PVA纤维天然浮石混凝土动态力学性能研究

Study of Dynamic Mechanical Properties of PVA Fiber Natural Pumice Concrete

以内蒙古地区的天然浮石为粗骨料配制天然浮石混凝土,采用Ф100分离式霍普金森压杆(SHPB)试验分析了不同聚乙烯醇(PVA)纤维体积掺量(0、0.15%、0.30%)天然浮石混凝土在冲击荷载下的动态力学性能。结果表明:随着PVA纤维掺量的增加,天然浮石混凝土的静态抗压强度增强,动态冲击压缩下破坏程度减弱;当应变率低于96 s^(-1)时,0.30%PVA纤维天然浮石混凝土的动态抗压强度最佳;当应变率高于127 s^(-1)时,0.30%PVA纤维天然浮石混凝土吸收的能量最多,相比于未掺纤维的天然浮石混凝土提高了11.0%。

Natural pumice concrete was prepared from natural pumice stone as coarse aggregate from Inner Mongolia,The dynamic mechanical properties of natural pumice concrete with different PVA fiber volume contents(0,0.15%,0.30%)under impact loads were analyzed by usingФ100 split hopkinson pressure bar(SHPB).The results show that with the increases of PVA fiber content,the static compressive strength increases,and the damage degree of the natural pumice concrete decreases.When the strain rate is lower than 96 s^(-1),0.30%PVA fiber natural pumice concrete has the best dynamic compressive strength.When the strain rate is higher than 127 s^(-1),0.30%PVA fiber natural pumice concrete absorbs the most energy,which is 11.0%higher than that of the natural pumice concrete without fiber.