School of Transportation Science and Engineering, Jilin Jianzhu University;
Steel fibers, known for their strong tensile properties and excellent bonding ability with concrete, lead to a rapid increase in concrete costs as the volume fraction of steel fibers in reactive powder concrete(RPC) increases. However, the rate of improvement in strength, toughness, and other properties gradually decreases. By fixing the volume fraction of steel fibers and altering the types and hybrid ratios of steel fibers, 22 sets of RPC specimens under standard curing conditions were designed and fabricated.Experimental analyses were conducted on mechanical indicators such as compressive strength, axial compressive strength, splitting tensile strength, flexural strength, and bending toughness. The research aimed to investigate the impact of various fiber lengths, fiber shapes, and hybrid ratios on the mechanical properties of RPC, and to identify an optimal hybrid scheme for steel fibers. The results show that with a 3%steel fiber volume fraction, the mechanical properties of RPC are optimal when the mixing ratio of 13 mm hooked-end steel fibers to 20mm hooked-end steel fibers is 1:3. Compared to RPC specimens using only 13 mm straight steel fibers, RPC with this mixing ratio exhibits a 24.78% increase in compressive strength, a 61.43%increase in splitting tensile strength, a 236.43% increase in flexural strength, and a 283.64% increase in bending toughness(I10). This confirms the feasibility of utilizing hybridized heterogeneous steel fibers to enhance the mechanical properties of RPC.
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Basic Information:
DOI：10.20203/j.cnki.2095-8919.2025.01.004
China Classification Code:TU528.572
Citation Information:
[1]田伟,杨洪涛.异种钢纤维混杂对活性粉末混凝土力学性能影响[J].吉林建筑大学学报,2025,42(01):26-34.DOI:10.20203/j.cnki.2095-8919.2025.01.004.
Fund Information:
吉林省科技厅重点研发项目（20220203048SF）