PVA纤维增强珊瑚混凝土静动态力学性能试验研究  

Experimental Study on Static and Dynamic Mechanical Properties of PVA Fiber-Reinforced Coral Concrete

作　　者：周进毅 龙志林[1] 郭瑞奇[1] 旷杜敏 蔡洋 陈莎莎 陈劲杰 ZHOU Jinyi;LONG Zhilin;GUO Ruiqi;KUANG Dumin;CAI Yang;CHEN Shasha;CHEN Jinjie(College of Civil Engineering and Mechanics,Xiangtan University,Xiangtan,Hunan 411105,China;College of Civil Engineering,Hunan University,Changsha,Hunan 410082,China;School of Traffic and Transportation Engineering,Changsha University of Science&Technology,Changsha,Hunan 410114,China)

机构地区：[1]湘潭大学土木工程与力学学院,湖南湘潭411105 [2]湖南大学土木工程学院,湖南长沙410082 [3]长沙理工大学交通运输工程学院,湖南长沙410114

出　　处：《中外公路》2024年第2期138-147,共10页Journal of China & Foreign Highway

基　　金：湖南省教育厅项目(编号:21C0065)。

摘　　要：为增强珊瑚混凝土的力学性能,对其进行了5种聚乙烯醇纤维体积分数(0、0.5%、1%、1.5%和2%)条件下的静态力学试验,并采用直径为100 mm的分离式霍普金森杆研究其在4种应变率下的冲击压缩性能。结果表明:掺入适量纤维能明显提高混凝土静态抗压强度与劈裂抗拉强度;动态力学试验表明珊瑚混凝土具有明显的应变率效应,加入纤维后能提高动态增强因子对应变率的敏感性,增强效果在纤维掺量为1.5%时趋于饱和;纤维在混凝土中起到了阻裂与耗能的作用,能明显地改善混凝土的破坏形态与冲击韧性。To enhance the mechanical properties of coral concrete,static mechanical tests were conducted at five polyvinyl alcohol fiber volume fractions(0,0.5%,1%,1.5%and 2%).The impact compression properties were investigated under four strain rates using a split Hopkinson pressure bar with a diameter of 100 mm.The results show that the incorporation of an appropriate number of fibers can significantly improve the static compressive strength and splitting tensile strength of concrete.Dynamic mechanical tests show that coral concrete has an obvious strain rate effect,and the incorporation of fibers can improve the sensitivity of the dynamic reinforcement factor to strain rate,with the reinforcement effect becoming saturated at 1.5%of fiber incorporation.The fibers serve to crack resistance and energy dissipation in concrete and can significantly improve the concrete damage morphology and impact toughness.

关 键 词：全珊瑚海水混凝土 聚乙烯混纤维 冲击压缩力学性能 应变率效应 

分 类 号：U414[交通运输工程—道路与铁道工程]