冻融循环下废弃纤维再生混凝土与钢筋的黏结性能  

Bond Behavior between Waste Fiber-Recycled Concrete and Reinforcement under Freeze-Thaw Cycles

作　　者：刘昱 周静海[1] 吴迪[1] 康天蓓[1] 于杭琳 LIU Yu;ZHOU Jinghai;WU Di;KANG Tianbei;YU Hanglin(School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China)

机构地区：[1]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《建筑材料学报》2023年第9期1031-1038,共8页Journal of Building Materials

基　　金：国家自然科学基金资助项目(52108235,51678374);辽宁省教育厅青年基金资助项目(lnqn202003);辽宁省高等学校创新团队项目(LT2019011);中央高校基本科研业务费专项资金资助项目(300102341511)。

摘　　要：首先通过冻融循环试验,研究冻融循环次数、再生骨料取代率、废弃纤维体积分数对再生混凝土与钢筋黏结性能的影响.其次从能量守恒与耗散的角度分析黏结性能损伤机理.最后基于损伤和强度劣化理论建立了黏结-滑移模型.结果表明:废弃纤维再生混凝土与钢筋的黏结性能随着冻融循环次数和再生骨料取代率的增大而降低;在再生混凝土中掺入废弃纤维可以显著提升黏结性能;当废弃纤维体积分数为0.12%时,黏结强度提升了11.35%;建立的黏结-滑移模型较好地表征了黏结强度与相对抗压强度之间的关系.Firstly,the effects of freeze-thaw cycles,replacement rate of recycled aggregates,and volume fraction of waste fibers on bond behavior between recycled concrete and reinforcement were studied under freeze-thaw cycle test.Secondly,the bond damage mechanism was analyzed from the perspective of energy conservation and dissipation.Finally,the bond-slip model was established based on the damage and strength degradation theory.The results show that the bond performance between waste fiber-recycled concrete and reinforcement becomes poor with increasing freeze-thaw cycles and replacement rate of recycled aggregates.The proper amount of recycled fiber is beneficial to the bond behavior between recycled concrete and reinforcement after freeze-thaw cycles,and the bond strength is improved by 11.35%when the volume fraction of recycled fibers is 0.12%.The proposed bond-slip model can better characterize the relationship between bond strength and relative compressive strength.

关 键 词：再生混凝土 废弃纤维 黏结性能 冻融循环 

分 类 号：TU528.01[建筑科学—建筑技术科学]