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
周进毅 1龙志林 1郭瑞奇 1旷杜敏 1蔡洋 2陈莎莎 3陈劲杰1
作者信息
- 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
- 折叠
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.
Abstract
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Key words
coral aggregate seawater concrete/PVA fiber/impact compression mechanical properties/strain rate effect引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据