橡胶钢纤维再生骨料混凝土断裂性能试验研究  

Experimental study on the fracture behavior of steel fiber and crumb rubber reinforced recycled aggregate concrete

作　　者：谢志红[1] 黄培彦[2] 张剑洪[3] 谢建和[3] 郭永昌[3] 岑羽乔 

机构地区：[1]广州航海学院航务工程系,广州510725 [2]华南理工大学土木与交通学院,广州510640 [3]广东工业大学土木与交通工程学院,广州510006

出　　处：《深圳大学学报（理工版）》2014年第5期521-528,共8页Journal of Shenzhen University(Science and Engineering)

基　　金：国家自然科学基金资助项目(51278132);广东省科技攻关资助项目(2011B010400024)~~

摘　　要：以橡胶钢纤维再生骨料混凝土(crumb rubber and steel fiber reinforced recycled aggregate concrete,RSRAC)为研究对象,探讨橡胶掺量对其断裂性能的影响.设计了6组试件,包括5组不同配合比的RSRAC(橡胶体积分数分别为0、4%、8%、12%和16%)和1组不含橡胶的钢纤维原生骨料混凝土试件,每组含3个尺寸为100 mm×100 mm×515 mm带切口的小梁试件.基于三点弯曲断裂试验,得到了RSRAC的荷载-挠度曲线和荷载-裂缝张开位移曲线,通过计算RSRAC的断裂能和断裂韧度,分析了RSRAC断裂能和断裂韧度随橡胶掺量的变化规律.结果表明,RSRAC断裂能和断裂韧度随橡胶颗粒掺量的增加呈先增后减趋势,细骨料体积取代率为8%时,橡胶掺量可使RSRAC材料获得较好的断裂性能.This paper addresses the fracture behavior of crumb rubber and steel fiber reinforced recycled aggregate concrete （ RSRAC） . An experimental study was conducted on the effects of rubber content on the fracture behaviors of RSRAC. 6 specimens of 150 mm x 150 mm x515 mm were cast, including five RSRAC groups with different ratio of rubber content （rubber content being respectively 0, 4%, 8%, 12% and 16% by volume substitution of sand） and one group nature aggregate concrete （ NAC） without rubber. Each group contained three specimens. Based on a three-point bending test, the curves of load-deflection and load-crack mouth opening displacement were obtained,and both the fracture toughness and fracture energy were calculated. The results indicate that both the fracture tough-ness and fracture energy firstly increases and then decreases with the increase of the rubber content, and the rubber content is recommended to be 8% to provide the better fracture behavior for RSRAC.

关 键 词：固体力学 橡胶 再生骨料 断裂性能 钢纤维 混凝土 环保建筑材料 

分 类 号：O346.11[理学—固体力学]