工程水泥基复合材料与锈蚀钢筋黏结性能研究OA北大核心
Experimental study on bond performance between engineered cementitious composite and corroded rebars
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％.
李鑫平;车佳玲;刘海峰;王丹
宁夏大学 土木与水利工程学院,银川 750000宁夏大学 土木与水利工程学院,银川 750000||宁夏土木工程防震减灾工程技术研究中心,银川 750021宁夏大学 土木与水利工程学院,银川 750000||宁夏土木工程防震减灾工程技术研究中心,银川 750021宁夏大学 土木与水利工程学院,银川 750000
土木建筑
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
engineered cementitious compositecorroded rebarpull-out experimentbond strengthbond toughness index
《重庆大学学报》 2025 (1)
90-97,8
国家自然科学基金资助项目(52068060).Supported by National Natural Science Foundation of China(52068060).
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