Effect of Cu-Zn coated steel fibers on high temperature resistance of reactive powder concrete

Scheinherrová, Lenka; Vejmelková, Eva; Keppert, Martin; Bezdička, Petr; Doleželová, Magdaléna; Krejsová, Jitka; Grzeszczyk, Stefania; Matuszek-Chmurowska, Aneta; Černý, Robert

doi:10.1016/j.cemconres.2018.12.008

Cited by 30 publications

(8 citation statements)

References 44 publications

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“…Moreover, a greater thermal expansion between the cement and steel fiber generated more cracks, which was considered to be the reason for the decrease in the compressive strength of concrete with the increase in steel fiber dosage [27,40]. In addition, Scheinherrová et al [49] discovered that the residual compressive behavior of concrete exposed to high temperatures was affected by the type of steel fiber coating. Under high temperatures, the compressive strength of reactive powder concrete with Cu-Zn-coated steel fibers was significantly higher than that reported in [43].…”

Section: Residual Compressive Strengthmentioning

confidence: 99%

Mechanical Properties and Explosive Spalling Behavior of Steel-Fiber-Reinforced Concrete Exposed to High Temperature—A Review

et al. 2020

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Steel-fiber-reinforced concrete (SFRC) is being increasingly applied to various buildings and civil infrastructure as an advanced cementitious composite. In recent years, the requirements for SFRC in the construction industry have increased. Additionally, the fire resistance of SFRC has attracted attention; therefore, numerous investigations regarding the residual properties of SFRC have been conducted. This paper critically reviews the mechanical properties of SFRC subjected to elevated temperatures, including its residual compressive strength, flexural strength, tensile strength, elastic properties, fracture properties, and stress–strain relationships. The residual mechanical performance of SFRC and the action mechanism of steel fibers are reviewed in detail. Moreover, factors affecting the explosive spalling of concrete at high temperatures as well as the effect of steel fibers on the microstructure of heated concrete are discussed. It is demonstrated that, in general, SFRC exhibits better residual mechanical properties when exposed to elevated temperatures than plain concrete and can prevent the risk of explosive spalling more effectively. The purpose of this literature review is to provide an exhaustive insight into the feasibility of SFRC as a refractory building material; additionally, future research needs are identified.

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Section: Residual Compressive Strengthmentioning

confidence: 99%

Mechanical Properties and Explosive Spalling Behavior of Steel-Fiber-Reinforced Concrete Exposed to High Temperature—A Review

et al. 2020

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“…The bridging and pulling effects of fiber could improve the brittleness and impact resistance of the mixture [16,17], and the three-dimensional randomly scattered fiber could effectively inhibit the generation and propagation of cracks [18]. Previous reports have found that polypropylene fiber [19], carbon fiber [20] and steel fiber [21] can be used as reinforcing materials for RPC, and the fiber commonly used to reinforce concrete is steel fiber [22]. To improve the flexural strength, compressive strength, elastic modulus and ductility of RPC, the recommended content of steel fiber is 2% volume fraction [23].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Freeze–Thaw Durability of Basalt Fiber Reactive Powder Concrete

Liu

Zhu

et al. 2020

Applied Sciences

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Basalt fiber has a great advantage on the mechanical properties and durability of reactive powder concrete (RPC) because of its superior mechanical properties and chemical corrosion resistance. In this paper, basalt fiber was adopted to modified RPC, and plain reactive powder concrete (PRPC), basalt fiber reactive powder concrete (BFRPC) and steel fiber reactive powder concrete (SFRPC) were prepared. The mechanical properties and freeze–thaw durability of BFRPC with different basalt fiber contents were tested and compared with PRPC and SFRPC to investigate the effects of basalt fiber contents and fiber type on the mechanical properties and freeze–thaw durability of RPC. Besides, the mass loss rate and compressive strength loss rate of RPC under two freeze–thaw conditions (fresh-water freeze–thaw and chloride-salt freeze–thaw) were tested to evaluate the effects of freeze–thaw conditions on the freeze–thaw durability of RPC. The experiment results showed that the mechanical properties and freeze–thaw resistance of RPC increased as the basalt fiber content increase. Compared with the fresh-water freeze–thaw cycle, the damage of the chloride-salt freeze–thaw cycle on RPC was great. Based on the freeze–thaw experiment results, it was found that SFRPC was sensitive to the corrosion of chloride salts and compared with the steel fiber, the improvement of basalt fiber on the freeze–thaw resistance of RPC was great.

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“…Whereas a larger quantity of steel fibers, in amount from 1.5 to 3.0%, assures achievement of the relatively high flexural and tensile strength of this concrete. Steel fibers play an important role in shaping of mechanical properties of this material [ 6 , 7 ]. Nowadays, the interest in modification of RPC properties grows through the application of various types of fibers, including basalt ones [ 8 ], and even of polypropylene [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

“…Taking the basalt fibers resistance to high temperatures into account, the objective of tests performed was to determine composition of the RPC with the highest compressive and flexural strength, which will be subject to high temperatures, as in case of tests of RPC with steel fibers, conducted by the authors of this paper [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Reactive Powder Concrete Containing Basalt Fibers: Strength, Abrasion and Porosity

et al. 2020

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The paper presents the test results of basalt fiber impact on a compressive and flexural strength, resistance to abrasion and porosity of Reactive Powder Concrete (RPC). The reasons for testing were interesting mechanical properties of basalt fibers, the significant tensile strength and flexural strength, and in particular the resistance to high temperatures, as well as a relatively small number of RPC tests performed with those fibers and different opinions regarding the impact of those fibers on concrete strength. The composition of the concrete mix was optimized to obtain the highest packing density of particles in the composite, based on the optimum particle size distribution curve acc. to Funk. Admixture of basalt fibers was used in quantity 2, 3, 6, 8 and 10 kg/m3, length 12 mm and diameter 18 µm. A low water-to-binder ratio, i.e., from 0.24, was obtained through application of a polycarboxylate-based superplasticizer. The introduction of up to 10 kg/m3 of basalt fibers to RPC mix was proved to be possible, while keeping the same w/c ratio equal to 0.24, with a slight loss of workability of the concrete mix as the content of fibers increased. It was found that the increase of the fiber content in RPC to 10 kg/m3, despite the w/c ratio was kept the same, caused reduction of the concrete compressive strength by 18.2%, 7.8% and 13.6%, after 2, 7, and 28 days respectively. Whereas, the flexural strength of RPC increased gradually (maximum by 15.9%), along with the fiber quantity increase up to 6 kg/m3, and then it reduced (maximum by 17.7%), as the fiber content in the concrete was further increased. The reduction of RPC compressive strength, along with the increase in basalt fibers content, leads to the increase of the total porosity, as well as the change in pore volume distribution. The reduction of RPC abrasion resistance was demonstrated along with the increase of basalt fibers content, which was explained by the compressive strength reduction of that concrete. A linear relation between the RPC abrasion resistance and the compressive strength involves a high determination coefficient equal to 0.97.

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Effect of Cu-Zn coated steel fibers on high temperature resistance of reactive powder concrete

Cited by 30 publications

References 44 publications

Mechanical Properties and Explosive Spalling Behavior of Steel-Fiber-Reinforced Concrete Exposed to High Temperature—A Review

Mechanical Properties and Explosive Spalling Behavior of Steel-Fiber-Reinforced Concrete Exposed to High Temperature—A Review

Mechanical Properties and Freeze–Thaw Durability of Basalt Fiber Reactive Powder Concrete

Reactive Powder Concrete Containing Basalt Fibers: Strength, Abrasion and Porosity

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