摘要
基于氯离子扩散系数与结构应力服从多项式函数关系的假定以及Fick第二定律,通过边界条件的奇延拓和扩散方程的傅里叶变换推导建立综合考虑结构截面线性分布应力的混凝土氯离子侵蚀模型,并给出其求解流程以及相关参数的确定方法,进一步结合既有混凝土氯离子侵蚀试验数据进行实例验证和对比分析。研究结果表明:所建立的氯离子侵蚀模型能够反映结构截面线性分布应力对氯离子扩散的影响,特别是在浅层区,计算的氯离子质量分数与既有成果较吻合,且更接近于试验值,模型是可靠的。
Based on the assumptions of polynomial relation between chloride diffusion coefficient and stress along with the Fick’s second law, and with the boundary conditions of odd extension and diffusion equation in the Fourier transform, a concrete chloride ion erosion model, which took the structure section linear distribution of force into consideration, was established, and the solving processes and the determination method of the related parameters were given. With the existing experimental data of concrete chloride ion erosion, a practical example was given to verify the results. The results show that the chloride ion erosion model can reflect the impacts of the linear section stress distribution of structure on chloride ion diffusion, and the calculated mass fraction of chloride ion coincides well with the existing results and is closer to the test results, especially in shallow area, which verifies that the model is reliable.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2018年第2期393-400,共8页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51508575)
湖南省创新平台与科技人才项目(2015RS4006)
中南大学中央高校基本科研业务费专项资金资助项目(2017zzts523
2017zzts154)
湖南省研究生科研创新项目(CX2016B050)~~
关键词
线性应力
FICK第二定律
氯离子扩散系数
傅里叶变换
linear distributed stress
Fick’s second law
chloride diffusion coefficient
Fourier transformation
