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Academic literature on the topic 'Hook-end steel fibers (SF)'
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Journal articles on the topic "Hook-end steel fibers (SF)"
1
Pallepati, Rupa, Kumar. K. Sunil, and Axetha Menam. "Experimental Study on the Strengthening Properties of Rubber Concrete with Hook End Steel Fibers." International Journal of Recent Technology and Engineering (IJRTE) 9, no. 4 (2020): 426–30. https://doi.org/10.35940/ijrte.D5052.119420.
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The fast development of automobile sector, removal of discarded waste elastic is turning into a broad ecological problem. In the current work, exertion has been made to limit this problem By using scrap elastic as the scrap (morsel) concrete rubber in various percentages, as a partial replacement for the fine aggregates. In this paper, the mechanical properties of rubberized concrete with steel fibre (RSFC) are studied experimentally. This article discussed the effect by volume of concrete (5, 7.5 and 10 per cent rubber) and (0.8.0.1 and 1.2 per cent steel fibre) on the reinforcement of the properties of rubberized concrete with steel fibres (RSFC) of scrap crumb rubber (SCR) and steel fibre (SF) with different steel substances. The literature survey suggests that there is a substantial decline in strengths of the single morsel rubber used in traditional concrete. like compressive, tensile and flexural strength therefore to overcome this problem by using steel fibers in present investigation and from the results it can be finalized that the all the strengthening properties (compressive, tensile strength and flexural strength) are increased contrasted with rubberized concrete but still test values are inferior than conventional concrete due to fineness of crumb rubber and irregular shape of hook end steel fiber.
2
Magbool, Hassan M., and Abdullah M. Zeyad. "The effect of varied types of steel fibers on the performance of self-compacting concrete modified with volcanic pumice powder." Materials Science-Poland 39, no. 2 (2021): 172–87. http://dx.doi.org/10.2478/msp-2021-0016.
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Abstract The aim of this work involves studying the impact of varied types of steel fibers (SF) on the performance of self-compacting concrete (SCC), containing volcanic pumice powder (VPP). In this study, five types of steel fiber, which had a hooked end with two lengths of (SF1) and (SF3), flat end of length (SF2), in addition to the pointed end of (SF4) and (SF5) by 1% of volume fraction, were used. In addition, hybrid steel fiber (a mixture of all the steel fiber types) by 0.2% of volume fraction of concrete volume was used. Moreover, VPP was utilized by 30% cement mass as a substitute material for producing SCC. The impact of steel fiber properties in the shape of SF on the fresh concrete properties as slump flow and segregation were investigated. In addition to their influence on the compressive strength, split tensile strength, flexural strength, toughness, porosity, water absorption, and bulk density were examined. The results showed that SF led to decreasing the SCC fresh properties. Utilizing SF, on the other hand, improved the SCC hardened properties, as well as the toughness indices.
3
Jahandari, Soheil, Masoud Mohammadi, Aida Rahmani, et al. "Mechanical Properties of Recycled Aggregate Concretes Containing Silica Fume and Steel Fibres." Materials 14, no. 22 (2021): 7065. http://dx.doi.org/10.3390/ma14227065.
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In this study, the impact of steel fibres and Silica Fume (SF) on the mechanical properties of recycled aggregate concretes made of two different types of Recycled Coarse Aggregates (RCA) sourced from both low- and high-strength concretes were evaluated through conducting 60 compressive strength tests. The RCAs were used as replacement levels of 50% and 100% of Natural Coarse Aggregates (NCA). Hook-end steel fibres and SF were also used in the mixtures at the optimised replacement levels of 1% and 8%, respectively. The results showed that the addition of both types of RCA adversely affected the compressive strength of concrete. However, the incorporation of SF led to compressive strength development in both types of concretes. The most significant improvement in terms of comparable concrete strength and peak strain with ordinary concrete at 28 days was observed in the case of using a combination of steel fibres and SF in both recycled aggregate concretes, especially with RCA sourced from high strength concrete. Although using SF slightly increased the elastic modulus of both recycled aggregate concretes, a substantial improvement in strength was observed due to the reinforcement with steel fibre and the coexistence of steel fibre and SF. Moreover, existing models to predict the elastic modulus of both non-fibrous and fibrous concretes are found to underestimate the elastic modulus values. The incorporation of SF changed the compressive stress-strain curves for both types of RCA. The addition of steel fibre and SF remarkably improved the post-peak ductility of recycled aggregates concretes of both types, with the most significant improvement observed in the case of RCA sourced from a low-strength parent concrete. The existing model to estimate the compressive stress-strain curve for steel fibre-reinforced concrete with natural aggregates was found to reasonably predict the compressive stress-strain behaviour for steel fibres-reinforced concrete with recycled aggregate.
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Mzher, Ahmed, and Ali Abd Sultan. "Effects of Steel Fiber Content and Maximum Coarse Aggregate Size on Mechanical Properties of Steel Fiber Reinforced Concrete." University of Thi-Qar Journal for Engineering Sciences 14, no. 1 (2024): 107–19. https://doi.org/10.31663/utjes.14.1.669.
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This research highlights the synergistic impact of including varying steel fiber contents and size of coarse aggregate on the concrete's mechanical characteristics, including compression strength, workability, splitting tensile strength, and stress-strain correlations under compression stress. The study investigated steel fiber percentages ranging from 0% to 2% with increments of 0.5% and coarse aggregate maximum sizes, namely (9.5mm, 12.5mm and 19mm). The study entailed the production and examination of a total of fifteen concrete samples, comprising three cubes and two cylinders for each concrete mixture. The results demonstrated that the compressive strength of concrete mixes lacking steel fibers shows a positive relationship with the largest size of coarse aggregate. However, the inclusion of steel fibers causes a reduction in compressive strength as the maximum size of coarse aggregate increases. Finer coarse aggregate sizes resulted in the highest tensile strength. Moreover, the study showed that including hooked-end steel fibers (SF) enhances the stiffness of concrete cylinders and allows for deformation without fracture. And, the influence of maximum coarse aggregate size on stress-strain behavior is negligible. These findings emphasize the significance of taking into account both the overall size and the inclusion of SF in mixes of concrete to improve the compressive and tensile strength, stress-strain responses, and overall performance.
5
Yavas, Altug, and Cumali Ogun Goker. "Impact of Reinforcement Ratio on Shear Behavior of I-Shaped UHPC Beams with and without Fiber Shear Reinforcement." Materials 13, no. 7 (2020): 1525. http://dx.doi.org/10.3390/ma13071525.
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In the presented paper, the impacts of steel fiber use and tensile reinforcement ratio on shear behavior of Ultra-High Performance Concrete (UHPC) beams were investigated from the point of different tensile reinforcement ratios. In the scope of the experimental program, a total of eight beams consisting of four reinforcement ratios representing low to high ratios ranged from 0.8% to 2.2% were casted without shear reinforcement and subjected to the four-point loading test. While half of the test beams included 30 mm end-hooked steel fibers (SF-UHPC) with 2.0 vol%, the remaining beams were produced without the fiber to show possible effectiveness of the fiber use. The shear performances were discussed in terms of the load—deflection response, cracking pattern and failure mode, first cracking load and ultimate shear strength. In this sense, all the non-fiber beams were failed by shear with a dramatic load drop, regardless of the tensile reinforcement amount, before the yielding of reinforcement and they produced no deflection capability. The test results showed that while the inclusion of steel fibers to the UHPC mixture with low reinforcement ratios changed the failure mode from the shear to flexure, it significantly enhanced the ultimate shear strength in the case of higher reinforcement ratio through the SF-UHPC’ superior mechanical properties and fibers’ crack-bridging ability.
6
Li, Jiuyang, Jingwei Luo, Xinmei Fan, et al. "Split-tensile strength and micro-structure analysis of hybrid fibers coal gangue concrete." Journal of Physics: Conference Series 2808, no. 1 (2024): 012087. http://dx.doi.org/10.1088/1742-6596/2808/1/012087.
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Abstract To make the coal gangue better applied and engineered, through four factors (Coal gangue ceramicist [CGc] Substitution, coal gangue ceramic sand [CGs] Substitution, end-hooked steel fiber [SF], polypropylene fiber [PF]) four-level orthogonal test was conducted to explore the variation of Split-tensile strength of mixed-fiber coal gangue concrete and the strengthening mechanism of hybrid fiber on split-tensile strength of Coal-gangue concrete is analyzed from the microscopic point of view. The results show that the sequence of factors affecting the split-tensile strength is substitution rate of CGs > substitution rate of CGc > incorporation amount of SF > incorporation amount of PF. The optimal admixture combination is: CGc substitution rate of 30%, CGs substitution rate of 25%, SF incorporation rate of 1.00%, and PF incorporation rate of 0.2%. The spatial framework formed by hybrid fibers can enhance the stability of the ITZ to bond inner material tightly, thus enhancing the split-tensile strength of concrete.
7
Anbazhagan, Rajesh, Karthikeyan Arunachalam, and Sumathi Arunachalam. "Self-healing evaluation of bacteria grouted light weight aggregate concrete containing rice husk ash and steel fibers." Revista de la construcción 23, no. 1 (2024): 16–30. http://dx.doi.org/10.7764/rdlc.23.1.16.
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Utilization of microbiologically induced calcite precipitation along with fiber composite have great influence on improving strength and durable properties of concrete. The concept of mechanical properties of grouted concrete added with bacteria, steel fibers (SF), rice husk ash (RHA) and light weight aggregate (LWA) has been focused on this work. In the fabrication of concrete specimens, concentration of bacteria, combination of steel fibers and LWA was placed in the formwork, and to fill the voids flowable grout was injected. The variables studied in this work are two different sizes of LWA viz., 10 mm and 12.5 mm with constant dosage of 2% hooked end steel fibers by volume of concrete, 10% RHA was used as cement replacement for preparation of grout and bacteria was incorporated in cement grout by direct application. The properties such as compressive strength (CS), compressive strength regain (CSR), crack width healing, impact strength for first crack and final failure, rate of healing was studied for pre-cracked specimens using visual and microscopic observation. In addition, microstructure was studied for grouted concrete without bacteria and with bacteria under immersed curing conditions. From the experimental results, performance of bacteria added grouted concrete properties such as CS, CSR, cracking healing capacity, and impact strength has improved with the addition of fibers.Utilization of microbiologically induced calcite precipitation along with fiber composite have great influence on improving strength and durable properties of concrete. The concept of mechanical properties of grouted concrete added with bacteria, steel fibers (SF), rice husk ash (RHA) and light weight aggregate (LWA) has been focused on this work. In the fabrication of concrete specimens, concentration of bacteria, combination of steel fibers and LWA was placed in the formwork, and to fill the voids flowable grout was injected. The variables studied in this work are two different sizes of LWA viz., 10 mm and 12.5 mm with constant dosage of 2% hooked end steel fibers by volume of concrete, 10% RHA was used as cement replacement for preparation of grout and bacteria was incorporated in cement grout by direct application. The properties such as compressive strength (CS), compressive strength regain (CSR), crack width healing, impact strength for first crack and final failure, rate of healing was studied for pre-cracked specimens using visual and microscopic observation. In addition, microstructure was studied for grouted concrete without bacteria and with bacteria under immersed curing conditions. From the experimental results, performance of bacteria added grouted concrete properties such as CS, CSR, cracking healing capacity, and impact strength has improved with the addition of fibers.
8
Hameed, Irfan Talib, and Ali Al-Dahawi. "Electro-mechanical Properties of Functional Fiber-Based Rigid Pavement under Various Loads Applied on a Large-Scale in-Situ Section." E3S Web of Conferences 427 (2023): 03033. http://dx.doi.org/10.1051/e3sconf/202342703033.
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Highways play a critical role in development plans worldwide, as they significantly impact people's daily lives. Monitoring vehicle weights can enhance road lifespan, improve efficiency, and reduce maintenance costs. Self-sensing concrete has emerged as a groundbreaking technology for real-time monitoring structures and infrastructures, including rigid pavement. By incorporating electrically conductive materials (ECMs), this type of concrete can detect and measure load magnitudes. An experimental study investigated the electro-mechanical properties of rigid pavement under various types of loads using chopped carbon fiber (CCF) and macro-end hook steel fiber (SF) on a large-scale in situ section. The applied loads were represented by trucks classified according to Iraqi standards. The study revealed that as the applied loads on the test section increased, the electrical resistivity (ER) decreased accordingly, with the degree of change being directly proportional to the magnitude of the applied stress.
9
Mousavi, Seyed Roohollah, Mohammad Ghasemi, and Mohammad Dehghani. "Investigating the fracture toughness of the self compacting concrete using ENDB samples by changing the aggregate size and percent of steel fiber." Engineering Solid Mechanics 12, no. 1 (2024): 17–26. http://dx.doi.org/10.5267/j.esm.2023.7.006.
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In reality, concrete structures are normally under various loadings, and results of different studies have shown that cracks in these structures and their materials, due to their nature as well as the loading type, do not develop along the crack plane (pure mode I); rather, they expand under mixed modes, making the crack growth studies under these modes a very important issue. In the crack growth phenomenon, the fracture toughness is a very effective parameter usually calculated by ENDB samples because they are easy to handle. In this study, several samples were made by changing the maximum aggregates size (dmax = 9.5, 12.5 & 19 mm) and the amount of hooked-end steel fibers (SF = 0.1, 0.3 & 0.5%), and tested under different loading modes (pure/mixed modes I and III) using the strain control jack device. According to the results, the lowest fracture toughness belonged to pure mode III, aggregates with dmax = 12.5 mm performed better in the self-compacting concrete reinforced with steel fiber, Also, the results show that the increasing trend of steel fibers does not have a positive effect on the fracture toughness performance.
10
Abbas, Mustafa Faisal, and Khamail Abdul-Mahdi Mosheer. "Mechanical properties of slurry-infiltrated fiber concrete (SIFCON) as sustainable material with variable fiber content." IOP Conference Series: Earth and Environmental Science 1232, no. 1 (2023): 012025. http://dx.doi.org/10.1088/1755-1315/1232/1/012025.
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Abstract For any member, sustainability is very important, which refers to the capacity to endure. Normal concrete has low tensile strength and could not exhibit significant tensile strain margins. Accordingly, it is essential to implement strategies that can enhance the behavior of conventional concrete before using it as structural concrete. Therefore, using Slurry-Infiltrated Fiber Concrete (SIFCON) composites is a current innovation in the field of civil engineering that has a considerable influence. This study presented an experimental study to improve the mechanical efficiency of a SIFCON mix with varying fiber content. To satisfy this objective, several SIFCON mixes, incorporating hook-end steel fiber with three different volume fractions (6, 7, and 8.5%) were prepared. The prepared mixtures performed compressive strength tests at 7 and 28 days, splitting tensile strength tests, and flexural strength tests both in the fresh and hardened states. The results pointed out that the fresh state mortar had proper filling and flow ability properties, satisfying the spread diameter requirement (between 240 and 260 mm) for SIFCON mortar, which is equal to 249 mm. For mechanical performance, the maximum compressive strength increased by 53% after 28 days for the mix’s SF of 8.5%. Furthermore, when compared to the reference mix, splitting, and flexural enhancement increased by 44% and 91%, respectively. On the other hand, the failure shape of SIFCON for all tested mixes has an impact on strengthening, that’s assigned to the high vast area of SF.
Book chapters on the topic "Hook-end steel fibers (SF)"
1
Niu, Ditao, Siyu Gong, Bingbing Guo, Zhiyuan Cao, and Yan Wang. "Study on Frost Resistance of Steel-PVA Hybrid Fiber Concrete." In Advances in Frontier Research on Engineering Structures. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8657-4_10.
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AbstractFreeze–thaw damage in cold areas is an important reason for the deterioration of durability of concrete structures, and the addition of fiber can effectively improve the frost resistance of concrete. To study the effect of steel fiber and polyvinyl alcohol (PVA) fiber on the frost resistance of concrete, an orthogonal experimental method was applied to analyze the frost resistance of steel-PVA hybrid fiber concrete. The effect of the steel fiber content, PVA fiber content, and steel fiber types were investigated on the mass-loss rate and relative dynamic elastic modulus of fiber concrete, to explore the mechanism of high frost resistance of it. The results show that steel fiber content has a significant effect on the mass-loss rate and relative dynamic elastic modulus of fiber concrete. The influence of PVA fiber content on the relative dynamic elastic modulus is relatively great, and the influence of steel fiber types of the mass-loss rate is the same. The frost resistance of concrete can be improved by adding hybrid fiber in concrete. When 1.0% End-hook steel fibers and 0.3% PVA fibers are added, the concrete specimen has the best frost resistance.