基于Weibull分布的镁水泥混凝土中钢筋锈蚀预测  

Corrosion Prediction of Steel Bar in Magnesium Cement Concrete Based on Weibull Distribution

作　　者：王鹏辉[1] 乔宏霞[1,2] 郭向柯 温少勇 李元可 WANG Penghui;QIAO Hongxia;GUO Xiangke;WEN Shaoyong;LI Yuanke(Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province,Lanzhou University of Technology,Lanzhou 730050,China;Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810083,China)

机构地区：[1]兰州理工大学甘肃省土木工程防灾减灾重点实验室,甘肃兰州730050 [2]中国科学院青海盐湖研究所,青海西宁810083

出　　处：《材料科学与工程学报》2020年第6期893-898,共6页Journal of Materials Science and Engineering

基　　金：国家自然科学基金资助项目(51468039,51868044);中国科学院盐湖资源与化学重点实验室开放基金资助项目(KLSLRC-KF-13-HX-8)。

摘　　要：氯氧镁混凝土中涂层对钢筋防护的退化是一个缓慢的过程,为解决镁水泥混凝土中涂层钢筋的寿命预测问题,对氯氧镁涂层钢筋混凝土进行溶液浸泡实验,采用电化学工作站对镁水泥涂层钢筋混凝土进行电化学试验,实测出表征涂层钢筋锈蚀的腐蚀电流密度。以相对腐蚀电流密度评价参数作为涂层的退化指标,采用最小二乘法对Weibull参数进行估计,在Weibull函数的基础上对涂层钢筋耐久性退化进行建模表明:相对锈蚀评价参数可以作为耐久性退化指标,Weibull分布函数可以很好的反映出镁水泥混凝土中涂层钢筋的耐久性退化过程。Coating protection degradation for steel bar in magnesium oxychloride concrete is a slow process.In order to solve the problems in life prediction of the coated steel bar in the magnesium cement concrete,solution immersion test,and then electrochemical experiment of the magnesium concrete coated steel concrete were performed by electrochemical workstation.Corrosion current density of the steel concrete was measured during the experimant.Evaluation parameter of the relative corrosion current density was used as the indicator of coating degradation.Weibull parameters are estimated by the least squares method,and the residual corrosion life of the steel is modeled on the basis of the Weibull function.The results show that relative corrosion evaluation parameter can be used as indicators of durability degradation and the Weibull distribution function can well reflect the durability degradation process of the coated steel bars in the magnesium cement concrete.The foundation is laid for establishing the corrosion life model of corroded steel bar in magnesium cement concrete.

关 键 词：电化学试验 腐蚀电流密度 Weibull函数 耐久性退化 

分 类 号：TU528.43[建筑科学—建筑技术科学]