单端钩及多端钩型钢纤维混凝土拉压比的影响因素分析  

Influence factors of tension-compression ratio for single and multiple hooked-ends steel fiber reinforced concrete

作　　者：陈刚 史命 朱海堂 白晶[3] 肖旭 魏利敏 CHEN Gang;SHI Ming;ZHU Haitang;BAI Jing;XIAO Xu;WEI Limin(College of Civil Engineering,Henan University of Engineering,Zhengzhou 451191,China;China Gezhouba Group Co.,Ltd.,Wuhan 430000,China;School of Water Resources Science and Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]河南工程学院土木工程学院,河南郑州451191 [2]中国葛洲坝集团股份有限公司,湖北武汉430000 [3]郑州大学水利科学与工程学院,河南郑州450001

出　　处：《混凝土》2022年第1期21-24,共4页Concrete

基　　金：国家自然科学基金资助(51809085);河南省科技攻关项目(202102310254)。

摘　　要：通过混凝土立方体抗压强度和劈拉强度试验,系统研究了基体强度等级(C25~C80)、钢纤维掺量(20~110 kg/m^(3))、钢纤维外形(3D单端钩型与4D、5D多端钩型)、钢纤维长径比(65~100)以及钢纤维长度(35~60 mm)对混凝土拉压比的影响。结果表明,混凝土基体强度越大,脆性特征就越明显,但加入钢纤维可以提高混凝土的拉压比,改善脆性破坏特征;混凝土的拉压比随着钢纤维掺量、长径比的提高而增大,其中钢纤维掺量的提高最为显著;而钢纤维长度的变化对拉压比的影响较小;4D及5D多端钩型钢纤维可以更好地与基体锚固,在提高混凝土拉压比方面优于3D型单端钩型钢纤维。Compression and splitting tensile tests were conducted on the concrete cubic specimens.The effects of concrete strength grade(C25~C80),steel fiber content(20~110 kg/m^(3)),fiber shape(3D with single hooked-end,4D and 5D with multiple hooked-ends),fiber aspect ratio(65~100)and fiber length(35~60 mm)on the concrete tension-compression ratio were investigated.The results showed that the concrete brittleness is more prominent with the higher concrete strength.While the brittleness can be improved by introducing steel fibers into concrete,which is presented by the increased concrete tension-compression ratio.The concrete tension-compression ratio increases with the increasing fiber content and fiber aspect ratio,especially for the effect of fiber content.The varying fiber length has little effect on the concrete tension-compression ratio.Compared to 3D fibers with single hook-end,4D and 5D fibers with multiple hooked-ends have better anchorage with concrete and provide more contributions in the improvement of concrete tension-compression ratio.

关 键 词：钢纤维 混凝土 拉压比 

分 类 号：TU528.572[建筑科学—建筑技术科学]