混杂纤维ECC的纤维分布规律及力学性能研究  

Study on the fiber distribution and mechanical properties of hybrid fiber ECC

作　　者：王振波 王鹏宇 朱凤强 韩硕 WANG Zhenbo;WANG Pengyu;ZHU Fengqiang;HAN Shuo(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《华中科技大学学报（自然科学版）》2023年第7期84-89,共6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(51808545);中央高校基本科研业务费专项资金资助项目(2023ZKPYLJ05).

摘　　要：在聚乙烯醇(PVA)纤维高延性水泥基材料(ECC)中混掺入钢纤维,试验研究了不同纤维掺量下混杂钢-PVA纤维ECC中两种纤维的分布情况及其对材料抗弯和抗压力学性能的影响.结果表明:随着钢纤维掺量增大,PVA纤维和钢纤维的分散系数均呈上升趋势,且两种纤维的倾角均倾向于小角度分布,钢-PVA纤维混杂在改善纤维分散及取向方面展现出协同效应;混杂纤维ECC在弯曲作用下的峰值荷载和延性均高于单掺纤维体系,钢纤维适量时,混杂纤维ECC的延性随纤维掺量增加不断提升;此外,钢-PVA纤维混杂也可提高ECC的抗压强度和韧性.Steel fibers were added into the polyvinyl alcohol(PVA)fiber reinforced engineered cementitious composites(ECC).The distribution of PVA fibers and steel fibers in hybrid fiber ECC with different fiber contents and their influence on the flexural and compressive properties of ECC were experimentally investigated.The results showed that with the increase of steel fiber content,the dispersion coefficient of PVA fiber and steel fiber increases simultaneously,and both of their fiber inclination tends to be distributed towards a small angle.The combination of steel fiber and PVA fiber is conducive to the distribution of fibers in the matrix.The peak load and ductility of hybrid fiber ECC under flexure are higher than that of mono fiber system.When a suitable dosage of steel fiber is incorporated,the ductility of hybrid fiber ECC can be continuously improved with increasing fiber content.Furthermore,the compressive strength and toughness of ECC can be also enhanced by blending PVA fibers and steel fibers.

关 键 词：混杂纤维延性水泥基材料 纤维分散 纤维取向 弯曲性能 抗压性能 

分 类 号：TU528[建筑科学—建筑技术科学]