再生混凝土三向受压试验及强度准则  

Mechanical Behavior and Strength Criterion of Recycled Aggregate Concrete(RAC)under Triaxial Compression

作　　者：陈宗平[1,2] 陈宇良[1] 应武挡 

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]广西大学工程防灾与结构安全教育部重点实验室,广西南宁530004 [3]同济大学建筑工程系,上海200092

出　　处：《建筑材料学报》2016年第1期149-155,共7页Journal of Building Materials

基　　金：国家自然科学基金资助项目(51268004);"八桂学者"建设工程专项经费资助项目;广西科技攻关项目(桂科攻12118023-3);广西自然科学基金资助项目(2013GXNSFDA019025);广西理工科学实验中心重点项目(LGZX201102)

摘　　要：为了研究再生混凝土的三向受压力学性能,以强度等级、围压值和再生骨料取代率为变化参数,设计24个试件进行常规三向受压试验.试验观察了试件的破坏形态,获取了其峰值应力、峰值应变、应力-应变全过程曲线等重要数据,并提出了三向受压状态下再生混凝土的强度、弹性模量和峰值应变计算式.结果表明:三向受压状态下,再生混凝土表现为剪切型破坏;随着围压值的增大,再生混凝土的弹性模量、峰值应力及峰值应变均显著增大,并且峰点后的应力-应变曲线下降段较平缓,再生混凝土的延性提高.最后利用莫尔-库仑理论探讨了再生混凝土的破坏准则.In order to study the mechanical behavior of recycled aggregate concrete（RAC）under triaxial compression,24 cylinder specimens were tested by considering the parameters of concrete strength,lateral confinement and recycled coarse aggregate（RCA）replacement ratio.The failure patterns of the specimens were observed in the tests.The stress-strain curves,peak stress and peak strain were obtained.The formulas for calculating the strength,elastic modulus and peak strain were put forward.The test results show that the failure pattern of RAC is the shear failure.The elastic modulus,the peak stress and the corresponding peak strain are enlarged with the increase of lateral confinement,and after the peak point in the stress-strain curve,the descending branch is gentle and the ductility is better.Finally,based on the MohrCoulomb failure criterion the strength criterion of recycled concrete is discussed.

关 键 词：再生混凝土 三轴受压 力学性能 应力-应变全曲线 强度准则 

分 类 号：TU318[建筑科学—结构工程]