摘要
为了研究钢纤维和聚丙烯纤维对于配筋混凝土裂缝生发的影响,设计并开展了钢-聚丙烯混杂纤维配筋混凝土轴心拉伸试验.通过分析试件裂缝的形成过程、试件的初裂荷载以及平均裂缝宽度,得到不同应力水平下混杂纤维掺量对于基体混凝土抗裂性能的影响.试验结果表明:掺入混杂纤维可以明显改变有效配筋率在2%以下的混凝土的裂缝形态;混杂纤维能显著提高试件的初裂荷载并且减小试件的平均裂缝宽度;随着钢筋应力的增大,混杂纤维表现出了不同的阻裂效应;在同等纤维体积掺量下,配筋率越大则试件平均裂缝宽度越小.
To study the effect of steel fiber and polypropylene fiber on crack growth of reinforced concrete,the axial tensile test of steel-polypropylene hybrid fiber reinforced concrete was designed and carried out.The effect of hybrid fiber content on crack resistance of matrix concrete under different stress levels was obtained by analyzing the crack formation process,initial crack load and average crack width of the specimens.Experiment results show that the mixed fiber can significantly change the crack morphology of concrete with effective reinforcement ratio below 2%.Hybrid fiber can significantly increase the initial cracking load of the test piece and reduce the average crack width of the test piece.With the increase of reinforcement stress,hybrid fibers exhibit different crack resistance effects.Under the same volume fraction of fibers,the larger the reinforcement ratio,the smaller the average crack width of specimens.
作者
吴海林
裴子强
杨雪枫
WU Hailin;PEI Ziqiang;YANG Xuefeng(College of Hydraulic and Environmental Engineering,China Three Gorges University,Yichang 443002,Hubei China)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第4期43-47,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
国家自然科学基金资助项目(51879146).
关键词
钢筋混凝土
钢纤维
聚丙烯纤维
钢筋应力
轴拉试验
抗裂性能
reinforced concrete
steel fiber
polypropylene fiber
reinforcement stress
axial tensile test
crack resistance
