Mechanical performance and post-cracking behavior of self-compacting steel-fiber reinforced eco-efficient ultra-high performance concrete

Ferdosian, Iman; Camões, Aires

doi:10.1016/j.cemconcomp.2021.104050

Cited by 37 publications

(12 citation statements)

References 21 publications

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“…As shown in Figure 7, the highest splitting tensile strength that was obtained was 5.6 and 5.3 MPa for the RFA-0-CF-6 and RFA-35-CF-6 mix design, respectively. It is noticeable (Ferdosian and Camões, 2021) that with the addition of fibers the split tensile strength of the concrete improved significantly and prevents crack propagation. By adding more amount of waste carbon fibers to the concrete mix, the length and depth of the cracks will be reduced.…”

Section: Splitting Tensile Strengthmentioning

confidence: 99%

Experimental Study on Mechanical Performance of Recycled Fine Aggregate Concrete Reinforced With Discarded Carbon Fibers

Zaid

Hashmi

2021

Front. Mater.

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With the development of technology in every field, it is necessary to recommend an eco-friendly material to be utilized in the construction industry. Recently, using waste/recycled materials in the concrete as a substitute is a trend to bring sustainability to the construction industry, but the recycled/waste materials has poor mechanical properties, thus to enhance these poor properties, this research studies the mechanical performance of sustainable concrete incorporating waste materials as aggregates, the study is performed in the three stages. In the first stage, the natural sand was substituted with recycled sand in the percentage of 0, 35, 70, and 100%, and all the tests i.e. compressive strength, split tensile strength and flexural strength were performed on concrete which was cured in water for 28 days. As the 35% substitution of natural sand with recycled fine aggregate presented the optimum mechanical performance, it was selected for the third stage of the research. In the second and the third stages, the discarded carbon fibers were utilized in concrete with 2, 4, and 6% by weight. A total of 90 samples were prepared for this research, in which 30 samples were cubes, 30 samples were cylinders and 30 samples were beams, all the samples were tested at 28 days. Comparative analysis was performed to validate and verify the results of this paper with the relevant literature. The SEM test was also performed on a fractured concrete surface to study its microstructure. The outcome of tests revealed that the utilization of discarded carbon fibers in concrete enhances compressive, split tensile and flexural strength by 27.8, 17.8, and 35.9% and acts as a crack bridging and also restrain the propagation of the first cracks. Fibers also helped the concrete to improve its energy absorption capacity and ductility.

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Section: Splitting Tensile Strengthmentioning

confidence: 99%

Experimental Study on Mechanical Performance of Recycled Fine Aggregate Concrete Reinforced With Discarded Carbon Fibers

Zaid

Hashmi

2021

Front. Mater.

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“…Theoretical analysis is essential to further uncover the potential usage of reinforced UHPC specimens. Since the post-cracking strength was significantly improved in UHPC members [ 3 , 24 ], the contribution of concrete in the tension zone cannot be ignored when performing theoretical calculations in UHPC components [ 20 ]. However, the contribution of tensile stress was ignored in the current normal reinforced concrete (NRC) structural design code, and the tensile stress was considered triangularly distributed in the whole tensile zone at the cracking stage, which ignored the plastic development of UHPC.…”

Section: Flexural and Ductility Calculationmentioning

confidence: 99%

“…Owing to the constraints of coarse aggregate size and the addition of steel fiber, the reduced inner prosperity and local fracture zone are formed in the mixture [ 1 ]. Typically, UHPC offers a compressive strength of over 150 MPa and tensile strength of over 5 MPa, higher post-crack tensile strength [ 2 ] and improved post-cracking behavior [ 3 ] without brittleness grow due to the “strain-hardening” phenomenon in fiber-reinforced UHPC [ 4 ], and the superiority of UHPC structures over normal strength concrete (NSC) has already been documented in previous studies [ 5 , 6 ]. It should be noted that recent studies on UHPC include reactive powder concrete (RPC), ultra-high performance fiber reinforced concrete (UPFRC) and high ductility cement-based composites (HDCC) [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

Structural Response of High-Strength Wire-Reinforced UHPC Slabs Subjected to Bending

Luo

Wei

et al. 2022

Materials

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Using high strength wire (HSW) as a longitudinal reinforcement in UHPC can make full use of the outstanding properties of UHPC. In this paper, the flexural test was carried out on normal rebar-reinforced UHPC (NRRU) and HSW reinforced UHPC (HSWRU) slabs. The cracking resistance, failure modes, bearing capacity and deformation characteristics of specimens were investigated. The test results indicated that both HSWRU and NRRU specimens exhibited excellent flexural performance under concentrated loads. Fewer inclined cracks and a slower cracking development process were observed for HSWRU specimens, and brittle failure did not occur during the whole loading process. As compared to HSWRU specimens, the cracking and ultimate load of NRRU specimens increased by 24.64% and 85.47%, respectively, due to a higher reinforcement ratio. Then the theoretical method available for flexural capacity and ductility calculation was proposed, and the feasibility was substantiated through test results. In addition, the traditional deformation ductility coefficient was found to be 30% conservative against the applied energy ductility coefficient. Finally, the extensive parametric analysis revealed that the increase of the reinforcement ratio and the strength of the steel rebar significantly enhanced the ultimate capacity, while the ductility coefficient was obviously weakened. Inversely, those two factors had little impact on the cracking capacity. Moreover, section height was found to be beneficial for both the flexural capacity and ductility of specimens.

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“…Blast furnace slag and y ash are common industrial solid wastes with high production rates and widespread distributions [6][7][8][9][10]. Excessive emissions of these wastes contribute to severe air pollution and haze.…”

Section: Introductionmentioning

confidence: 99%

Influence of superabsorbent polymer (SAP) content, particle size and sodium silicate modulus on the performance of fly ash-slag paste filling materials

Ma,

Zhang,

Tang

et al. 2024

Preprint

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The use of solid waste cementitious materials in coal mining and mine filling applications has been limited by substantial volume shrinkage and inadequate hydration. This study explored the incorporation of a novel SAP to improve the workability of solid waste filling materials. We examined the impact of SAP content, particle size, and sodium silicate modulus on the workability and mechanical properties through fluidity, setting time, compressive strength, and drying shrinkage tests. The water absorption and release mechanism of the SAP, along with its effects on workability and mechanical properties, were investigated using nuclear magnetic resonance, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Our findings demonstrated that optimizing the SAP content, particle size, and sodium silicate modulus significantly enhanced the workability, stability, pumpability, and compressive strength of fly ash-slag paste filling materials. Our findings offer insights for modifying and developing solid waste filling materials and executing practical mine filling projects.

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Mechanical performance and post-cracking behavior of self-compacting steel-fiber reinforced eco-efficient ultra-high performance concrete

Cited by 37 publications

References 21 publications

Experimental Study on Mechanical Performance of Recycled Fine Aggregate Concrete Reinforced With Discarded Carbon Fibers

Experimental Study on Mechanical Performance of Recycled Fine Aggregate Concrete Reinforced With Discarded Carbon Fibers

Structural Response of High-Strength Wire-Reinforced UHPC Slabs Subjected to Bending

Influence of superabsorbent polymer (SAP) content, particle size and sodium silicate modulus on the performance of fly ash-slag paste filling materials

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