Journal articles on the topic 'High-strength SCC'
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Ramamurthy, Sridhar, and Andrej Atrens. "Stress corrosion cracking of high-strength steels." Corrosion Reviews 31, no. 1 (March 1, 2013): 1–31. http://dx.doi.org/10.1515/corrrev-2012-0018.
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AbstractThe mechanisms of stress corrosion cracking (SCC) and hydrogen embrittlement were recently reviewed by Lynch in this journal. The present review, in contrast, focuses on the rate-limiting step of the SCC of low-alloy high-strength steels in water and particularly focuses on the influence of the applied stress rate on the SCC of low-alloy high-strength steels. Linearly increasing stress tests of low-alloy high-strength steels in distilled water indicated that the stress corrosion crack velocity increased with increasing applied stress rate until the maximum crack velocity, corresponding to vII in fracture mechanics tests in distilled water. Moreover, the crack velocity was dependent only on the applied stress rate and was not influenced by the steel composition. The rate-limiting step could be the rupture of a surface film, which would control the rate of metal dissolution and/or the production and transport of hydrogen to the crack tip or to the regions ahead of the crack tip.
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Prabhuraj, P., S. Rajakumar, A. K. Lakshminarayanan, and V. Balasubramanian. "Evaluating stress corrosion cracking behaviour of high strength AA7075-T651 aluminium alloy." Journal of the Mechanical Behavior of Materials 26, no. 3-4 (December 20, 2017): 105–12. http://dx.doi.org/10.1515/jmbm-2017-0019.
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AbstractThe objective of the present study is to determine the threshold stress level of stress corrosion cracking (SCC) in AA7075-T651 aluminium alloy by suitable experimentation. The test was carried out using a circumferential notch specimen in a horizontal-type constant load SCC setup in a 3.5 wt.% NaCl solution. The time to failure by SCC was determined at various loading conditions. The threshold stress of AA7075-T651 alloy was found to be 242 MPa in a 3.5 wt.% NaCl solution. The various regions of the fractured surface specimen such as machined notch, SCC region and final overload fracture area were examined using scanning electron microscopy (SEM) in order to identify the SCC mechanism.
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Vivek, S. S., and G. Dhinakaran. "Durability characteristics of binary blend high strength SCC." Construction and Building Materials 146 (August 2017): 1–8. http://dx.doi.org/10.1016/j.conbuildmat.2017.04.063.
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Amalia, L. Tiyani, Y. Setiawan, and M. F. R. Hasan. "Performance of SCC Concrete with Additional Materials of Rice Husk Ash." IOP Conference Series: Earth and Environmental Science 1116, no. 1 (December 1, 2022): 012074. http://dx.doi.org/10.1088/1755-1315/1116/1/012074.
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Abstract Concrete with high ductility, workable, high strength, easy to flow without compaction, and durable is a concrete need in the future. Concrete with this quality, one of which is to make self-compacting concrete (SCC). This paper reports performance of self compacting concrete (SCC) containing rice hush ash. Rice husk ash is waste from burning rice husks. The purpose of this study was to determine the performance of SCC concrete with the addition of rice husk ash. SCC specimens were made using rice husk ash (RHA) and SCC without rice husk ash (NRHA). The specimens were made with water cement ratio 0.30. Superplastisizer used is a type Naptha 511P. The result indicated that the workability of SCC containing rice hush ash (RHA) more workable compare SCC without rice hush ash (NRHA). The initial setting time of SCC with rice hush ash more slowly compare SCC without rice hush ash. The compressive strength, flexural strength, and tensile strength of SCC RHA mor higher compare SCC without RHA (NRHA). The tensile strength value of RHA and without RHA concrete meets the tensile strength requirements of RSNI T-12-2004.
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Rohman, R. K., S. A. Kristiawan, H. A. Saifullah, and A. Basuki. "Reinforcement to concrete bond strength: a comparison between normal concrete and various types of concrete." Journal of Physics: Conference Series 2190, no. 1 (March 1, 2022): 012028. http://dx.doi.org/10.1088/1742-6596/2190/1/012028.
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Abstract This paper describes the bond strength comparison between concrete and reinforcement with several types of concrete. The types of concrete studied were normal concrete (NC), Self-Compacting Concrete (SCC), High-Volume Fly Ash Concrete (HVFAC), and High-Volume Fly Ash Self-Compacting Concrete (HVFA-SCC). Research data were obtained from previous studies. The data of concrete bond strength were obtained by testing the reinforced concrete beam with a lap splice in the tensile moment area. Bond strength values were normalized by dividing with the square root of concrete grade. Then use normalized data to formulate the relationship between the length of lap splice to diameter ratio (ls/db) and the normalized bond strength concrete for both normal concrete and SCC. From the obtained relationship, we can compare the bond strength between NC and SCC. The SCC bond strength is higher than NC. Bond strength of HFVAC and HVFA-SCC is also higher than NC and SCC, so that the use of HVFA-SCC can reduce the need for lap splice.
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Bumanis, Girts, Diana Bajare, and Aleksandrs Korjakins. "Durability of High Strength Self Compacting Concrete with Metakaolin Containing Waste." Key Engineering Materials 674 (January 2016): 65–70. http://dx.doi.org/10.4028/www.scientific.net/kem.674.65.
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Metakaolin is considered as one of most promising pozzolanic microfiller material in concrete industry. Metakaolin is a high value product obtained from kaolin clay calcined at high temperatures which also can be effectively used in ceramic industry therefore its application in concrete industry is rather limited. In present research metakaolin containing waste (MKW) by-product was studied as a partial cement replacement in high strength self compacting concrete (SCC). Obtained waste material derives from the foam glass granule production plant where kaolin clay is used as releasing agent during heating process and in the end metakaolin with glass impurities is obtained as by-product. In present research 5 to 15 wt.% of cement was replaced by MKW. A constant water amount was used for all mixtures and workability (>600 mm by cone flow) was ensured by changing the amount of superplasticizer. Compressive strength was tested at the age of 7, 28 and 180 days. To determine durability of SCC the chloride penetration was tested according to NT BUILD 492, freeze-thaw test according to LVS 156-1:2009 annex C and alkali-silica reactivity test according to RILEM TC 106-AAR-2. The results indicate that cement replacement by MKW did not affect the strength of SCC significantly. At the age of 28 days SCC with 15 wt.% of MKW reached compressive strength of 70 MPa comparing to 68 MPa to reference mixture. The chloride penetration test results indicated that the non-steady-state migration coefficient of reference samples was reduced 3.7 times and it was concluded that SCC resistance to chloride penetration can be increased by incorporation of MKW in mixture composition. Freeze-thaw test results indicated that obtained SCC can withstand at least 500 freeze-thaw cycles without surface damage and weight loss. It was concluded that up to 15 wt.% of cement can be replaced by metakaolin containing waste without strength loss and the durability of SCC could be increased.
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Kannan, M. Bobby, and V. S. Raja. "Enhancing the Localized Corrosion Resistance of High Strength 7010 Al-Alloy." Advanced Materials Research 138 (October 2010): 1–6. http://dx.doi.org/10.4028/www.scientific.net/amr.138.1.
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This paper brings out the developments on heat-treatment and alloying to improve the stress corrosion cracking (SCC) behavior of 7010 Al-alloy. The role of microstructures including the grain boundary precipitates and recystallized grains and the relation of intergranular corrosion (IGC) on the SCC behavior of 7010 Al-alloy have been discussed.
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Long, Wu Jian, Wei Lun Wang, Qi Ling Luo, and Bi Qin Dong. "Factorial Design Approach of Ultra-High Performance Concrete." Applied Mechanics and Materials 405-408 (September 2013): 2847–50. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.2847.
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In order to understand the influence of mixture parameters on ultra-high strength self-consolidating concrete (UHS-SCC) behaviour, an experimental design was carried out in this investigation. In total, 19 SCC mixtures were prepared to determine several key responses that affect the slump flow and compressive strength of UHS-SCC. The statistical models derived from the factorial design approach can be used to quantify the effect of mixture parameters and their coupled effects on fresh and mechanical properties of SCC.
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Mohamed, Osama. "Durability and Compressive Strength of High Cement Replacement Ratio Self-Consolidating Concrete." Buildings 8, no. 11 (November 6, 2018): 153. http://dx.doi.org/10.3390/buildings8110153.
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This study examines durability and mechanical properties of sustainable self-consolidating concrete (SCC) in which 80% of the cement is replaced with combinations of recycled industrial by-products including fly ash, silica fume, and ground granulated blast furnace slag (GGBS). The water to binder (w/b) ratio of SCC mixes studies was maintained at 0.36. The study proposes empirical relationships to predict 28-day compressive strengths based on the results of three-day and seven-day compressive strengths. In addition, the chloride penetration resistance of the various sustainable SCC mixes was determined after three days, seven days, and 28 days of moist curing of concrete standards. It was concluded that fly ash, silica fume, and GGBS contribute favorably to enhancing strength development, fresh properties, and durability of SCC in comparison to ordinary Portland cement (OPC). The compressive strength of the sustainable SCC mixes falls within ranges suitable for structural engineering applications. Replacing cement with 15% silica fume produced a 28-day average compressive strength of 95.3 MPa, which is 44.2% higher than the control mix. Replacing cement with 15% or 20% silica fume reduced the chloride ion permeability to very low amounts compared to high permeability in a control mix.
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V, LOHITHA, KRISHNESWAR R, and KUMAR B. NARENDRA. "COMPARITIVE STUDY ON HIGH STRENGTH FIBER REINFORCED SELF CURING SCC AND CONVENTIONAL CURED SCC." i-manager’s Journal on Structural Engineering 5, no. 2 (2016): 32. http://dx.doi.org/10.26634/jste.5.2.8157.
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Mukai, David J., Simten Altan, and John Q. Ehrgott. "Early Strength of Self-Compacting Concrete." Transportation Research Record: Journal of the Transportation Research Board 1698, no. 1 (January 2000): 61–69. http://dx.doi.org/10.3141/1698-09.
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The researchers’ primary objective was to evaluate the early-strength characteristics of self-compacting concrete (SCC), which is a type of concrete that can be placed without external vibration, even in congested areas. Two unique characteristics of SCC are its high-percentage substitution of cement with fly ash or slag cement, or with both fly ash and slag cement and a relatively high superplasticizer dosage. Both of these characteristics retard early-strength gain. The impetus was to develop self-compacting concrete with an early strength suitable for precast applications. The major findings are that it is possible to proportion SCC mixtures with high early strength (30 MPa at 16 h under steam curing) and that high slump does not necessarily correlate with self-compaction.
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Kanagaraj, Balamurali. "Mechanical Properties and Microstructure Characteristics of Self-compacting Concrete with Different Admixtures Exposed to Elevated Temperatures." Jordan Journal of Civil Engineering 17, no. 1 (January 1, 2023): 1–9. http://dx.doi.org/10.14525/jjce.v17i1.01.
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Self-compacting concrete (SCC) is a high-performance concrete widely used as a building material. The present investigation examines the effects of age and cooling type (air-cooled and water-cooled) of SCC after being exposed to elevated temperatures and compares them to those of normal conventional concrete (NCC). Two types of concrete; i.e., NCC and SCC, were developed and studied for early-age and residual strengths. SCC was developed with three different types of admixtures; namely, fly ash (FA), silica fume (SF) and metakaolin (MK) as binder materials, by replacing the cement. The mechanical characteristics of FA- and SF-blended SCC before heating show similar results, whereas MK-based SCC possesses greater strength than other mixes. In the case of specimens exposed to high temperature of 1000℃, MK-blended SCC produced the lowest residual strength compared to FA- and SF-based mixes. Further microstructural investigation was conducted to examine the internal structure of the specimens exposed to various heating temperatures. From the results, it is concluded that the higher the strength gain upon aging, the greater the strength loss upon temperature rise. KEYWORDS: Self-compacting concrete, Fly ash, Silica fume, Metakaolin, Residual strength, Microstructure.
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Arun Kumar, H. R., and B. Shivakumaraswamy. "Experimental Investigation of Flow and Mechanical Properties of Fibrofor Fiber Reinforced Self-Compacting Concrete." Asian Journal of Engineering and Applied Technology 8, no. 2 (May 5, 2019): 8–15. http://dx.doi.org/10.51983/ajeat-2019.8.2.1146.
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Self Compacting Concrete is a material used in the construction that has excellent deformability in the fresh state and high resistance of segregation, and can be replaced and compacted under its self-weight without applying vibration which leads to substantial advantages related to better homogeneity, enhancement of working environment and improvement in the productivity by increasing the speed of construction. Concrete can be formulated with high compressive strength but always has lower tensile strength. Tensile strength and other properties of concrete can be enhanced by adding fibers due to which the workability of concrete mix reduces and in order to achieve the desired Workability super-plasticizers is added. In the present work the use of fibrofor fiber in the production of self-compacting concrete (SCC) has been studied to identify how fresh and hardened properties of SCC are affected by the addition of fibers. The fibrofor fiber of 19mm standard length is incorporated into the SCC mixtures as 0.5kg/m3, 1.0kg/m3, 1.5kg/m3of concrete. Test on fresh SCC like slump Flow test, T50, V-Funnel test, J-Ring slump test and L-Box test were performed for an understanding of flow of SCC and tests on hardened properties like flexural strength, compressive strength and split tensile strength have been conducted to identify the hardened properties of SCC produced with fibrofor fiber. A comparative study between plain concrete, SCC without fiber and SCC with fiber has been done. Mix design for M40 grade concrete has been done according to EFNARC guidelines. The results reveal that the use of fibro for fiber decreases the workability but increases the mechanical properties of SCC. The optimum volume fraction of fibrofor fiber is determined as 1kg/m3 considering the optimized flexural strength and split tensile strength based properties of SCC. Due to increase in strength properties of fiber reinforced SCC that can be used for pavement construction and various other structures such as buildings, water retaining structures, reservoir structures and tunnel etc.
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Nie, Lun, Min Zhu, Shirun Tu, Kefeng Yuan, and Kexin Lu. "Study on the Corrosion Resistance of 39SiCrVTiA High strength and high toughness spring steel." MATEC Web of Conferences 353 (2021): 01010. http://dx.doi.org/10.1051/matecconf/202135301010.
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39SiCrVTiA spring steel is heat-treated and compared with the existing high-strength spring steels 60Si2CrVA and SAE9254 for electrochemical impedance spectroscopy (EIS), polarization curve and slow strain rate testing (SSRT). The test results of electrochemical impedance spectroscopy (EIS), polarization curve show that the corrosion resistance of 60Si2CrVA was the best, followed by that of SAE9254 and 39SiCrVTIA.However, the test results of the SSRT test show that the three spring steels in 5% NaCl solution possess high SCC susceptibility. The SCC susceptibility of 39SiCrVTiA steel is slightly lower and the stress corrosion ability is better than the other two steels which may be related to its containing Ti, V elements and lower carbon content.
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Salih, Moslih Amer, Shamil Kamil Ahmed, Shaymaa Alsafi, Mohd Mustafa Al Bakri Abullah, Ramadhansyah Putra Jaya, Shayfull Zamree Abd Rahim, Ikmal Hakem Aziz, and I. Nyoman Arya Thanaya. "Strength and Durability of Sustainable Self-Consolidating Concrete with High Levels of Supplementary Cementitious Materials." Materials 15, no. 22 (November 11, 2022): 7991. http://dx.doi.org/10.3390/ma15227991.
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Self-consolidating concrete (SCC) has been used extensively in the construction industry because of its advanced characteristics of a highly flowable mixture and the ability to be consolidated under its own weight. One of the main challenges is the high content of OPC used in the production process. This research focuses on developing sustainable, high-strength self-consolidating concrete (SCC) by incorporating high levels of supplementary cementitious materials. The overarching purpose of this study is to replace OPC partially by up to 71% by using fly ash, GGBS, and microsilica to produce high-strength and durable SCC. Two groups of mixtures were designed to replace OPC. The first group contained 14%, 23.4%, and 32.77% fly ash and 6.4% microsilica. The second group contained 32.77%, 46.81%, and 65.5% GGBS and 6.4% microsilica. The fresh properties were investigated using the slump, V-funnel, L-box, and J-ring tests. The hardened properties were assessed using a compressive strength test, while water permeability, water absorption, and rapid chloride penetration tests were used to evaluate the durability. The innovation of this experimental work was introducing SCC with an unconventional mixture that can achieve highly durable and high-strength concrete. The results showed the feasibility of SCC by incorporating high volumes of fly ash and GGBS without compromising compressive strength and durability.
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Hake, Sandeep L., S. S. Shinde, Piyush K. Bhandari, P. R. Awasarmal, and B. D. Kanawade. "Effect of Glass Fibers on Self Compacting Concrete." E3S Web of Conferences 170 (2020): 06018. http://dx.doi.org/10.1051/e3sconf/202017006018.
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Self Compacting Concrete (SCC) is a specially developed concrete for concreting under extreme condition of inaccessibility from heights. It is capable to flow under influence of its own weight. It could be used when encountered with dense reinforcement and complex structural design. Problem of segregation as well as bleeding is eliminated and vibration is not required for compaction. As concrete is strong in compression and weak in tension. Hence to make it strong in tension, discontinuous Anti-Crack high dispersion glass fibers are added. SCC mix prepared with addition of discontinuous glass fibers is called as Glass Fiber reinforced Self Compacting Concrete (GFRSCC). In this paper an experimental study has been carried out to check the effect of Anti-Crack high dispersion glass fibers on the compressive strength, split tensile strength and flexural strength of SCC. The result show that, as compared to the Normal SCC, the compressive strength of GFRSCC increases by 2.80% and 12.42%, the split tensile strength of GFRSCC increases by 4.47% and 25.12% and the flexural strength of SCC increases by 6.57% and 14.34% when the Cem-FIL Anti-Crack HD glass fibers were added as 0.25% and 0.50% respectively by the weight of total cementitious material contents. The addition of 0.25% Cem-FIL Anti-Crack HD glass fibers to SCC has not much affect on the workability of Normal SCC. Whereas, addition of 0.50% Cem-FIL Anti-Crack HD glass fibers reduces the workability of SCC.
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Shrihari, S., M. V Seshagiri Rao, V. Srinivasa Reddy, and Venkat Sai. "Mix proportioning of M80 grade Self-Compacting Concrete based on Nan Su Mix design method principles." International Journal of Engineering & Technology 7, no. 3.35 (September 2, 2018): 52. http://dx.doi.org/10.14419/ijet.v7i3.35.29146.
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The quest for the development of high strength and high performance concretes has increased considerably in recent times because of the demands from the construction industry. High-performance concretes can be produced at lower water/powder ratios by incorporating these supplementary materials. Fly ash addition proves most economical among these choices, even though addition of fly ash may lead to slower concrete hardening. However, when high strength is desired, use of silica fume is more useful. This paper proposes a mix proportions for M80 grade Self-compacting concrete (SCC) based on Nan Su mix design principles. First, the amount of aggregates required is determined, and the paste of binders is then filled into the voids of aggregates to ensure that the concrete thus obtained has flowability, self-compacting ability and other desired SCC properties. The amount of aggregates, binders and mixing water, as well as type and dosage of superplasticizer (SP) to be used are the major factors influencing the properties of SCC. Slump flow, V-funnel, L-flow, U-box and compressive strength tests were carried out to examine the performance of SCC, and the results indicate that the Nan Su method could produce successfully SCC of high strength. Based on Nan Su mix design method, material quantities such as powder content ( Cement + Pozzolan ), fine aggregate, coarse aggregate, water and dosages of SP and VMA, required for 1 cu.m, are evaluated for High strength grade (M80) of Self Compacting Concrete (SCC) are estimated. Final quantities, of M80 grade SCC mix, is assumed after several trial mixes on material quantities computed using Nan Su mix design method subjected to satisfaction of EFNARC flow properties.
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Xian, Xiang Ping, Wu Jian Long, Biao Yi Chen, Min Yi Huang, and Yong Fa Fan. "High-Strength Self-Compacting Concrete and its Application in Shenzhen Mangrove Garden." Applied Mechanics and Materials 438-439 (October 2013): 338–41. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.338.
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Self-compacting concrete (SCC) refers to one kind of high-performance concrete which can fill formwork and condensed reinforced steel by the weight of concrete mixture without vibration. In this investigation, local raw materials from Shenzhen Jinqiang Concrete Co. Ltd were employed. Self-compacting concrete mixtures with targeted 3-day compressive strengths of 60MPa or 80MPa and required flow properties were evaluated. Moreover, the SCC was successfully applied in Shenzhen Mangrove Garden project.
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A. Ismael, Murtada, Haitham J. Abd, and Adham A. Hameed. "Effect of Coarse Aggregate Size on Shear Behavior of Self-Compacting Concrete and Conventional Concrete Beams." International Journal of Engineering & Technology 7, no. 4.20 (November 28, 2018): 359. http://dx.doi.org/10.14419/ijet.v7i4.20.26135.
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This research presents an experimental study to investigate the effect of coarse aggregate maximum size on the shear behavior of self-compacting concrete (SCC) and conventional concrete (CC) slender beams having the same compressive strength and make a comparison between the shear behavior of concrete beams. The experimental program included casting and testing eight beams with a constant size of 150mm height ×125mm width×1000mm length. Two coarse aggregate maximum sizes were used (10mm and 20mm) with SCC and CC in normal and high strength concrete. The results showed that increasing the coarse aggregate maximum size from 10mm to 20mm results in a slight increase in the diagonal cracking load and ultimate shear strength of SCC beams, while for CC beams the result was more significant. Also, it was found that the effect of increasing the coarse aggregate maximum size was more significant for normal strength as compared with high strength beams for both concrete types. Furthermore, the comparison between the shear behavior of SCC and CC beams having the same compressive strength and a concrete with the same coarse aggregate maximum size revealed that the SCC exhibited less diagonal cracking load and less ultimate strength compared with CC.
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Liu, Shu Hua. "Key Techniques of Self-Compacting Concrete." Advanced Materials Research 261-263 (May 2011): 394–97. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.394.
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Self-compacting concrete (SCC) is a new style of concrete with high workability. The key techniques of SCC including workability, strength, dimension stability, thermal properties and durability were investigated in this paper. High workability can be achieved at low water-cement ratio by adding superplasticizer. After adding inert powder such as limestone powder, the low strength SCC can be produced. The dimension stability of SCC can be improved by using expansive agent. Mineral and inert admixture can reduce the hydrate heat of binder and avoid temperature crack of concrete. The durability of SCC can be improved by controlling water-cement ratio, adding chemical admixtures and fibre.
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Mukhopadhyay, A. K., K. Satya Prasad, Vikas Kumar, G. Madhusudhan Reddy, S. V. Kamat, and V. K. Varma. "Key Microstructural Features Responsible for Improved Stress Corrosion Cracking Resistance and Weldability in 7xxx Series Al Alloys Containing Micro / Trace Alloying Additions." Materials Science Forum 519-521 (July 2006): 315–20. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.315.
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The commercial 7xxx series Al alloys are based on medium strength Al-Zn-Mg and high strength Al-Zn-Mg-Cu systems. The medium strength alloys are weldable, whilst the high strength alloys are nonweldable. On the other hand, the Cu-free, weldable alloys suffer from poor SCC resistance. It is the purpose of this article to provide quantitative data and microstructural analysis to demonstrate that small additions of either Ag or Sc to Al-Zn-Mg and Al-Zn-Mg-Cu alloys bring about very significant improvement in SCC resistance and weldability, respectively. The improvement in SCC resistance of the Cu-bearing alloys due to over aging and retrogression and reaging (RRA) is further discussed in light of a similar improvement in the SCC resistance of these alloys, when peak aged, due to Ag and Sc additions.
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Karem Abd, Mohammed, and Zuhair Dhaher Habeeb. "Effect Of Specimen Size and Shape on Compressive Strength of Self-Compacting Concrete." Diyala Journal of Engineering Sciences 7, no. 2 (June 1, 2014): 16–29. http://dx.doi.org/10.24237/djes.2014.07202.
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This study aims to show the effect of specimen size and shape on compressive strength of self-compacting concrete (SCC). The work is divided into two parts, the first was to designed Normal Concrete (NC), High Strength Concrete (HSC) and Self Compacting Concrete (SCC) of strength between (25-70) MPa. from locally available materials. The values percent of cylinder to cube strength were between (0.86-0.9), (0.94-0.96), (0.96-0.99) of NC, HSC and SCC respectively.The second is to investigate the effect of specimen size on compressive strength, the values of correction factor of cube specimens (150*150*150)mm and (100*100*100)mm is (0.89-1.29), (0.98-1.26) and (0.98-1.22) of NC,HSC and SCC respectively. The values of correction factor of cylinder specimens of (150*300) mm and (100*200) mm is (0.88-1.08), (0.93-1.07) and (0.95-1.04) of NC, HSC and SCC respectively.
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Shen, Peng Fei, Yong Sheng Chen, Ling Li, Yin Ni, Na Zhao, and Wan Jing Luo. "Research and Evaluation of High Temperature Plugging Agent." Advanced Materials Research 750-752 (August 2013): 1685–88. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.1685.
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Superfine cement is an ideal grouting material of high-performance ultrafine particles. It has excellent permeability, higher strength and durability. One of the most important features of superfine cement is no pollution on environment. SHD and SCC are two kinds of cement which have different performance. Comparing particle size, initial setting time, compressive strength and plug rate of two kinds of superfine cement by experiment. The result of experiment shows that cement SCC has higher compressive strength and plug rate at higher temperatures.
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Budi, Agus Setiya, Endah Safitri, Senot Sangadji, and Stefanus Adi Kristiawan. "Shear Strength of HVFA-SCC Beams without Stirrups." Buildings 11, no. 4 (April 20, 2021): 177. http://dx.doi.org/10.3390/buildings11040177.
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Various concretes have been developed to meet the principles of sustainability. High volume fly ash-self compacting concrete (HVFA-SCC) is one example. The utilization of HVFA-SCC for structural applications, however, raises a concern among designers: that HVFA-SCC may not be as strong as conventional concrete when carrying shear forces. This concern is related to slow strength development and relatively smoother crack surface formation in HVFA-SCC, which, consequently, reduces the aggregate interlock mechanism contribution to the shear strength. In this respect, the design code for estimating the shear strength of HVFA-SCC may not be valid for the reason that the code was developed on the basis of the conventional concrete database. Previous research on the shear strength of HVFA-SCC was limited and no database can be extracted to justify the validity of the shear design code. This research was conducted to clarify the suitability of shear design code for HVFA-SCC. The research began with a limited laboratory investigation, followed by a numerical investigation to expand the range of results. Two types of HVFA-SCC beams with dimensions of 100 mm × 150 mm × 1700 mm were prepared, utilizing 50% and 60% fly ash. The shear behavior obtained from the laboratory investigations was then numerically modeled with the help of 3D ATENA Engineering software. The numerical model was used to explore the influence of reinforcement ratio, shear span to beam effective depth ratio, and beam size on the shear strength of the HVFA-SCC beam. The results were compared with the shear strength database of conventional and unconventional concrete beams to judge if the provisions in the design code can be applied to the shear design of an HVFA-SCC beam. The results confirm that the ACI shear design code is applicable for HVFA-SCC.
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Wulan, Soca Anggoro, Iman Satyarno, and Ashar Saputra. "Mix Design of Self Compacting Concrete Based on Ultra High Compressive Strength Flow Mortar Mix." Journal of the Civil Engineering Forum 4, no. 1 (January 14, 2018): 91. http://dx.doi.org/10.22146/jcef.29797.
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Mix design of Self Compacting Concrete or SCC is not straight forward because many parameters control its rheological properties. The case becomes more complicated if high compressive strength is also to be achieved. Therefore simpler approach is used, that is by firstly determining the flow mortar mix which is easier to be designed even with the requirement of ultra-high compressive strength. The mix design of SCC is then determined by simply adding the coarse aggregate with a certain amount of that mortar mix. In this research the ultra-high compressive strength flow mortar was made of Type I cement, 15% of cement weight silica fume, weight ratio of cement and curve No IV sand was 1: 0.35. The water-cementious ratio was 0.22 and the amount of plasticizer was 1.3%, 1.4%, 1.5% and 1.6% of the cement weight. For the SCC, the used coefficient was taken to be 1.4, 1.6, and 1.8 of the volume of that aggregate void for mortars, the aggregate value was at the volume of the remaining count of mortar and its size was 4.8 mm - 9.6 mm. Test results show that the mortar flow ability was 170 mm, 180 mm, 220 mm and 250 mm, where the achieved compressive strength was 83.1 MPa, 96.8 MPa, 111.4 MPa, and 135.5 MPa respectively. Mortar mix with 1.6% super plasticizer was then used for making the SCC and the results show that the concrete flow were 460 mm, 580 mm and 660 mm and the compressive strength were 88.2 MPa, 100.0 MPa, and 97.9 MPa. It can be concluded that using this simpler approach the SCC can have 580 mm flow and 100 MPa compressive strength
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Zhu, Junru, Chuntao Zhang, and Wei Yu. "Compressive Properties of Self-Compacting Concrete after Cooling from High Temperatures." Buildings 12, no. 11 (November 3, 2022): 1875. http://dx.doi.org/10.3390/buildings12111875.
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Self-compacting concrete (SCC) has been widely used in building structures. However, previous research focused only on the mechanical properties and working properties of SCC at room temperature. Thus, there is limited research on the change of compressive strength of SCC after a fire. This paper aims to investigate the compressive properties of SCC after being cooled from high temperatures. The SCC specimens were firstly heated to a target temperature of 100–700 °C and were then cooled to ambient temperatures by water or in air. The heating and cooling damage to the SCC specimens was assessed by the mass loss and the ultrasonic pulse velocity (UPV) separately. Afterward, the axial compression tests were carried out to investigate the compressive properties of the fire-affected SCC specimens under uniaxial compression. The residual mass, UPV, stress–strain curves, post-fire failure characteristics, and compressive strengths of the SCC specimens were discussed in detail. The mass loss of the SCC specimens showed an obvious increase with the rising temperatures, while the UPV exhibited a converse pattern. The mass loss of the SCC specimens after being naturally cooled increased more significantly, while the two cooling methods used in this experiment had little effect on the UPV. When the SCC specimens were cooled from 100 °C, the compressive strength of the SCC specimens cooled in air or water dropped by 32.54% and 35.15%, respectively. However, while the heating temperature rose to 700 °C, the compressive strengths of the SCC specimens cooled in air or water dropped sharply by 72.98% and 86.51%, respectively. Finally, an improved mathematical model for SCC after cooling from high temperatures was proposed based on Jones and Nelson’s equation. This improved material model matched the experimental results well, which demonstrates that the proposed constitutive model can provide better predictions for the SCC structures after a fire.
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Özcan, Fatih, and Halil Kaymak. "Utilization of Metakaolin and Calcite: Working Reversely in Workability Aspect—As Mineral Admixture in Self-Compacting Concrete." Advances in Civil Engineering 2018 (August 29, 2018): 1–12. http://dx.doi.org/10.1155/2018/4072838.
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In this work, utilization of metakaolin (MK) and calcite (C), working reversely in workability aspect, as mineral admixture in self-compacting concrete (SCC), was investigated. MK and C replaced cement in mass basis at various replacement ratios, separately and together. In total, 19 different SCCs were produced. Binder content and water to binder ratio were selected as 500 kg/m3 and 0.4, respectively. Workability tests including slump flow, T50, L-box, and V-funnel tests were performed. Consistency and setting times of binder paste were measured. While replacement of MK with cement increased the amount of plasticiser requirement, calcite worked reversely and decreased it. Reverse influence of MK and C on plasticiser requirement of SCC made possible to produce SCC at total 45% replacement ratio of MK and C together. Samples of SCC were cured in water at 20°C temperature. Compressive strengths of SCC samples were measured up to six months to evaluate the influence of MK and C, separately and together. Ultrasonic pulse velocity, abrasion, and capillary water absorption values of samples were determined at specified age. MK inclusion in concrete reduces workability, while C inclusion increases it. C and MK inclusion together remedied workability of concrete and enabled to produce SCC with high volume of admixtures. Furthermore, C incorporation increased one-day compressive strength, while MK incorporation reduced it in comparison with control concrete. In long term, C inclusion reduced compressive strength; however, MK inclusion increased it. C inclusion remedied one-day strength of concrete when it was used together with MK. MK inclusion remedied long-term compressive strength when it was used together with C and enabled to produce high-strength SCC with high volume of admixtures. SCC containing MK and C together showed better durability-related property.
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Benjeddou, Omrane, Herda Yati Katman, Malek Jedidi, and Nuha Mashaan. "Experimental Investigation of the High Temperatures Effects on Self-Compacting Concrete Properties." Buildings 12, no. 6 (May 27, 2022): 729. http://dx.doi.org/10.3390/buildings12060729.
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Self-compacting concrete (SCC), which appeared in the 1980s in Japan, is a concrete that differs from others by its high fluidity. The constituents of SCC can be quite different from those of ordinary concretes. They can differ both in their proportions and in their choice. Given the method of installation of SCCs, particular attention is paid to the study of their physical and mechanical characteristics. In this context, experimental tests were conducted to assess the effect of high temperatures on the behavior of SCC. For this purpose, a SCC and ordinary concrete (OC) were tested at temperatures of 20, 150, 300, 450, and 600 ∘C. Prismatic specimens of dimensions 100 × 100 × 400 mm3, cylindrical specimens of dimensions 160 × 320 mm, and parallelepiped specimens of dimensions 270 × 270 × 40 mm3 were prepared for physical (thermal conductivity) and mechanical (compressive strength, elastic modulus, flexural strength, and ultrasonic pulse velocity) tests. The results showed an increase in the compressive strength for SCC between 150 and 300 ∘C following an additional hydration of the cementitious matrix. The residual flexural strength of the concretes decreases progressively with the increase in temperature. This reduction is about 90% from 450 ∘C to 600 ∘C. The results also showed that the thermal conductivity of concrete decreases as the temperature increases and can reach a value of 1.2 W/mK for the heating temperature of 600 ∘C.
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Khed, Veerendrakumar C., Vyshnavi Pesaralanka, Musa Adamu, Yasser E. Ibrahim, Marc Azab, Achyutha Kumar Reddy, Ahmad Hakamy, and Ahmed Farouk Deifalla. "Optimization of Graphene Oxide Incorporated in Fly Ash-Based Self-Compacting Concrete." Buildings 12, no. 11 (November 17, 2022): 2002. http://dx.doi.org/10.3390/buildings12112002.
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Self-compacting concrete (SCC) was developed to overcome the challenges of concrete placement in dense or congested reinforcement structure, where the concrete can flow under its own weight to fill the densely reinforced structure. However, production of SCC mostly involves the use of high cement to achieve the desired strength. Therefore, to reduce the needed amount of cement, pozzolanic materials such as fly ash can be used to partially replace cement. However, fly ash has been reported to decrease the strengths of concrete especially at early ages. In this study, a self-compacting concrete (SCC) was developed with fly ash as a basic replacement material considering the efficiency of fly ash and incorporating graphene oxide (GO) as a cement additive to counteract the negative effect of fly ash. Response surface methodology (RSM) was utilized for designing the experiments, investigating the effects of fly ash and GO on SCC properties, and developing mathematical models for predicting mechanical properties of SCC. The ranges of fly ash and graphene oxide were 16.67 to 35% and zero to 0.05%, respectively. Statistical analysis was performed by using Design Expert software (version 11.0, Stat Ease Inc., Minneapolis, MS, USA). The results showed that fly ash had a positive effect while GO had a negative effect on the workability of SCC. The incorporation of fly ash alone decreased the compressive strength (CS), splitting tensile strength (STS) and flexural strength (FS), and additionally, increased the porosity of SCC. The addition of GO to fly ash-based SCC reduced its porosity and enhanced its mechanical strengths which was more pronounced at early ages. The developed models for predicting the mechanical strengths of fly ash-based SCC containing GO have a very high degree of correlation. Therefore, the models can predicts the strengths of SCC using fly ash and GO as the variables with a high level of accuracy. The findings show that based on the EFNARC guidelines, up to 35% of fly ash can be used to replace cement in SCC to achieve a mix with satisfactory flowability and deformability properties
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Serraye, Mahmoud, Said Kenai, and Bakhta Boukhatem. "Prediction of Compressive Strength of Self-Compacting Concrete (SCC) with Silica Fume Using Neural Networks Models." Civil Engineering Journal 7, no. 1 (January 1, 2021): 118–39. http://dx.doi.org/10.28991/cej-2021-03091642.
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Self-Compacting Concrete (SCC) is a relatively new type of concrete with high workability, high volume of paste and containing cement replacement materials such as slag, natural pozzolana and silica fume. Cement replacement materials provide a wide variety of benefits such as lower cost, reduced consumption of natural resources, reduced carbon dioxide emissions and improved fresh and hardened properties. SCC is used in many applications such as sections with congested reinforcement and high rise shear walls and there is a need for the prediction of the performance of SCC used. Artificial Neural networks (ANN) are widely used in civil engineering for the prediction of the performance of some engineering materials such as compressive strength and durability. However, currently, studies on SCC containing silica fume are very rare. In this paper, an artificial neural networks (ANN) model is developed to predict the compressive strength of SCC with silica fume using the Levenberg-Marquardt back propagation algorithm based on a database from 366 experimental studies. The model developed was correlated with a nonlinear relationship between the constituents (input) and the compressive strength of SCC (output). To evaluate the predictive ability and generalize the developed model, other researchers’ experimental results were compared with the model prediction and good agreements are found. A parametric study was conducted to study the sensitivity of the ANN proposed model to some parameters such as water/binder ratio and superplasticizer content. The model developed in this study can potentially be used for SCC compressive strength prediction with very acceptable results and a high correlation coefficient R2=0.93. The developed model is practical, easy to use and user friendly. Doi: 10.28991/cej-2021-03091642 Full Text: PDF
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Han, Li Zhong, and Shuo Qi Zhang. "Effects of Artificial Silica Fume on Compressive Strength and Workability of Self-Compacting Concrete." Advanced Materials Research 887-888 (February 2014): 842–49. http://dx.doi.org/10.4028/www.scientific.net/amr.887-888.842.
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The C60 self-compacting concrete (SCC) mixed artificial silica fume (ASF) and silica fume (SF) respectively were evaluated systematically through the items, such as compressive strength, slump loss, air content, and setting time, by which effect principles and mechanisms of ASF on compressive strength and workability of self-compacting concrete were obtained. The results indicate that ASF improves performances of fresh SCC better than SF, and it is a kind of high activity mineral mixture with high-early-strength.
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Riyana, M. S., Dhanya Sathyan, and M. K. Haridharan. "Effective Utilization of Industrial and Agricultural Waste for Developing Sustainable Self-Compacting Concrete." Materials Science Forum 1048 (January 4, 2022): 376–86. http://dx.doi.org/10.4028/www.scientific.net/msf.1048.376.
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SCC (Self compacting concrete) can fill formwork and encloses reinforcing bars under gravity and maintains homogeneity without vibration. SCC shortens the period of construction, guarantees compaction in confined zones, moreover terminates noise due to vibration. The wide spread application of SCC is restricted because of the high cost for the production of SCC with high cement content and chemical admixtures. In order to make the production of SCC economical, and to reduce the high cement content the Ordinary Portland Cement in SCC can be blended with pozzolanic materials like rice husk ash and supplementary cementitious materials like fly ash. In this paper the fresh state properties and mechanical properties such as compressive strength, split tensile strength and flexural strength of SCC with ternary blends of rice husk ash (RHA) and fly ash (FA) were studied. For this purpose, different mixes were prepared by replacing Ordinary Portland Cement (OPC) with 5%, 10%, 15% and 20% of rice husk ash (RHA) and the percentage of addition of fly ash (FA) is fixed as 15% for all these mixes. It was observed that the specimen incorporating 10% of rice husk ash (RHA) and 15% of fly ash (FA) as ternary blend exhibits better mechanical properties such as: Compressive, split tensile and flexural strengths at 28 days of age as compared to traditional mix of SCC without RHA (Rice Husk Ash) and FA (Fly Ash). This research demonstrates that the ideal percentage for a mixture of rice husk ash (RHA) and fly ash as ternary blend is 10% and 15% respectively.
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Chunchu, Bala, and Jagadeesh Putta. "Rheological and Strength Behavior of Binary Blended SCC Replacing Partial Fine Aggregate with Plastic E-Waste as High Impact Polystyrene." Buildings 9, no. 2 (February 22, 2019): 50. http://dx.doi.org/10.3390/buildings9020050.
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Disposing electronic plastic waste into construction materials is an eco-friendly and energy efficient solution to protect the environment. This work is aimed at enhancing the strength of self-compacting concrete (SCC) replacing sand with electronic waste, namely, High Impact polystyrene (HIPS) plastic granules and cementitious material with fly ash. SCC is designed with the optimized binder content of 497 kg/m3 using Fly Ash (30% by weight of cement) and 0.36 as water-to-binder ratio for all the mixtures. High Impact Polystyrene granules are replaced with sand up to 40% (by volume) at a regular interval of 10%. Rheological behavior is observed with the slump flow test for slump diameter, V-funnel test for flow time, and the L-box test for heights ratio, respectively. Strength behavior is studied by performing split tensile strength, and compressive strength tests after a period of 7, 28, and 90 days, respectively. Both fly ash and HIPS aggregate in addition to SCC up to 30% exhibits a minimal strength reduction with a promising performance in workability. Hence incorporation of both fly ash and HIPS granules up to 30% in SCC is a viable eco-friendly technique, with the beneficial economic impact on the construction industry.
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Aslani, Farhad, Fatemeh Hamidi, and Qilong Ma. "Fire Performance of Heavyweight Self-Compacting Concrete and Heavyweight High Strength Concrete." Materials 12, no. 5 (March 11, 2019): 822. http://dx.doi.org/10.3390/ma12050822.
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In this study, the fresh and hardened state properties of heavyweight self-compacting concrete (HWSCC) and heavyweight high strength concrete (HWHSC) containing heavyweight magnetite aggregate with 50, 75, and 100% replacement ratio, and their performance at elevated temperatures were explored experimentally. For fresh-state properties, the flowability and passing ability of HWSCCs were assessed by using slump flow, T500 mm, and J-ring tests. Hardened-state properties including hardened density, compressive strength, and modulus of elasticity were evaluated after 28 days of mixing. High-temperature tests were also performed to study the mass loss, spalling of HWSCC and HWHSC, and residual mechanical properties at 100, 300, 600 and 900 °C with a heating rate of 5 °C/min. Ultimately, by using the experimental data, rational numerical models were established to predict the compressive strength and modulus of elasticity of HWSCC at elevated temperatures. The results of the flowability and passing ability revealed that the addition of magnetite aggregate would not deteriorate the workability of HWSCCs and they retained their self-compacting characteristics. Based on the hardened densities, only self-compacting concrete (SCC) with 100% magnetite content, and high strength concrete (HSC) with 75 and 100% magnetite aggregate can be considered as HWC. For both the compressive strength and elastic modulus, decreasing trends were observed by introducing magnetite aggregate to SCC and HSC at an ambient temperature. Mass loss and spalling evaluations showed severe crack propagation for SCC without magnetite aggregate while SCCs containing magnetite aggregate preserved up to 900 °C. Nevertheless, the mass loss of SCCs containing 75 and 100% magnetite content were higher than that of SCC without magnetite. Due to the pressure build-up, HSCs with and without magnetite showed explosive spalling at high temperatures. The residual mechanical properties analysis indicated that the highest retention of the compressive strength and modulus of elasticity after exposure to elevated temperatures belonged to HWSCC with 100% magnetite content.
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Dietzel, Wolfgang, Michael Pfuff, and Guido G. Juilfs. "Studies of SCC and Hydrogen Embrittlement of High Strength Alloys Using Fracture Mechanics Methods." Materials Science Forum 482 (April 2005): 11–16. http://dx.doi.org/10.4028/www.scientific.net/msf.482.11.
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Fracture mechanics based test and evaluation techniques are used to gain insight into the phenomenon of stress corrosion cracking (SCC) and to develop guidance for avoiding or controlling SCC. Complementary to well known constant load and constant deflection test methods experiments that are based on rising load or rising displacement situations and are specified in the new ISO standard 7539 – Part 9 may be applied to achieve these goals. These are particularly suitable to study cases of SCC and hydrogen embrittlement of high strength steels, aluminium and titanium alloys and to characterise the susceptibility of these materials to environmentally assisted cracking. In addition, the data generated in such R-curve tests can be used to model the degradation of the material caused by the uptake of atomic hydrogen from the environment. This is shown for the case of a high strength structural steel (FeE 690T) where in fracture mechanics SCC tests on pre-cracked C(T) specimens a correlation between the rate of change in plastic deformation and the crack extension rate due to hydrogen embrittlement was established. The influence of plastic strain on the hydrogen diffusion was additionally studied by electrochemical permeation experiments. By modelling this diffusion based on the assumption that trapping of the hydrogen atoms takes place at trap sites which are generated by the plastic deformation, a good agreement was achieved between experimentally obtained data and model predictions.
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Tian, Shuai, Zhenbao Liu, Renli Fu, Chaofang Dong, and Xiaohui Wang. "Effect of Organizational Evolution on the Stress Corrosion Cracking of the Cr-Co-Ni-Mo Series of Ultra-High Strength Stainless Steel." Materials 15, no. 2 (January 10, 2022): 497. http://dx.doi.org/10.3390/ma15020497.
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Different microstructures were obtained under various thermal conditions by adjusting the heat treatment parameters of the Cr-Co-Ni-Mo series of ultra-high strength stainless steel. The effect of organizational evolution on the stress corrosion cracking (SCC) of the Cr-Co-Ni-Mo series of ultra-high strength stainless steel was investigated using potentiodynamic polarization curves, electrochemical impedance spectroscopy (EIS), transmission electron microscopy (TEM), scanning electron microscopy (SEM) and other test methods in combination with slow strain rate tensile tests (SSRTs). The results show that the Mo- and Cr-rich clusters and precipitation of the Laves phase reduce the corrosion resistance, while increasing the austenite content can improve the corrosion resistance. The Cr-Co-Ni-Mo series of ultra-high strength stainless steel has a high SCC resistance after quenching at 1080 °C and undergoing deep cooling (DC) treatment at −73 °C. With increasing holding time, the strength of the underaged and peak-aged specimens increases, but the passivation and SCC resistance decreases. At the overaged temperature, the specimen has good SCC resistance after a short holding time, which is attributed to its higher austenite content and lower dislocation density. As a stable hydrogen trap in steel, austenite effectively improves the SCC resistance of steel. However, under the coupled action of hydrogen and stress, martensitic transformation occurs due to the decrease in the lamination energy of austenite, and the weak martensitic interface becomes the preferred location for crack initiation and propagation.
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Chu, Tongjiao, Haichao Cui, and Fenggui Lu. "The Effect of Microstructure on Stress Corrosion CrackingGrowth Rates of LowAlloy High Strength Steel Welded Joint." MATEC Web of Conferences 269 (2019): 03006. http://dx.doi.org/10.1051/matecconf/201926903006.
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The correlation of multi-microstructure and stress corrosion sensitivity based on the low alloy high strength steel welded joint was systematically studied in NaCl solution at the hightemperature. Through comparatively measuring the stress corrosion crack (SCC) rate in the different area of base metal (BM) and weld metal (WM) respectively, the SCC resistance in welded joint was evaluated and analysed. The SCC test indicated that the WM presented a lower crack growth rate (CGR) compared to the BM. The reason for that was mainly ascribed to the columnar of WM that impeded the crack growth in the vertical direction of stress. Meanwhile, the interwoven microstructure of nonparallel ferrite strips and fine acicular ferrite in the WM led to the zigzag propagated path and decreased the CGR.
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Yang, Qingguo, Nan Ru, Xuefeng He, and Yi Peng. "Mechanical Behavior of Refined SCC with High Admixture of Hybrid Micro- and Ordinary Steel Fibers." Sustainability 14, no. 9 (May 7, 2022): 5637. http://dx.doi.org/10.3390/su14095637.
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The addition of steel fiber to self-consolidating concrete (SCC) may considerably prolong concrete cracking time and improve its deforming performance. Current studies mainly apply high content micro-steel fibers to improve the mechanical performance of SCC whilst assuring its workability, however, there are still very few studies concerning the influence of a mixture of a high content of micro-steel fibers with ordinary steel fibers on the performance of SCC. Thus, this paper conducted experimental studies on micro-steel fiber and ordinary-sized steel fiber hybrid reinforced self-consolidating concrete (MOSCC). Plain self-consolidating concrete (PSCC), micro-steel fiber reinforced self-consolidating concrete (MSCC), and ordinary-sized steel fiber reinforced self-consolidating concrete (OSCC) are proposed for comparison with MOSCC in respects of workability and mechanical performance. Test results show that the hybrid micro-steel fiber and ordinary steel fiber highly enhance the compressive strength, flexural strength, and ductility of SCC as well as maintaining its workability. This paper provides reference to the improvement of the mechanical performance of SCC material and the enhancement of crack resistance of concrete structures.
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Shafiq, Nasir, Muhd Fadhil Nuruddin, Ahmed Fathi Mohamed Salih, and Ali Elheber Ahmed Elshekh. "Characterization of Stand Chopped Basalt Fiber Self – Compacting Reinforced Concrete (SCB-SCC)." Applied Mechanics and Materials 567 (June 2014): 356–61. http://dx.doi.org/10.4028/www.scientific.net/amm.567.356.
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In the world today, producers of high performance concrete usually look for locally available material to provide low cost concrete. To reduce the total cost of concrete, it is recommended to use a mineral admixture by replacing the cement content while the improvement in the strength of concrete can be achieved by implementing the fibers as a discrete material in the concrete mix. Within this study, a attempt has been given to analyze the properties of self-compacting concrete (SCC) with microwave incinerated rice husk ash (MIRHA) and fly ash as a two types of filler. This was to enhance the properties of SCC with the Stand Chopped Basalt (SCB) fiber having been added to the concrete mix. The experimental work was a fresh and a hardened test with the trend of the result showing the possibility to increase the properties of SCC by using MIRHA and SCB fiber.
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Mezaal, Abdulrahman Mohammed, Khalid Battal Najim, and Ahmed Tareq Noaman. "Mechanical Properties of High Strength SCC Made with Hybrid Steel Fibers from Discarded Bead Wires." Key Engineering Materials 911 (February 24, 2022): 151–60. http://dx.doi.org/10.4028/p-259798.
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The tire manufacturing sector occupies a significant portion of the global economy. The production of vehicle tires requires the utilization of different raw and processed materials. Steel beads are one of these main ingredients, used to reinforce the treads and sidewalls of car tires. In this study, the effect of incorporating steel fibers cut from discarded bead wire (DBW) during the tire manufacturing process on the rheological, mechanical, and flexural toughness of high-strength self-compacting concrete (SCC) was investigated. Four SCC mixes were prepared with four discarded bead wires, at volume fractions of 0%, 0.3%, 0.6%, and 1%. Four lengths of the discarded bead wires were used in the term of hybridization: 10, 20, 30, and 35 mm. These were mixed together, with each length comprising 25% of the total. Investigations of fresh and hardened concrete properties were carried out. The results showed that discarded bead wires affected the rheological properties of the high-strength SCC adversely, causing a considerable reduction in slump flow and passing ability and an increase in T500 and V-funnel time, and enhancing segregation resistance. On the other hand, the mechanical properties, such as compressive strength and splitting tensile strength were improved significantly with the inclusion of the discarded bead wire. Moreover, investigations of flexural toughness based on ASTM requirements were conducted. Overall, the presence of different lengths of the discarded bead wire helped to transfer the load from the cementitious matrix to the short fibers, and then to the long ones, leading to the enhanced energy absorption capacity of high-strength SCC.
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Liu, Pan, Ran Hai, Junxia Liu, and Zhiquan Huang. "Mechanical Properties and Axial Compression Deformation Property of Steel Fiber Reinforced Self-Compacting Concrete Containing High Level Fly Ash." Materials 15, no. 9 (April 26, 2022): 3137. http://dx.doi.org/10.3390/ma15093137.
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The cement industry has brought serious environmental pollution problems. In the background of ecological civilization, accelerating rational use of waste resources plays an important role in protecting the environment. In this study, self-compacting concrete (SCC) is prepared using fly ash and lime powder as supplementary cementitious materials by replacing 50%, 60%, and 70% of ordinary Portland cement. By systematically analyzing the influence of the fly ash replacement rate on the workability and mechanical properties of SCC, steel-fiber-reinforced SCC containing 60% fly ash is chosen for further study, and steel fiber is added at the percentages of 0.25%, 0.50%, 0.75%, and 1.00%. The performances in fresh and hardened states are investigated in terms of workability, compressive strength, splitting tensile strength, flexural strength, and axial compression deformation property. The obtained outcomes indicate that although the incorporation of fly ash can improve the workability of the mixture, there is a negative correlation between the mechanical properties of SCC and the fly ash replacement rate. For steel-fiber-reinforced SCC containing 60% fly ash, when the content of steel fibers exceeds 0.75%, the workability decreases sharply, and even when the volume fraction is 1.00%, the passing ability cannot meet the requirements of the technical specifications for applications of self-compacting concrete. The analysis results for mechanical properties show that compressive strength is not changed significantly with increasing percentage of steel fibers. The steel fibers strengthen splitting tensile strength and flexural strength significantly, and compared with that of without steel fibers, they increased by 22% and 58%, respectively, with steel fibers up to 1.00%. Additionally, the parameters of the axial compression deformation property are improved by introducing steel fibers, especially the strain energy (Vε) and relative toughness (Γ) of steel-fiber-reinforced SCC containing a high level of fly ash.
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Liu, Pan, Ran Hai, Junxia Liu, and Zhiquan Huang. "Mechanical Properties and Axial Compression Deformation Property of Steel Fiber Reinforced Self-Compacting Concrete Containing High Level Fly Ash." Materials 15, no. 9 (April 26, 2022): 3137. http://dx.doi.org/10.3390/ma15093137.
Full textAbstract:
The cement industry has brought serious environmental pollution problems. In the background of ecological civilization, accelerating rational use of waste resources plays an important role in protecting the environment. In this study, self-compacting concrete (SCC) is prepared using fly ash and lime powder as supplementary cementitious materials by replacing 50%, 60%, and 70% of ordinary Portland cement. By systematically analyzing the influence of the fly ash replacement rate on the workability and mechanical properties of SCC, steel-fiber-reinforced SCC containing 60% fly ash is chosen for further study, and steel fiber is added at the percentages of 0.25%, 0.50%, 0.75%, and 1.00%. The performances in fresh and hardened states are investigated in terms of workability, compressive strength, splitting tensile strength, flexural strength, and axial compression deformation property. The obtained outcomes indicate that although the incorporation of fly ash can improve the workability of the mixture, there is a negative correlation between the mechanical properties of SCC and the fly ash replacement rate. For steel-fiber-reinforced SCC containing 60% fly ash, when the content of steel fibers exceeds 0.75%, the workability decreases sharply, and even when the volume fraction is 1.00%, the passing ability cannot meet the requirements of the technical specifications for applications of self-compacting concrete. The analysis results for mechanical properties show that compressive strength is not changed significantly with increasing percentage of steel fibers. The steel fibers strengthen splitting tensile strength and flexural strength significantly, and compared with that of without steel fibers, they increased by 22% and 58%, respectively, with steel fibers up to 1.00%. Additionally, the parameters of the axial compression deformation property are improved by introducing steel fibers, especially the strain energy (Vε) and relative toughness (Γ) of steel-fiber-reinforced SCC containing a high level of fly ash.
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Rama Krishna Rao, A., N. Ruben, V. Reddy Srinivasa, and S. V. S. Sankeerth. "Development of hybrid fibre reinforced self-compacting concrete as per Nan Su criteria." E3S Web of Conferences 309 (2021): 01050. http://dx.doi.org/10.1051/e3sconf/202130901050.
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This paper studies the development of hybrid fibre reinforced self-compacting concrete as per Nan Su criteria. Results predicted that various packing factors adopted in the study are 1.12, 1.14, 1.16 and 1.18. Fine aggregate /Total aggregate ratios (s/a ratio) adopted in the study are 0.5, 0.53 and 0.57. The optimum combinations of packing factor and s/a ratio are found to be 1.12 & 0.53 and 1.14 & 0.57 for M30 grade SCC mixes because these optimum PF and s/a ratio combination gives comparatively better particle packing density in SCC mixes. Better particle packing density enhances the microstructure of SCC mix subsequently more strength and durability can be achieved. As PF increases powder content decreases and aggregate content increases requiring more paste to make the SCC mix workable. Less value PF will have high particle packing density yielding more strength due to improved microstructure of SCC mixes. At PF & s/a combinations of 1.12 & 0.53 and 1.14 & 0.57, the workability of SCC mixes is superior because of high paste volume and less aggregate content. Compressive, split-tensile and flexural of M30 grade SCC mixes made with optimum combinations of packing factor and s/a ratios are found to be high.
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Canbaz, Mehmet, and Erman Acay. "Effect of high temperature on SCC containing fly ash." Challenge Journal of Concrete Research Letters 12, no. 1 (March 12, 2021): 1. http://dx.doi.org/10.20528/cjcrl.2021.01.001.
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The effect of high temperature on self-compacting concrete, which contains different amounts of fly ash, has been investigated. By considering the effect of concrete age and increased temperatures, the optimum fly ash-cement ratio for the optimum concrete strength is determined using experimental studies. Self-compacting concrete specimens are produced, with fly ash/cement ratios of 0%, 20% and 40%. Specimens were cured for 28, 56 and 90 days. After curing was completed, the specimens were subjected to temperatures of 20°C, 100°C, 400°C, 700°C and 900°C for three hours. After the cooling process, tests were performed to determine the unit weight, ultrasonic pulse velocity and compressive strength of the specimens. According to the experiment results, an increase in fly ash ratio causes a decrease in the compressive strength of self-compacting concrete. However, it positively contributes to self-compaction and strength loss at high temperatures. The utilization of fly ash in concrete significantly contributes to the environment and the economy. For this reason, the addition of 20% fly ash to concrete is considered to be effective.
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Cottis, R. A., and C. A. Loto. "Electrochemical Noise Generation during SCC of a High-Strength Carbon Steel." CORROSION 46, no. 1 (January 1990): 12–19. http://dx.doi.org/10.5006/1.3585059.
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Samabangi, Arunchaitanya, and Arunakanthi Eluru. "Industrial copper waste as a sustainable material in high strength SCC." Cleaner Engineering and Technology 6 (February 2022): 100403. http://dx.doi.org/10.1016/j.clet.2022.100403.
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Wu, Ling-fei, Song-mei Li, Jian-hua Liu, and Mei Yu. "SCC evaluation of ultra-high strength steel in acidic chloride solution." Journal of Central South University 19, no. 10 (October 2012): 2726–32. http://dx.doi.org/10.1007/s11771-012-1333-6.
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Ahmed, Ghafur H. "Influence of Mixture Proportions on Fresh and Mechanical Properties of Self-consolidating Concrete." Polytechnic Journal 11, no. 2 (December 30, 2021): 17–25. http://dx.doi.org/10.25156/ptj.v11n2y2021.pp17-25.
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Self-consolidating concrete (SCC) is a concrete that able to flow and consolidate under its own weight, and it is cohesive enough to fill spaces of almost any size and shape without segregation or bleeding. In this study, workability and strength characteristics of seven SCC mixes were examined and compared with two additional vibrated mixes of normal and high strength. For this purpose, the flowability, deformability, and passing ability of fresh concrete mixes were tested through slump test, slump flow, T500, and the J-ring tests. Furthermore, the hardened concrete specimens were tested for mechanical properties with the variation in shape and size of the specimens at six different ages. The results revealed that addition of micro-silica is more effective in improving concrete workability and strength than blended micro-silica and fly ash. A well-designed SCC could have an excellent flow (730 mm) and passing ability (ΔH = 4 mm), without sacrificing the early strength (22.3 MPa in 1 day), or long-term strength (107.7 MPa in 90 days). Results also showed that the compressive strength and the tensile strength of SCC mixes were less affected by specimen shape and size compared to conventional concrete mixes.
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Abbas, Zena K., Ahlam A. Abbood, and Raghad S. Mahmood. "Producing low-cost self-consolidation concrete using sustainable material." Open Engineering 12, no. 1 (January 1, 2022): 850–58. http://dx.doi.org/10.1515/eng-2022-0368.
Full textAbstract:
Abstract The disposal of the waste material is the main goal of this investigation by transformation to high-fineness powder and producing self-consolidation concrete (SCC) with less cost and more eco-friendly by reducing the cement weight, taking into consideration the fresh and strength properties. The reference mix design was prepared by adopting the European guide. Five waste materials (clay brick, ceramic, granite tiles, marble tiles, and thermostone blocks) were converted to high-fine particle size distribution and then used as 5, 10, and 15% weight replacements of cement. The improvement in strength properties is more significant when using clay bricks compared to other activated waste ceramics and granite tiles. The percentage increases to 11.59% at 28 days for compressive strength when using 10% replacement of cement weight. The ability to produce eco-SCC with less cement content and lower cost consumption is encouraged, although the enhancement in strength is not high since the waste can be disposable. While the percentage reduction in the strength of SCC mixes containing marble tile or thermostone block powder increases with the replacement of cement weight with a greater need for superplasticizer justification, we recommend using 5% as a replacement by weight of cement with an insignificant retardation of strength. Finally, there is a good relationship between compressive strength and ultrasonic pulse velocity and between tensile and flexural strength with a high R 2.
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Boukhelkhal, Aboubakeur, and Said Kenai. "Assessment of fluidity retention, mechanical strength and cost production of blended cement self-compacting concrete using the concept of a performance index." Frattura ed Integrità Strutturale 16, no. 60 (March 25, 2022): 89–101. http://dx.doi.org/10.3221/igf-esis.60.07.
Full textAbstract:
Construction industry consumes a large amount of natural resources and energy and produces high amount of CO2 emissions and waste materials. For more sustainable construction industry, various waste materials are used as natural aggregates substitution or as cement replacement materials. In this paper, marble powder (MP) is used as a substitution to ordinary Portland cement and its effects on some fresh and hardened properties of self-compacting concrete (SCC) are investigated. The tests at the fresh state were slump flow, L-box and sieve segregation. To assess the fluidity retention, slump flow loss was measured after 30, 60 and 90 minutes. At hardened state, two tests were realized: compressive strength and static segregation. The results indicate that adding MP improved the fresh properties, but decreased the compressive strength of SCC. Adding MP allows to maintain the fluidity of SCC until 90 minutes. Production cost can be reduced by using MP. The performance approach showed that a substitution level of MP of 20% is adequate to produce an eco-efficient SCC with high fluidity and acceptable strength.