期刊论文

Effect of Shape and Content of Steel Fiber on Workability and Mechanical Properties of Ultra-High Performance Concrete

中文

材料导报

1005-023X

2021

35

04

4042-4052

10.11896/cldb.20030125

51778069:国家自然科学基金 52078059:国家自然科学基金 2015CB057700:国家重点基础研究发展计划（973计划） CX2016B386:湖南省研究生科研创新项目 16BCX01:实验室开放基金

本校为第一机构

选用四种平直及两种端钩钢纤维,研究钢纤维体积掺量、长径比、形状、同形及异形纤维混掺对超高性能混凝土（UHPC）施工及力学性能的影响。通过相关实验得到了UHPC扩展度、抗压强度、抗折强度、能量吸收、断裂能及弯曲应力-挠度曲线;基于弯曲应力-挠度曲线及改进后的规范方法计算了UHPC的弯曲韧性指标;最后,开展了最佳纤维混掺比例的研究。结果表明:纤维掺量每增加0.5%,UHPC扩展度平均降幅为2.72%,抗压强度平均增幅为5.79%。抗折强度、弯曲韧性指数和能量吸收则先增后减（临界掺量为3.5%）,断裂能呈上下波动（在3%时达最低值）。随着纤维长径比的增大,UHPC扩展度降低,抗压强度、抗折强度、弯曲韧...

The effects of steel fiber volume content,length-diameter ratio,shape,homogeneous fiber blending and deformed fiber blending on the workability and mechanical properties of ultra-high performance concrete ( UHPC) were investigated by using four kinds of straight steel fibers and two kinds of end hook steel fibers. The slump extension,compressive strength,flexural strength,energy absorption,fracture energy and flexural stress-deflection curves of UHPC were obtained. The flexural toughness index of UHPC were calculated according to the flexural s...