锈蚀植筋下新老混凝土黏结面压剪试验研究  

Experimental research on load-shear performance of interface between new and old concrete with corroded planting bar

作　　者：彭怀德[1] 刘敦文[1] 戴兵[1] 曾水生 褚夫蛟 

机构地区：[1]中南大学资源与安全工程学院,长沙410083 [2]中交一公局第二工程有限公司,苏州215011 [3]山东理工大学资源与环境工程学院,淄博255049

出　　处：《工程科学学报》2018年第1期23-30,共8页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(51404303);湖南省教育厅科学研究资助项目(7C1086)

摘　　要：为研究锈蚀植筋下新老混凝土的黏结性能,采用某工程锈蚀钢筋作为植筋,制备了不同植筋率（0、0.223%、0.446%、0.502%、0.893%、1.004%、1.396%、1.786%和2.792%）的新老混凝土试件.在RYL-600微机控制岩石伺服剪切流变仪上进行了不同初始静压力（0、1、2、3和4 MPa）下混凝土试件的剪切试验.对试件的剪应力-位移曲线进行了归纳总结,得到了锈蚀植筋下新老混凝土试件在外力作用下产生变形乃至破坏的演化规律;分析了锈蚀植筋下新老混凝土黏结面的抗剪强度,得到了抗剪强度随植筋率及初始静压力变化的规律.同时根据试件试验破坏结果,着重分析了不同植筋率和不同初始静压力对其破坏模式的影响.试验结论为新老混凝土力学性能的研究提供了理论依据.Thus far,a lot of concrete structures have been aging owing to the rapid development of highways,railways,and the construction industry in China.Concrete structure diseases,such as concrete surface cracks and erosion,require serious consideration due to the effect of long-term use and environmental impact.Some man-made factors have exacerbated these problems,such as insufficient operating level and corners,among others.This has obscured safety risks associated with these concrete structures.However,not all of these structures could not be decommissioned to reduce the negative social and economic impact and to ensure the safety of buildings;therefore,a reasonable approach was to repair and reinforce the old concrete structures.Additionally,in the process of maintenance and reinforcement,planting bars between the new and old concrete must be considered,and especially the corroded planting bar from an aged project that has been terminated.Many studies for the bonding performance of new and old concrete have been conducted by the experts and scholars at home and abroad;thereby,some results have been achieved.Only a few scholars have investigated the bonding performance between new and old concrete with planting bars and especially corroded planting bars from old reconstruction projects that have been terminated.Therefore,investigating the shear performance of new and old concrete with corroded planting bars was of utmost importance.To study the mechanical properties of the interface between new and old concrete with corroded planting bars,the new and old concrete specimens with different planting bar ratios（0%,0.223%,0.446%,0.502%,0.893%,1.004%,1.396%,1.786%,and 2.792%） were prepared based on the corroded planting bars.These corroded planting bars came from the tunnel lining structure of a project that had been terminated for over five years.Shear tests were conducted for new and old concrete under different initial static pressures（0-4 MPa） in an RYL-600 microcomputer control servo rock shear rheometer.The e

关 键 词：新老混凝土 黏结面 锈蚀植筋 剪切试验 破坏模式 

分 类 号：TU528.1[建筑科学—建筑技术科学]