细观尺度下橡胶混凝土钢筋非均匀锈胀反力研究  

Study on Non-Uniform Rust Expansion Reaction Force of Rubber Concrete Reinforcement at Mesoscopic Scale

作　　者：田清荣 金浩[1,2] Tian Qingrong;Jin Hao(Key Laboratory of Road and Traffic Engineering of the Ministry of Education,Tongji University,Shanghai 201804,China;Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety,Shanghai 201804,China)

机构地区：[1]同济大学道路与交通工程教育部重点实验室,上海201804 [2]上海市轨道交通结构耐久与系统安全重点实验室,上海201804

出　　处：《华东交通大学学报》2020年第5期31-37,共7页Journal of East China Jiaotong University

基　　金：国家自然科学基金项目(51908428);上海市自然科学基金项目(19IR1460400)。

摘　　要：钢筋锈蚀会导致橡胶集料混凝土开裂,降低橡胶集料混凝土结构耐久性。钢筋锈蚀膨胀引起的锈胀反力变化可大致反映橡胶集料混凝土的开裂过程。对橡胶集料混凝土内单根钢筋均匀锈蚀膨胀产生的反力进行细观数值模拟研究。结果表明:随着钢筋锈蚀程度的增加,钢筋锈胀反力先增加后减小,锈胀反力拐点出现时机对应混凝土开裂时机;钢筋锈蚀时总是钢筋上半区砂浆最先破坏,且混凝土保护层厚度越小,橡胶集料混凝土开裂越容易;保护层厚度不变,钢筋直径越大,橡胶集料混凝土开裂越容易;在本计算模型中,在拐点产生后,钢筋平均锈胀反力的大小关系对应橡胶集料含量为10%>5%>8%。研究结果对橡胶集料混凝土锈蚀反力研究具有指导意义。Corrosion of steel bars will lead to cracking of rubberized concrete and reduce the durability of rubberized concrete.The variation of rust expansion reaction caused by corrosion of steel bars can roughly reflect the cracking process of rubberized concrete.Therefore,in this paper,the reaction force caused by uniform corrosion and expansion of a single steel bar in rubberized concrete is studied through meso numerical simulation.The results show that:With the increase of corrosion degree of reinforcement,the steel rust expansion reaction first increases and then decreases,and the time of the inflection point of rust expansion reaction corresponds to the time of concrete cracking;With the increase of corrosion degree of reinforcement,the mortar in the upper half of the reinforcement is always damaged first;and the smaller the thickness of concrete protective layer,the easier the rubber aggregate concrete cracks;The thickness of the protective layer remains unchanged,and the larger the diameter of the reinforcement,the easier the rubberized concrete cracks;In the calculation model,the size relation of the average rust expansion reaction of reinforcement corresponds to the rubber aggregate content of 10%>5%>8%.The research results of this paper have guiding significance for the study of corrosion reaction of rubberized concrete.

关 键 词：橡胶集料混凝土 钢筋锈蚀 真实骨料 细观数值模拟 锈胀反力 

分 类 号：TU375[建筑科学—结构工程]