多次冲击压缩作用下大掺量粉煤灰超高性能钢纤维混凝土的动态力学行为  

Dynamic mechanical behavior of ultra-high performance steel fiber reinforced concrete mixed with high volume fly ash under multi-impact compression

作　　者：刘建忠[1,2] 孙伟[2] 刘加平[1,2] 石亮[1] 吕进[1] 李长风[1] 

机构地区：[1]江苏省建筑科学研究院有限公司高性能土木工程材料国家重点实验室,江苏南京210008 [2]东南大学江苏省土木工程材料重点实验室,江苏南京211189

出　　处：《河北工业大学学报》2014年第6期43-46,共4页Journal of Hebei University of Technology

基　　金：国家自然科学基金(50908104);江苏省自然科学基金(BK2011835)

摘　　要：采用分离式Hopkinson杆,系统研究了4种不同钢纤维体积掺量(分别为0%,1.0%,1.5%和2.0%)的大掺量粉煤灰超高性能混凝土在多次冲击压缩作用下的动态力学行为和材料损伤劣化的全过程.结果表明:在多次冲击压缩荷载作用下,随着钢纤维的掺入及掺量的增加,超高性能混凝土抗动态破坏作用的能力明显增强;随着冲击次数的增加,超高性能钢纤维混凝土的损伤不断累积直至最后失效,呈现出裂而不散的破坏特征.The influence of steel fiber volume dosage on dynamic mechanical behavior of ultra-high performance steel fiber reinforced concrete mixed with high volume fly ash under multi-impact compression was investigated. Four volume dosage levels of 0%, 1.0%, 1.5% and 2.0% were evaluated and the dynamic mechanical behavior was performed on split Hopkinson pressure bar apparatus. Results have revealed that ultra-high performance concrete has better resistance to multi-impact compression with the increase of steel fiber volume dosage. Furthermore, with the increases in the number of impact cycles, ultra-high performance concrete goes through damage from cracking to failure, with the fracture feature of cracking instead of breaking.

关 键 词：超高性能混凝土 大掺量粉煤灰混凝土 多次冲击压缩 动态力学行为 

分 类 号：TU528.572[建筑科学—建筑技术科学]