The conducted studies proved the effectiveness of dispersed reinforcement with steel fiber. It is established, that the usage of fiber in the form of a fir-tree the greatest increase of operational characteristics is reached.

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Ziane, Sami, Mohammed-Rissel Khelifa, Samy Mezhoud, Ahmed Beroual e Saber Medaoud. "Experimental Study on the Durability Characteristics of Several Vegetable Fiber Reinforced Concretes Exposed to Sodium Sulfate". Civil and Environmental Engineering Reports 31, n. 1 (1 marzo 2021): 1–28. http://dx.doi.org/10.2478/ceer-2021-0001.

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Abstract Recently, numerous plant fibers have been investigated as a means to reinforce concrete and replace synthetic fibers, thereby producing more eco-friendly concretes. The primary concern for these studies is the durability of the fibers in the external environment. For this purpose, the current paper presents a comparison study on the physical-mechanical behavior and durability against external sulfatic attack on Alfa and Hemp fiber-reinforced concrete. To assess the effects of sulfatic attack, different types of concrete underwent two aging protocols: 1) a complete immersion in 12.5 % Sodium Sulfate (Na2SO4) solution and, 2) an accelerated aging protocol which consisted of immersion/drying in the same sulfate solution at a temperature of 60°C. The results show that the optimal amount of plant fiber is variable, depending on several parameters such as the chemical composition, mechanical characteristics, and morphology of the fiber. In addition, the results show that the use of Alfa and hemp fibers could facilitate the production of green and durable structural concretes.

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Deng, Wen Qin, e Jing Zhao. "Structure Characteristics and Mechanical Properties of Fiber Reinforced Concrete". Advanced Materials Research 168-170 (dicembre 2010): 1556–60. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1556.

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Mechanical properties of fiber reinforced concrete with polypropylene fiber, alkali-resistant glass fiber and basalt fiber separately were studied in this paper. The internal structure of fiber reinforced concrete was researched by testing chloride ion diffusion coefficient and scanning electron microscope (SEM) analysis. The results show that adding a certain amount of three fibers separately into concrete have all increased splitting strength. Compared with referenced concrete, compressive strength of alkali-resistant glass fiber reinforced concrete and basalt fiber reinforced concrete are both improved. According to analysis, the effect of srengthening and toughening for basalt fiber is particularly significant. The order of chloride ion diffusion coefficient from lower to higher is alkali-resistant glass fiber reinforced concrete, referenced concrete, basalt fiber reinforced concrete, polypropylene fiber reinforced concrete. This result indicates that alkali-resistant glass fiber bonds cement paste best and makes internal structure densest by SEM analysis.

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Zhang, Bing, Xia-Min Hu, Qing Zhao, Tao Huang, Ning-Yuan Zhang e Qian-Biao Zhang. "Effect of fiber angles on normal- and high-strength concrete-filled fiber-reinforced polymer tubes under monotonic axial compression". Advances in Structural Engineering 23, n. 5 (10 novembre 2019): 924–40. http://dx.doi.org/10.1177/1369433219886082.

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Concrete-filled fiber-reinforced polymer tubes are a novel form of composite columns, which are particularly attractive for structural members in harsh environments and seismic regions due to their corrosion resistance and ductile behavior. Over the past two decades, many studies have been conducted on concrete-filled fiber-reinforced polymer tubes under axial compression, and many stress–strain models have been proposed. However, existing studies mainly focused on concrete-filled fiber-reinforced polymer tubes with only hoop fibers. In order to investigate the effect of fiber angles (i.e. the fiber angle between the fiber orientation and the longitudinal axis of fiber-reinforced polymer tube), this study conducted axial compression tests of 42 concrete-filled fiber-reinforced polymer tubes with ±80°, ±60°, or ±45° fiber angles. These concrete-filled fiber-reinforced polymer tubes were constructed using normal-strength concrete or high-strength concrete. Fiber-reinforced polymer tube thickness was also investigated as an important parameter. In order to clarify the effect of fiber angles on the properties of fiber-reinforced polymer tubes, axial compression tests on 15 short fiber-reinforced polymer tubes and tensile split-disk tests on 75 fiber-reinforced polymer rings were conducted. Experimental results indicate that fiber angles had significant influences on the hoop properties of fiber-reinforced polymer tube; the confinement effect of fiber-reinforced polymer tube and the peak stress of the confined concrete decreased with the decrease of the absolute value of fiber angles, while the ultimate strain of the confined concrete increased with the decrease of the absolute value of fiber angles. Two existing stress–strain models, which were developed mainly on test results of concrete confined by fiber-reinforced polymer tubes with only hoop fibers, are capable of providing reasonably accurate predictions for concrete-filled fiber-reinforced polymer tubes with ±80° and ±60° fiber angles, but it underestimates the ultimate axial strain of concrete-filled fiber-reinforced polymer tubes with ±45° fiber angles.

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Balaguru, P., e Anil Khajuria. "Properties of Polymeric Fiber-Reinforced Concrete". Transportation Research Record: Journal of the Transportation Research Board 1532, n. 1 (gennaio 1996): 27–35. http://dx.doi.org/10.1177/0361198196153200105.

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The mechanical properties of lightweight and normal concrete containing nylon polymeric fibers are presented. Fiber reinforced concrete made with nylon fibers was evaluated. The 19-mm-long fibers were in single filament form. The control concrete was designed for a compressive strength of 20 MPa. The primary independent variable was fiber volume fraction. The response variables were air content, unit weight of fresh concrete, compressive strength, modulus of rupture (flexural strength) and toughness, splitting tensile strength, and impact strength. The addition of fibers decreased the slump values. The decrease was negligible at fiber contents of 0.45 and 0.6 kg/m3. The fibers distributed well in the matrix. Fibers could be directly added in the mixer. The effect fibers had on unit weight of concrete is negligible. Addition of fibers up to 2.4 kg/m3 did not change the compressive, flexural, and splitting tensile strengths appreciably. Impact strength and flexural toughness increased consistently with the increase of fiber volume fraction.

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27

Srikanth, Viswanadha, Suhas Kowshik, Dhanraj Narasimha, Santosh Patil, Kaustubh Samanth e Udit Rathee. "Finite Element Modelling and Analysis of Fiber Reinforced Concrete under Tensile and Flexural Loading". Journal of Computers, Mechanical and Management 1, n. 1 (30 ottobre 2022): 12–18. http://dx.doi.org/10.57159/gadl.jcmm.1.1.22004.

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Abstract (sommario):

Concrete is a material exhibiting high compressive strength but about tenfold lower tensile strength. Its brittle property also prohibits the transmission of stresses after cracking. Thus, steel, polymer, polypropylene, glass, carbon, and other fibers are added to concrete to form fiber-reinforced concretes (FRC) having enhanced mechanical properties. The utilization of fiber-reinforced concrete is widespread. Identifying the mechanical properties of fiber-reinforced cement composites under dynamic loading, establishing relationships between their composition, structure, and properties, justifying the correct mathematical model, and determining its parameters are challenging. Utilizing finite elemental modeling and analysis to comprehend the mechanical characteristics of the FRC addition to concrete bricks has shown considerable benefit. In the present study, polypropylene microfibers are included in fiber-reinforced concrete composites, and their performance is compared to that of unreinforced concrete bricks. Under FEA analysis, three-point bending and uniaxial tensile tests were conducted. The results indicate that using fiber reinforcements increases the tensile strength and endurance of the brick.

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28

Zhang, Chang, Zhen Huang e Guo Wei Chen. "Experimental Research on Bamboo Fiber Reinforced Concrete". Applied Mechanics and Materials 357-360 (agosto 2013): 1045–48. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.1045.

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Abstract (sommario):

This paper studied the mechanical performance of bamboo fiber reinforced concrete through a series of compression, splitting and flexural tests. The comparative variables are the length and volume ratio of the bamboo fiber. The test results show that concretes splitting tensile property has obvious improvement when bamboo fibers are added, but the enhancement to the compression property and flexural property is not obvious.

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29

Shoaib, Mohd. "A Review: “Experimental Study on Steel Fiber Reinforced Concrete Using flat Crimped & Round Crimped Type Steel Fiber.”". International Journal for Research in Applied Science and Engineering Technology 10, n. 6 (30 giugno 2022): 2813–16. http://dx.doi.org/10.22214/ijraset.2022.44472.

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Abstract (sommario):

Abstract: Steel Fibre Reinforced Concretes are characterized by high tensile and flexural strengths and high ductility, as well as by a high compressive strength and a very good workability. Ductility and strength of concrete can be improved at lower fiber contents, where fibers are used in combination rather than reinforcement with a single type of fiber. Durability problems concerning one type of fiber may be offset with the presence of a second type of fiber. Steel Fiber is added by 1% volume of concrete. The different concrete mixesalong with control mix proportions as 100% round crimped type fiber, 50% round crimped type fiber -50% flat crimped type fiber and 100% flat crimped type fiber. Two types of crimped steel fiber i.e. round crimped type steel fiber and flat crimped steel fiber are used of length having 50mm. An extensive experimental investigation consisting of 12 specimen of size 50 x 10 x 10cm for determining flexural strength, 12 specimen for compressive strength and 12 specimen for split end test are used.In the experiment, an combination of steel fibre with concrete is used, which improved various mechanical properties and the strength. This review study is a trial of givingsome highlights for inclusion of steel fibers especially in terms of using them with new mix ratio combinations with concrete.

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30

Yu, Xiao Qing, Mao Lin, Guang Long Geng, Li Jia e Na Wei. "Steel Fiber Reinforced Concrete Pavement Maintenance". Applied Mechanics and Materials 252 (dicembre 2012): 276–79. http://dx.doi.org/10.4028/www.scientific.net/amm.252.276.

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Abstract (sommario):

In this paper, a cement concrete pavement, steel fiber reinforced concrete with than the experimental study, the analysis of steel fiber reinforced concrete pavement engineering, test results show that the steel fibers in the concrete evenly distributed, with cement mortarbetter integration, better crack resistance of concrete, and shrinkage of steel fiber reinforced concrete is much smaller than the specification requirements, and so has a great advantage for pavement repair.

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31

Mishra, Rajesh Kumar, Bijoya Kumar Behera, Vijay Chandan, Shabnam Nazari e Miroslav Muller. "Modeling and Simulation of Mechanical Performance in Textile Structural Concrete Composites Reinforced with Basalt Fibers". Polymers 14, n. 19 (30 settembre 2022): 4108. http://dx.doi.org/10.3390/polym14194108.

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Abstract (sommario):

This investigation deals with the prediction of mechanical behavior in basalt-fiber-reinforced concrete using the finite element method (FEM). The use of fibers as reinforcement in concrete is a relatively new concept which results in several advantages over steel-reinforced concrete with respect to mechanical performance. Glass and polypropylene (PP) fibers have been extensively used for reinforcing concrete for decades, but basalt fibers have gained popularity in recent years due to their superior mechanical properties and compatibility with concrete. In this study, the mechanical properties of basalt-fiber-reinforced concrete are predicted using FEM analysis, and the model results are validated by conducting experiments. The effect of fiber-volume fraction on the selected mechanical performance of concrete is evaluated in detail. Significant improvement is observed when the loading is increased. There are superior mechanical properties, e.g., load bearing and strain energy in basalt-fiber-reinforced concrete as compared to conventional concrete slabs reinforced with gravel or stones. The results of the simulations are correlated with experimental samples and show a very high similarity. Basalt-fiber-reinforced concrete (BFRC) offers a lightweight construction material as compared to steel-fiber-reinforced concrete (SFRC). Further, the problem of corrosion is overcome by using this novel fiber material in concrete composites.

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32

Juradin, Sandra, Ivica Boko, Ivanka Netinger Grubeša, Dražan Jozić, Silvija Mrakovčić e Iva Vukojević. "Properties of Spanish Broom Fiber Reinforced Concrete". Solid State Phenomena 322 (9 agosto 2021): 72–77. http://dx.doi.org/10.4028/www.scientific.net/ssp.322.72.

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Abstract (sommario):

Building materials based on renewable resources such as plant fibers are increasingly needed, especially if the plant is local and easily accessible. One such plant is the Spanish broom, a typical shrub of the Mediterranean region. In this work, Spanish broom fibers were used for the first time to reinforce concrete. Four mixtures were made: a reference mixture and three mixtures reinforced with 3 cm long fibers, in the amount of 0.5% of the total volume. Cement CEM I 42.5R, crushed limestone aggregate (D = 16 mm), and tap water were used for all the mixtures and in equal quantities. Four mortar mixtures were also made: standard mortar and 3 fiber-reinforced mortars. The mortar is reinforced with fibers of the same length and quantity as the concrete. The fibers were obtained by maceration of Spanish broom in solutions of 8%, 10%, and 15% NaOH. The quality and mechanical properties of the cellulose fibers depend on the geographical and climatic conditions and the fiber extraction procedures so the aim of this study was to evaluate the influence of different chemical pre-treatments of the fibers on the mechanical properties of the concrete. The properties of the fresh mix were determined using the flow method. Hardened concrete was tested for compressive and flexural strength and dynamic modulus of elasticity. Compressive and flexural strengths were determined on cement mortars. The results obtained on concrete were compared with those obtained on the mortar. It was concluded that the quality of composite materials is more influenced by the quality of the placement than by fiber treatment.

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33

Lee, Joo-Ha, Hwang-Hee Kim, Sung-Ki Park, Ri-On Oh, Hae-Do Kim e Chan-Gi Park. "Mechanical Properties and Durability of Latex-Modified Fiber-Reinforced Concrete: A Tunnel Liner Application". Advances in Materials Science and Engineering 2018 (2018): 1–14. http://dx.doi.org/10.1155/2018/2134873.

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Abstract (sommario):

This study assessed the mechanical properties and durability of latex-modified fiber-reinforced segment concrete (polyolefin-based macrosynthetic fibers and hybrid fiber-macrosynthetic fiber and polypropylene fiber) for a tunnel liner application. The tested macrosynthetic fiber-reinforced concrete has a better strength than steel fiber-reinforced concrete. The tested concrete with blast furnace slag has a higher chloride ion penetration resistance (less permeable), but its compressive and flexural strengths can be reduced with blast furnace slag content increase. Also, the hybrid fiber-reinforced concrete has higher compressive strength, flexural strength, chloride ion water permeability resistance, impact resistance, and abrasion resistance than the macrosynthetic fiber-reinforced concrete. The modified fiber improved the performance of concrete, and the hybrid fiber was found to control the formation of micro- and macrocracks more effectively. Therefore, overall performance of the hybrid fiber-reinforced concrete was found superior to the other fiber-reinforced concrete mixes tested for this study. The test results also indicated that macrosynthetic fiber could replace the steel fiber as a concrete reinforcement.

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34

Zhao, Jun, Li Jun Wang e Dan Ying Gao. "Load and Deformation Properties of Steel Fiber Reinforced Concrete ShearWall". Applied Mechanics and Materials 69 (luglio 2011): 23–27. http://dx.doi.org/10.4028/www.scientific.net/amm.69.23.

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Abstract (sommario):

The numerical simulation by nonlinear finite element method(FEM) was adopted to analyze the behavior and the influences of the volume fraction of steel fibers and the strength of steel fiber reinforced concrete on the load capacity and the deformation performance of reinforced concrete shearwalls.The effect of steel fiber on the FEM was determined. The results show that with the increase of the volume fraction of steel fibers, the crack load, bearing capacity and ductility coefficient of steel fiber reinforced concrete shearwalls increase gradually. With the increase of the strength of steel fiber reinforced concrete, the bearing capacity and ductility coefficients of steel fiber reinforced concrete shearwalls decrease.

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35

Moradi, Mahdi, Ali Reza Bagherieh e Mohammad Reza Esfahani. "Constitutive modeling of steel fiber-reinforced concrete". International Journal of Damage Mechanics 29, n. 3 (24 maggio 2019): 388–412. http://dx.doi.org/10.1177/1056789519851159.

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Abstract (sommario):

Experimental studies within the previous years showed that the behavior of concrete is improved by adding steel fibers. Due to bridging effect, steel fibers in a concrete matrix prevent crack propagation under static loads. This phenomenon increases the load-bearing capacity of steel fiber-reinforced concrete, specifically after the peak load. In contrast to similar studies, in this study the effect of fibers on steel fiber-reinforced concrete is directly described based on uniaxial compressive and tensile stress–strain curves. For this purpose, the effect of fiber on the stress variations is extracted from the difference between steel fiber-reinforced concrete and its corresponding concrete matrix uniaxial stress–strain curves. These differential stress curves were extracted from 103 experimental specimens, collected from the literature. Then, some equations were developed for them with appropriate accuracy, using genetic programming technique. These equations were only based on primary specifications of fibers and concrete matrix. In the next stage, an elastoplastic damage constitutive model initially developed for plain concrete was modified, using the developed steel fiber-reinforced concrete modeling equations. The proposed model was implemented in a finite element analysis software and successfully simulated the steel fiber-reinforced concrete behavior subjected to uniaxial and flexural experiments.

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36

Chernil'nik, A., V. Smachney, D. El'shaeva, Y. Zherebtsov e N. Dotsenko. "INFLUENCE OF THE TYPE OF FIBERS USED ON THE STRENGTH AND DEFORMATION OF DISPERSED-REINFORCED LIGHTWEIGHT CONCRETE". Bulletin of Belgorod State Technological University named after. V. G. Shukhov 7, n. 2 (14 febbraio 2022): 20–29. http://dx.doi.org/10.34031/2071-7318-2021-7-2-20-29.

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Abstract (sommario):

Fiber-reinforced concretes with improved strength and deformation characteristics are widely used in construction. The research is aimed to study the stress-strain condition of lightweight fiber-reinforced concrete, to plot stress-strain diagrams and analyze them. In total, four series of prism specimens are manufactured and tested. The first series is the control composition of lightweight concrete; the second series is lightweight concrete with a basalt fiber content of 3%; the third series is lightweight concrete with a glass fiber content of 3 %; the fourth series is lightweight concrete with a basalt fiber content of 1.5 % and 1.5 % glass fiber. The experimental studies demonstrate that lightweight concrete reinforced with basalt fiber has the highest deformability. In comparison with glass fiber, basalt fiber has a higher tensile strength and a higher elastic modulus. The fact that the concrete matrix and basalt fiber work together better is primarily due to the best mechanical characteristics of the basalt fiber. Further research prospects are determined in terms of determining the adhesion strength of various types of fibers with a matrix and studying the effect of this indicator on both the strength and deformation characteristics of lightweight concrete.

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37

Xia, Yuanyuan, e Guijun Xian. "Hybrid basalt/flax fibers reinforced polymer composites and their use in confinement of concrete cylinders". Advances in Structural Engineering 23, n. 5 (10 novembre 2019): 941–53. http://dx.doi.org/10.1177/1369433219886084.

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Abstract (sommario):

Flax fiber–reinforced polymer composites were determined to be effective in confinement of concrete cylinders. Flax fibers exhibit strong intrinsic hydrophilic properties and relatively inferior mechanical properties; therefore, combining them with mineral-based natural fiber (i.e. basalt fibers) was proposed. In the present study, unidirectional flax–basalt hybrid fiber reinforced polymer plates and tubes were prepared using a filament-winding process. The mechanical properties of the fiber-reinforced polymer plates and compressive properties of the concrete-filled fiber-reinforced polymer tubes were studied. Compared to those of flax fiber–reinforced polymer, hybrid fiber–reinforced polymers exhibited linear rather than bilinear stress–strain curves and enhanced tensile properties. The lateral–axial relationship of the hybrid fiber reinforced polymer–confined concrete cylinders can be well predicted by the classic model for glass- or carbon-based fiber-reinforced polymer-confined concrete cylinders, however, the axial stress–strain cannot. In addition, the lateral–axial relationship of the hybrid fiber reinforced polymer–confined cylinders depends on the arrangement of the fiber layers.

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38

Matsuoka, S., e H. Horii. "Fiber Reinforced Concrete". Concrete Journal 37, n. 4 (1999): 19–24. http://dx.doi.org/10.3151/coj1975.37.4_19.

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39

Ziane, Sami, Mohammed-Rissel Khelifa e Samy Mezhoud. "A Study of the Durability of Concrete Reinforced with Hemp Fibers Exposed to External Sulfatic Attack". Civil and Environmental Engineering Reports 30, n. 2 (1 giugno 2020): 158–84. http://dx.doi.org/10.2478/ceer-2020-0025.

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Abstract (sommario):

AbstractThe purpose of this paper is to study the durability of concrete reinforced with hemp fibers in the face of external Sulfatic attack. For this purpose, five types of concrete were formulated; three types of concrete reinforced with hemp fibers (HC-0.25, HC-0.5, and HC-1) at 0.25%, 0.5%, and 1 % of hemp fibers in volume, respectively. And two control concretes, being ordinary concrete (OC) and polypropylene fiber reinforced concrete (PC). To assess the sulfatic attacks, the described concrete types underwent two aging protocols: 1) a complete immersion in 12.5 % Sodium Sulfate (Na2SO4) solution, and 2) an accelerated aging protocol consisting of immersion/drying in the same sulfate solution at a temperature of 60°C. The results show that concrete reinforced with 0.25 % of hemp fibers is the optimal amount compared to control concretes in terms of physico-mechanical performance and durability under sulfate attack. This number of fibers could enable the production of green and durable structural concretes based on untreated hemp fibers.

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40

Ganjave, Shubham, Samarth Chavan, Lalit Chaudhari, Ajay Gaikwad, Rushikesh Avhad, S. E. Shinde, P. H. Chavanke e P. G. Chavan. "Polymer Fiber Reinforced Concrete Pavements". International Journal for Research in Applied Science and Engineering Technology 10, n. 5 (31 maggio 2022): 2132–34. http://dx.doi.org/10.22214/ijraset.2022.42750.

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Abstract (sommario):

Abstract: The old method for using the traditional bituminous pavements have to be needs for continuous maintenance and repair work .In India there are several advantages of cement concrete pavements over bituminous pavements because of india has to leading growth country than other. This paper explains on POLYMER FIBRE REINFORCED CONCRETE PAVEMENTS, which is a recent advanced in the field of reinforced concretepavement in designs. In this project showing that how can Fibers help to improve the ductility performance, pre-crack tensile strength, fatigue strength, impact strength and shrinkage cracks. FRC satisfies two of the much demanded requirements of pavement material in economy and reduced pollution. Fibre reinforcement pavement has to reduce the cost of additional maintenance required on concreted pavement. It is ecofriendly and long life sustainability pavement.

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41

Wu, Ying, Qiao Yao Sun e Wei Li. "Improved Bending Strength and early Crack-Resistance Performance of Engineered Cementitious Composites Reinforced by Hybrid-Fiber". Applied Mechanics and Materials 174-177 (maggio 2012): 1047–50. http://dx.doi.org/10.4028/www.scientific.net/amm.174-177.1047.

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Abstract (sommario):

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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42

Yew, Ming Kun, e Othman Ismail. "Mechanical Properties of Hybrid Nylon-Steel- and Steel-Fibre-Reinforced High Strength Concrete at Low Fibre Volume Fraction". Advanced Materials Research 168-170 (dicembre 2010): 1704–7. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.1704.

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Abstract (sommario):

The mechanical properties of hybrid nylon-steel-fiber-reinforced concrete were investigated in comparison to that of the steel-fiber-reinforced concrete, at the same volume fraction (0.5%). The combining of fibers, often called hybridization is investigated in this paper for a very high strength concrete of an average compressive strength of 105 MPa. Test results showed that fibers when used in a hybrid nylon-steel fibers reinforced concrete form could result in superior composite performance compared to steel-fiber-reinforced concrete. The basic property of the hybridized material that was evaluated and analyzed extensively was the modulus of rupture (MOR) and splitting tensile while the compressive strength was only slightly decreased compared to single steel fiber reinforced concrete. There is a synergy effect in the hybrid fibers system.

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43

Zhang, Bing, Jun-Liang Zhao, Tao Huang, Ning-Yuan Zhang, Yi-Jie Zhang e Xia-Min Hu. "Effect of fiber angles on hybrid fiber-reinforced polymer–concrete–steel double-skin tubular columns under monotonic axial compression". Advances in Structural Engineering 23, n. 7 (2 gennaio 2020): 1487–504. http://dx.doi.org/10.1177/1369433219895916.

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Abstract (sommario):

Hybrid fiber-reinforced polymer–concrete–steel double-skin tubular columns are a novel form of hollow columns that combine two traditional construction materials (i.e. concrete and steel) with fiber-reinforced polymer composites. Hybrid fiber-reinforced polymer–concrete–steel double-skin tubular columns consist of an inner tube made of steel, an outer tube made of fiber-reinforced polymer, and a concrete layer between the two tubes. Existing studies, however, are focused on hybrid fiber-reinforced polymer–concrete–steel double-skin tubular columns with fibers of the fiber-reinforced polymer tube oriented in the hoop direction or close to the hoop direction. In order to investigate the effect of fiber angles (i.e. the fiber angle between the fiber orientation and the longitudinal axis of the fiber-reinforced polymer tube), monotonic axial compression tests were conducted on hybrid fiber-reinforced polymer–concrete–steel double-skin tubular columns with an fiber-reinforced polymer tube of ±45°, ±60°, or ±80° fiber angles. There were two types of steel tubes adopted for these hybrid fiber-reinforced polymer–concrete–steel double-skin tubular columns. The fiber-reinforced polymer tube thickness was also investigated as an important parameter. Experimental results showed that the confinement effect of the fiber-reinforced polymer tube increased with the increase of the absolute value of fiber angles, whereas the ultimate axial strain of hybrid fiber-reinforced polymer–concrete–steel double-skin tubular columns decreased with the increase of the absolute value of fiber angles. An existing stress–strain model, which was developed on the basis of hybrid fiber-reinforced polymer–concrete–steel double-skin tubular columns with an fiber-reinforced polymer tube of ±90° fiber angles, is verified using the test results of this study. For the compressive strength of the confined concrete in hybrid fiber-reinforced polymer–concrete–steel double-skin tubular columns, the existing model provides conservative predictions for specimens with a ±80° fiber-reinforced polymer tube, overestimated predictions for specimens with a ±60° fiber-reinforced polymer tube, and close predictions for specimens with a ±45° fiber-reinforced polymer tube.

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44

Selvi, K., e S. Karthi. "Experimental Strength on Polypropylen Fiber Reinforced Concrete". International Journal for Research in Applied Science and Engineering Technology 10, n. 12 (31 dicembre 2022): 1934–38. http://dx.doi.org/10.22214/ijraset.2022.48229.

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Abstract: The paper presents research work of experimental investigation on polypropylene fiber reinforced concrete by replacing river sand to artificial sand with and without admixture. Use of fiber reinforce polymer in civil engineering increase rapidly. Various type of fiber is used such as glass, carbon, steel, asbestos, polyester and polypropylene. The various experimental investigations for determination of properties of polypropylene fiber are discussed in paper work. This paper presents the effect of polypropylene (PP) fibers on various properties of concrete such as compressive strength, tensile strength, workability, and fracture properties with various content of fiber(0% ,0.5%,1.0%,1.5%). The result of this present investigation indicates that by adding of 0.5% of polypropylene fiber shows maximum compressive and tensile strength.

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45

Terai, Masakazu, e Koichi Minami. "Fracture Behavior and Mechanical Properties of Bamboo Fiber Reinforced Concrete". Key Engineering Materials 488-489 (settembre 2011): 214–17. http://dx.doi.org/10.4028/www.scientific.net/kem.488-489.214.

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Abstract (sommario):

Fiber reinforced concrete is superior to plain concrete in toughness, which is the energy absorption at fracture. This study is intended to use fibers extracted from bamboo for tensile reinforcement of concrete. Some experiments were carried out to explore the possibility of bamboo fiber reinforced concrete. As a result, the compressive strength of concrete with 1-2% bamboo fiber is little different from the case without reinforcement. On the other, the splitting tensile and the flexural strength significantly increased with an increased volume fraction of fibers. The strength of bamboo fiber reinforced concrete increased with increasing fiber content as a result of fiber bridging.

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46

Nguyen, Duy-Liem, Duc-Kien Thai e Dong-Joo Kim. "Direct tension-dependent flexural behavior of ultra-high-performance fiber-reinforced concretes". Journal of Strain Analysis for Engineering Design 52, n. 2 (febbraio 2017): 121–34. http://dx.doi.org/10.1177/0309324716689625.

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Abstract (sommario):

This research investigated the effects of direct tensile response on the flexural resistance of ultra-high-performance fiber-reinforced concretes by performing sectional analysis. The correlations between direct tensile and flexural response of ultra-high-performance fiber-reinforced concretes were investigated in detail for the development of a design code of ultra-high-performance fiber-reinforced concrete flexural members as follows: (1) the tensile resistance of ultra-high-performance fiber-reinforced concretes right after first-cracking in tension should be higher than one-third of the first-cracking strength to obtain the deflection-hardening if the ultra-high-performance fiber-reinforced concretes show tensile strain-softening response; (2) the equivalent bottom strain of flexural member at the modulus of rupture is always higher than the strain capacity of ultra-high-performance fiber-reinforced concretes in tension; (3) the softening part in the direct tensile response of ultra-high-performance fiber-reinforced concretes significantly affects their flexural resistance; and (4) the moment resistance of ultra-high-performance fiber-reinforced concrete girders is more significantly influenced by the post-cracking tensile strength rather than the tensile strain capacity. Moreover, the size and geometry effects should be carefully considered in predicting the moment capacity of ultra-high-performance fiber-reinforced concrete beams.

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47

Huo, Jun Fang, Da Peng Liu, Xiang Dong Shen, Jian Jun Chu e De Tian Song. "Freeze-Thaw Model and Service Life Prediction of Hybrid Fiber Reinforced Lightweight Aggregate Concrete". Advanced Materials Research 250-253 (maggio 2011): 817–21. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.817.

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Abstract (sommario):

The effect of the frost resistance on hybrid fibers reinforced lightweight aggregate concrete is investigated. And hybrid fibers reinforced lightweight aggregate is that steel fiber and polypropylene fiber are selected to incorporate into. The results indicate that, hybrid fibers reinforced lightweight aggregate concrete can improve the frost resistance. The weight loss rate of hybrid fibers reinforced lightweight aggregate concrete is not better. The research to establish a model for service life prediction of hybrid fibers reinforced lightweight aggregate concrete on experimental results has been done.

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48

Wang, Xian Dong, Chang Zhang, Zhen Huang e Guo Wei Chen. "Impact Experimental Research on Hybrid Bamboo Fiber and Steel Fiber Reinforced Concrete". Applied Mechanics and Materials 357-360 (agosto 2013): 1049–52. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.1049.

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Abstract (sommario):

This paper studied experimentally the impact mechanical properties of bamboo fiber and hybrid steel fiber reinforced concrete. Steel fiber is already used in construction widely, but it is expensive in cost. As a kind of green building material, bamboo fiber can be used in the infrastructures together with concrete to improve the concretes mechanical properties. In order to investigate the impact mechanical properties of concrete reinforced with bamboo fiber and steel fiber, a series of concrete specimens reinforced with bamboo fiber, steel fiber or both steel fiber and bamboo fiber are investigated with self-designed impact device. The impact resistance abilities are tested and compared.

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49

Deaconu, O., e GC Chiţonu. "Using fibers in construction". IOP Conference Series: Materials Science and Engineering 1242, n. 1 (1 aprile 2022): 012013. http://dx.doi.org/10.1088/1757-899x/1242/1/012013.

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Abstract (sommario):

Abstract This article is an overview about alternative solutions for reinforced concrete by using different types of fibers. The use of fiber reinforced concrete when is compared to the conventional reinforced concrete solutions. This study has taken in consideration structural performance and the total cost. The use of fibers or dispersed reinforcement also improves some of the characteristics of concrete, such as those related to: cracking, freezing, durability, erosion of ordinary or marine water, wind erosion, permeability, etc. In order to correct to a large extent, the unfavorable characteristics of the reinforced concrete, in the mass of the fresh concrete various types of fibers can be mixed and incorporated in the use of concrete with dispersed reinforcement. As materials often used as fibers, the most commonly are: hooked-end steel (steel fibers), straight polypropylene and straight polyolefin, glass fiber, carbon fiber, aramid fiber, natural hemp fibers, jute, hair, straw, etc.

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50

Ouyang, Dong, Lin Jie Kong, Hao Fu, Liu Li Lu, Long Liao e Chen Wu Huang. "Experimental Investigations on Mechanical Properties and Fire Resistance of Steel-Polypropylene Hybrid Fiber Reinforced Concrete". Advanced Materials Research 772 (settembre 2013): 182–87. http://dx.doi.org/10.4028/www.scientific.net/amr.772.182.

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Abstract (sommario):

This paper investigates the mechanical properties and the fire resistance of steel-polypropylene hybrid fiber-reinforced concrete. The type of the polypropylene fibers are polypropylene monofilament fiber, polypropylene fibrillated fiber, and macro polypropylene fiber, and the type of the steel fibers is hooked steel fiber. The experimental results show that the compressive strength, splitting tensile strength and flexural properties of steel-macro polypropylene hybrid fiber reinforced concrete are better than any others. And the fire resistance of steel-monofilament polypropylene hybrid fiber reinforced concrete is the best.

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