摘要
以Fick第二定律为基础,综合考虑时变、氯离子结合作用、环境温度、混凝土劣化、相对湿度对氯离子扩散系数的影响,结合初始边界条件,建立了一维、二维、三维修正的氯离子扩散理论模型。通过模拟氯离子在混凝土中的多维扩散,对比分析了不同服役年限、水胶比、掺合料掺量等对氯离子扩散的影响,并通过工程实例和试验论证了模型的准确性。
Based on Fick’s second law and considering the influences of time-varying,chloride binding effect,ambient temperature,concrete deterioration and relative humidity on chloride ion diffusion coefficient,and combining with the initial boundary conditions,1D,2D and 3D modified chloride ion diffusion theoretical models were established.By simulating the multi-dimensional diffusion of chloride ion in concrete,the effects of different service life,water-binder ratio and admixture content on chloride ion diffusion were compared and analyzed,and the accuracy of the model was demonstrated through engineering examples and experiments.
作者
徐琳琳
周双喜
XU Lin-lin;ZHOU Shuang-xi(China Railway 18th Bureau Third Engineering Co.,Ltd.,Baoding 071000,China;School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China)
出处
《混凝土与水泥制品》
2022年第10期22-26,共5页
China Concrete and Cement Products
基金
国家自然科学基金重点资助项目(51662008)
国家自然科学基金重点资助项目(51968022)。
关键词
混凝土
氯离子
时变
扩散模型
掺合料
水胶比
Concrete
Chloride ion
Time-varying
Diffusion model
Admixture
Water-binder ratio
