氯盐侵蚀作用下混凝土内钢筋锈胀效应的化学 力学转化  

Chemical-mechanical Transformation of Reinforcement Corrosion Expansion Effect on Concrete under Chloride Attack

作　　者：宋宇峰 徐亦冬[2,3] 弓扶元 毛江鸿 SONG Yufeng;XU Yidong;GONG Fuyuan;MAO Jianghong(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou 310017,China;Ningbo Tech University,Zhejiang University,Ningbo 315100,Zhejiang,China;Ningbo Research Institute,Zhejiang University,Ningbo 315100,Zhejiang,China)

机构地区：[1]浙江大学建筑工程学院,杭州310017 [2]浙大宁波理工学院,浙江宁波315100 [3]浙江大学宁波研究院,浙江宁波315100

出　　处：《硅酸盐学报》2020年第8期1249-1255,共7页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51778577);宁波市自然科学基金(2018A610229,2019A610401);长江科学院开放研究基金资助项目(CKWV2019752/KY)。

摘　　要：提出一个将氯盐侵蚀作用下混凝土内钢筋锈胀化学作用转化成力学作用的计算框架,从而将钢筋锈蚀的化学反应引入到宏观力学行为。首先,基于考虑不同湿度条件的钢筋锈蚀速率模型,得到钢筋电流密度icorr的计算方程;其次,在Faraday定律基础上确定钢筋总锈层厚度δ与钢筋电流密度icorr的关系;最后,基于均匀锈胀模型得到锈胀应力q和总锈层厚度δ的关系。数值验证表明:计算框架中的电流密度、总锈层厚度、锈胀应力与文献数值对应情况良好,化学-力学转化框架具有良好适用性。A calculation framework was proposed to transform the chemical action of reinforcement corrosion in concrete into mechanical action, leading the chemical reaction of reinforcement corrosion to the macroscopic mechanical behavior. A calculation equation of current density icorr was obtained by the corrosion rate model under different humidity conditions. A relationship between corrosion layer thickness δ and reinforcement corrosion rate icorr was thus determined based on the Faraday law. Also, a relationship between the corrosion expansion stress q and the corrosion layer thickness δ was obtained by the uniform corrosion expansion model. Based on the numerical results, the corrosion current density, corrosion layer thickness and corrosion expansion stress in the calculation frame could be in reasonable agreement with the reported values, thus indicating that the framework of chemical mechanical transformation is feasible.

关 键 词：混凝土 氯离子 化学-力学转化 锈蚀速率 膨胀应力 

分 类 号：TU375.5[建筑科学—结构工程]