玄武岩纤维增强混凝土动态压缩力学性能研究  

Dynamic compression mechanical properties of basalt fiber reinforced concrete

作　　者：孙健 庞建勇[1] 郑瑞琪 苏永强 徐国平 SUN Jian;PANG Jian-yong;ZHENG Rui-qi;SU Yong-qiang;XU Guo-ping(School of Civil Engineering&Architecture,Anhui University of Science&Technology,Huainan 232001,China)

机构地区：[1]安徽理工大学土木建筑学院,安徽淮南232001

出　　处：《河南城建学院学报》2024年第2期13-19,共7页Journal of Henan University of Urban Construction

基　　金：矿山建设工程安徽省高校重点实验室开放基金(GXZDSYS2022106);安徽省高等学校自然科学研究重点项目(KJ2020A0297);安徽理工大学研究生创新基金项目(2022CX2038)。

摘　　要：采用直径为50 mm的分离式Hopkinson压杆试验装置,对不同气压下玄武岩纤维掺量为0%、0.05%、0.1%、0.15%、0.2%的玄武岩纤维增强混凝土(BFRC)进行动态压缩试验,研究BFRC在不同应变率下的力学性能,分析动态抗压强度与准静态抗压强度之间的关系以及冲击韧性,建立BFRC动态本构模型。结果表明:BFRC具有显著的应变率效应;动态抗压强度和比能量吸收值随玄武岩纤维掺量的增加呈先增加后减小的趋势,掺量为0.1%时达到最大值;动态强度增长因子与应变率对数近似呈线性增长关系;BFRC动态本构模型拟合试验与应力-应变曲线结果较吻合。A split Hopkinson pressure bar test device with a diameter of 50 mm was used to conduct dynamic compression tests on basalt fiber reinforced concrete(BFRC)with different basalt fiber contents of 0%,0.05%,0.1%,0.15%,and 0.2%under different gas pressures.The mechanical properties of BFRC under different strain rates were studied,the relationship between dynamic compressive strength and quasi-static compressive strength as well as impact toughness were analyzed to establish a dynamic constitutive model for BFRC.The results show that BFRC exhibits significant strain rate effect.The dynamic compressive strength and specific energy absorption increase first and then decrease with the increase of basalt fiber content,reaching the maximum value at a content of 0.1%.The growth factor of dynamic strength approximately increases linearly with the logarithm of strain rate.The dynamic constitutive model of BFRC fits well with the experimental and stress-strain curve results.

关 键 词：混凝土 玄武岩纤维 抗压强度 冲击韧性 动态本构模型 

分 类 号：TU528[建筑科学—建筑技术科学]