摘要
为了研究混凝土中氯离子的分布情况,开展了普通混凝土氯盐侵蚀实验,得到了混凝土在氯盐侵蚀环境下的氯离子浓度分布及氯离子扩散系数的分布规律。基于蒙特卡洛理论,用Matlab软件对混凝土中氯离子扩散系数进行了10万次随机模拟,得出在一定深度(7.5~27.5mm)内NC30,NC40和NC50氯离子扩散系数服从对数正态分布,NC30,NC40和NC50所取得的氯离子扩散系数变异系数分别为0.20,0.22和0.20,可以代表氯离子扩散系数均值,其得出的NC30,NC40和NC50混凝土的氯离子扩散系数均值分别为5.468×10^-12,4.940×10^-12和4.132×10^-12m^2/s,表明混凝土强度等级越高的混凝土氯离子扩散系数越小。
In order to study the distribution of chloride ions in concrete. The chloride erosion test of ordinary concrete was carried out, from which can be obtained the concrete under chloride salt erosion in the distribution of chloride ion concentration and chloride ion diffusion coefficient. Based on Monte-Carlo theory, the diffusion coefficient of chloride ion in concrete is simulated by100,000 times using Matlab software. The chloride ion diffusion (COV) coefficient of NC30, NC40 and NC50 obeys the lognormal distribution within a certain depth (7.5~27.5 mm). The variation coefficient of chloride ion diffusion coefficient obtained from NC30, NC40 and NC50 is 0.20, 0.22 and 0.20, can be employed as the diffusion of chloride ion. The respective mean values of the chloride ion diffusion coefficient of NC30, NC40 and NC50 concrete are 5.468×10^-12, 4.940×10^-12 and 4.132×10^-12 m^2/s, indicating that the higher the concrete strength grade, the smaller the chloride ion diffusion coefficient of the concrete.
作者
程小康
肖林发
彭建新
胡守旺
CHENG Xiao-kang;XIAO Lin-fa;PENG Jian-xin;HU Shou-wang(School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,China;School of Environment and Civil Engineering,Dongguan University of Technology,Dongguan 523808,China)
出处
《交通科学与工程》
2019年第3期59-64,共6页
Journal of Transport Science and Engineering
基金
国家重点基础研究发展规划(973计划)项目(2015CB057701)
湖南省自然科学基金面上项目(2018JJ2438)
湖南省教育厅重点项目(18A136)
长沙理工大学校级研究生科研创新项目(CX2018SS04),长沙理工大学桥梁工程领域开放基金(18KD01)
关键词
氯离子
扩散系数
概率模型
蒙特卡洛法
chloride ion
diffusion coefficient
probability model
Monte-Carlo method
