冻融损伤混凝土保护层锈胀开裂条件研究  

Research on rust expansion and cracking conditions of freeze-thaw damaged concrete protective layer

作　　者：王易安 雷永洁 刘西光[2] 孙一豪 范力[2] WANG Yian;LEI Yongjie;LIU Xiguang;SUN Yihao;FAN Li(Shaanxi Construction Engineering Group Co.Ltd.,Xi′an 710055,China;College of Civil Engineering,Xi′an Univ.of Arch.&Tech.,Xi′an 710055,China)

机构地区：[1]陕西建工集团股份有限公司,陕西西安710055 [2]西安建筑科技大学土木工程学院,陕西西安710055

出　　处：《西安建筑科技大学学报（自然科学版）》2023年第4期585-590,共6页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(52178163&51808437);陕西省重点研发项目(2022SF-403)。

摘　　要：对经历不同冻融循环次数钢筋混凝土棱柱体进行了通电加速锈蚀试验,研究了混凝土强度等级、冻融循环次数和保护层厚度对钢筋临界锈蚀率的影响,并通过DIC技术监测了钢筋锈蚀全过程.试验结果表明:混凝土抗压强度随冻融循环次数增加而降低.钢筋临界锈蚀率随保护厚度与钢筋直径之比(c/d)的增大整体呈上升趋势,但随冻融循环次数增加而减小.Accelerated corrosion tests were carried out on reinforced concrete prismatic specimens with different freeze-thaw cycles,and the influences of concrete strength grade,freeze-thaw cycles and protective layer thickness on critical corrosion rate of reinforcement were studied.The whole process of reinforcement corrosion was monitored by DIC technology.The test results showed that the compressive strength of concrete decreased with the increase of freeze-thaw cycles.The critical corrosion rate of reinforcement increased with the increase of the ratio of protection thickness to reinforcement diameter(c/d),but decreased with the increase of the number of freeze-thaw cycles.

关 键 词：冻融损伤 锈胀开裂 临界锈蚀率 DIC 

分 类 号：TU528.1[建筑科学—建筑技术科学]