工程水泥基复合材料与锈蚀钢筋黏结性能研究  

Experimental study on bond performance between engineered cementitious composite and corroded rebars

作　　者：李鑫平 车佳玲[1,2] 刘海峰 王丹[1] LI Xinping;CHE Jialing;LIU Haifeng;WANG Dan(School of Civil Engineering and Water Conservancy,Ningxia University,Yinchuan 750000,P.R.China;Ningxia Civil Engineering Research Center for Earthquake Prevention and Disaster Mitigation Engineering Technology,Yinchuan 750021,P.R.China)

机构地区：[1]宁夏大学土木与水利工程学院,银川750000 [2]宁夏土木工程防震减灾工程技术研究中心,银川750021

出　　处：《重庆大学学报》2025年第1期90-97,共8页Journal of Chongqing University

基　　金：国家自然科学基金资助项目(52068060)。

摘　　要：为研究工程水泥基复合材料(ECC)与锈蚀螺纹钢筋的黏结破坏机理,采用中心拉拔试验方法,分析钢筋锈蚀率、黏结锚固长度、钢筋直径和纤维掺量等因素对黏结性能的影响。结果表明,ECC与锈蚀钢筋的黏结应力-滑移曲线可分为微滑移阶段、滑移阶段、破坏阶段和残余阶段,试件破坏类型为剪切拔出破坏;黏结强度随钢筋锈蚀率的增加先增大后减小,存在临界锈蚀率使得黏结性能最好;钢筋锈蚀率为10%时,试件黏结强度随钢筋锚固长度和钢筋直径的增大而减小;随着纤维体积掺量的增加,黏结韧性指数和黏结强度先增大后减小,纤维体积掺量为2%时,纤维的增韧和阻裂效果最明显。This study investigates the bond failure mechanism between engineered cementitious composite(ECC)and corroded rebars through pull-out experiments.The effects of corrosion rate,bond anchorage length,rebar diameter,and fiber content on bond performance are analyzed.The results show that the bond stress-slip curve can be divided into:micro-slip,slip,failure and residual phases.All specimens exhibit shear pull-out failure as the primary failure mode.The bond strength initially increases and then decreases with the corrosion rate and there is a critical corrosion rate resulting in the warimized bond strength.For rebars with a 10%corrosion rate,bond strength decreases as anchorage length and rebar diameter increase.Additionally,increasing the fiber content enhances the bond toughness index and bond strength initially,followed by a decline.The optimum performance,including maximum toughness and crack resistance,is observed at a fiber content of 2%.

关 键 词：工程水泥基复合材料 锈蚀钢筋 拉拔试验 黏结强度 黏结韧性指数 

分 类 号：TU502[建筑科学—建筑技术科学]