混杂钢纤维对钢纤维–超高性能混凝土界面黏结性能的影响  

Influence of Hybrid Steel Fibers on Interfacial Bond Performance Between Steel Fiber and Ultrahigh-performance Concrete

作　　者：朱平 池颜海 易笃韬 张哲 邵旭东 ZHU Ping;CHI Yanhai;YI Dutao;ZHANG Zhe;SHAO Xudong(Key Laboratory for Wind and Bridge Engineering of Hunan Province,College of Civil Engineering,Hunan University,Changsha 410082,China;State Key Laboratory of Advanced Design and Manufacture for Vehicle Body,Hunan University,Changsha 410082,China;College of Civil Engineering,Hunan University of Technology,Zhuzhou 412007,Hunan,China)

机构地区：[1]湖南大学土木工程学院风工程与桥梁工程湖南省重点实验室,长沙410082 [2]湖南大学汽车车身先进设计制造国家重点实验室,长沙410082 [3]湖南工业大学土木工程学院,湖南株洲412007

出　　处：《硅酸盐学报》2020年第10期1669-1681,共13页Journal of The Chinese Ceramic Society

基　　金：中国博士后科学基金(2016M602411);国家自然科学基金(51808212);山东省自然科学基金(ZR2019MA017)。

摘　　要：通过单根钢纤维拉拔试验,研究了2种钢纤维(平直型和端钩型钢纤维)在混杂钢纤维超高性能混凝土(UHPC)中的黏结性能。基于实测钢纤维拉拔荷载–位移曲线,分析了钢纤维混杂配比、钢纤维体积掺量对钢纤维–UHPC基体界面黏结性能的影响,以及钢纤维–UHPC基体界面黏结性能与UHPC抗压强度的关系,阐明了钢纤维在混杂钢纤维UHPC中的拔出过程,并建立了平直型和端钩型钢纤维拔出过程的黏结–滑移模型。指出UHPC基体内平直型和端钩型钢纤维体积掺量均为1%(体积分数)时,钢纤维混杂对钢纤维–UHPC基体界面黏结性能的增强效果最佳。The bonding performance of steel fibers(i.e., straight and hooked-end steel fibers) in hybrid steel fibers reinforced ultrahigh-performance concrete(UHPC) was investigated through single steel fiber pullout tests. Based on the load–displacement curves of steel fibers, the effects of hybrid steel fibers and their volume fraction on the bonding properties between hybrid steel fibers and UHPC were analyzed, and the correlation between the fiber–UHPC interfacial bonding properties and the compressive strength of UHPC was discussed. The pullout processes of steel fibers in hybrid steel fibers reinforced UHPC were clarified, and the pullout load–slip models of the straight and hooked-end steel fibers during the pullout processes were proposed. It is indicated that the hybrid of steel fibers could achieve an optimum interfacial bond performance between steel fibers and UHPC at the volume fraction of both straight and hooked-end steel fibers embedded in the UHPC matrix of 1%.

关 键 词：超高性能混凝土 混杂钢纤维 钢纤维拔出行为 界面黏结性能 黏结–滑移模型 

分 类 号：TQ175[化学工程—硅酸盐工业]