超高性能混杂钢纤维混凝土力学性能试验

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发布时间：2021-11-20

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采用工程上常用的 2种不同长径比、不同强度的端弯型钢纤维和超细型钢纤维，通过立方体
抗压试验和小梁抗弯试验，研究纤维体积率 (体积分数 )为 2．0 时，端弯纤维和超细纤维混合比例
对超高性能混凝土抗压强度、抗弯强度、延性的影响。结果表明：端弯纤维和超细纤维分别主导了
超高性能混凝土强度和延性性能；随着超细纤维体积率增加，超高性能混凝土抗压强度、抗弯强度
和弯曲韧性提高；随着端弯纤维体积率提高，小梁的延性增强；2种纤维混合，可以均衡地改善基体
混凝土的相应性能；综合考虑各力学性能指标和经济性，端弯纤维与超细纤维体积率分别为 0．5
和 1．5 时为最佳配比。
关键词：超高性能纤维混凝土；力学性能；纤维混杂；弯曲韧性；延性；抗弯强度
中图分类号：TU528．572 文献标志码：A
Experim ent on M echanical Properties of Ultra—high Perform ance
Reinforced Concrete with Hybrid—fiber
SUN Xiao—kai ，DIAO Bo ，YE Ying—hua ～，GENG Jiao ，M A Li—ya
(1．Department of Civil Engineering，Beihang University，Beijing 100191，China；
2． State Key Laboratory of Subtropical Building Science，South China
University of Technology，Guangzhou 510640，Guangdong，China)
Abstract：When doped volume ratio of fiber (volume fraction) was 2．0％，through cubic
com pressive tests and beam flexural tests，hybrid—fibers between end—hooked and superfine tape
steel fibers with different ratios of length to diam eter and different parameters were used to study
their effects on compressive strength，flexural strength， ductility of the ultra—high perform ance
concrete (U H PC)． The results show that the end—hooked and superfine fibers have their own
dom inative effects on m echanical properties of the bearing capacity and ductility behavior． W ith
the increase doped volume ratios of superfine fibers，the m echanical properties of compressive
strength，flexural strength and bend ductility of the U HPC increase． W ith the increase doped
volum e ratios of end—hooked fibers，the beam has a better performance on ductility． Hybrid—fibers
between end～hooked and superfine fibers can enhance performance in all aspects of mechanical
properties of concrete． Taking all factors of mechanical property index and econom ical efficiency
into consideration，it is the best mixture proportion when doped volume ratios of end-hooked and
superfine fibers are 0．5 ，1．5％．
Key words：ultra—high performance fiber reinforced concrete；mechanical property；hybrid—fiber