活性粉末混凝土冲击拉伸试验研究  

Experimental study on impact tensile behavior of reactive powder concrete

作　　者：孙伟[1] 焦楚杰[2] 

机构地区：[1]东南大学材料科学与工程学院,江苏南京211189 [2]广州大学土木工程学院,广东广州510006

出　　处：《广州大学学报（自然科学版）》2011年第1期42-47,共6页Journal of Guangzhou University:Natural Science Edition

基　　金：国家自然科学基金项目(50708022);广东省自然科学基金项目(06301038);建设部科研开发项目(2006-K1-37);住房和城乡建设部科研开发项目(2010-k3-27);广州市属高校"羊城学者"科研项目(10A043G)资助;广州大学科研创新团队项目资助

摘　　要：采用霍普金森压杆(SHPB)对活性粉末混凝土(RPC)进行冲击劈裂拉伸和冲击轴向拉伸试验.结果表明:RPC冲击轴拉强度是冲击劈拉强度的一半左右;钢纤维提高了RPC冲击拉伸强度1～1.5倍,并使RPC破坏形态由脆性转为韧性,避免了试件的多块劈裂与多段断裂;随着纤维体积率的增大,动静态劈裂强度比值减小;造成RPC试件破坏的主要内部因素是基体与钢纤维之间的粘结,而非钢纤维本身抗拉强度.Split experiments and spall experiments for the reactive powder concrete（RPC） are conducted using the split Hopkinson press bar（SHPB） apparatus.The results show that the spall strength of RPC is about half of the split tensile strength and that the addition of steel fiber into the RPC leads to an increase of the impact tensile strength of RPC by 1 to 1.5 times compared with that of the matrix.The failure pattern of RPC is pseudo plastic while that of the matrix is brittle and the matrix specimens are broken into multi-pieces.With the increase of the volume fractions of steel fibers,the ratio between the dynamic split strength and the static split strength decreases.Whether the RPC specimen fails or not depends on the bond strength between the matrix and the steel fiber,rather than the strength of the steel fiber.

关 键 词：霍普金森压杆 活性粉末混凝土 劈裂拉伸 轴向拉伸 

分 类 号：TU377[建筑科学—结构工程]