珊瑚骨料混凝土动态压缩性能的试验研究

Experimental Study on Dynamic Compression Performance of Coral Aggregate Concrete

为探究珊瑚骨料混凝土在冲击荷载下的动态力学响应,采用分离式霍普金森压杆(SHPB)试验系统,建立了珊瑚骨料混凝土的动态应力-应变关系曲线,讨论了以珊瑚礁、砂为粗细骨料的混凝土动态强度增长因子、能耗密度、破损形态与应变率的关系,并与同强度等级的普通砂石混凝土进行对比分析.结果表明:珊瑚骨料混凝土的动态强度增长因子对应变率表现出更强的敏感性;2类混凝土的动态强度增长因子与应变率均呈对数函数关系,能耗密度与应变率呈线性关系;相同应变率条件下,珊瑚骨料混凝土由于骨料自身强度低、结构疏松且多内孔隙而使其能量吸收能力更强,表现出更好的抗冲击性能,但破碎程度稍大于普通砂石混凝土.

In order to explore the dynamic mechanical properties of coral aggregate concrete under impact loading,the split Hopkinson pressure bar(SHPB)test system was used to study the relationship between the dynamic strength increase factor and energy density and the strain rate of the concrete using coral reefs and sand as coarse and fine aggregates.Compared with ordinary sandstone concrete with the same strength grade,the results show that:the dynamic strength increase factor of coral aggregate concrete shows stronger sensitivity to the corresponding variability;the dynamic strength increase factor and the strain rate of the two types of concrete show logarithmic relation,the functional relationship shows a linear relationship between energy density and strain rate.Under the same strain rate conditions,coral aggregate concrete has higher energy for impact absorption,and the crushing degree is weaker than ordinary sandstone concrete,showing better impact resistance.