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硫酸盐对混凝土侵蚀过程的细观数值分析

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硫酸盐侵蚀作为混凝土耐久性损伤的一个重要方面,日益受到人们的普遍关注.根据Fick第二定律和化学反应动力方程,建立了细观层面硫酸盐对混凝土侵蚀过程的数值分析方法.以混凝土随机凸多边形骨料模型为基础,利用Matlab程序对有限元软件进行二次开发,建立了基于扩散-化学反应的硫酸盐对混凝土侵蚀过程的细观数值分析方法,并与试验结果进行了对比.结果表明:硫酸盐侵蚀过程细观数值方法得到的模拟结果与试验结果吻合较好,可以有效模拟硫酸盐对混凝土的侵蚀过程;距混凝土表面一定深度范围内,SO42-浓度随表面SO42-浓度的提高而增加;砂浆中SO42-扩散系数是影响混凝土内SO42-最大侵蚀深度的主要因素;界面过渡区厚度对硫酸盐环境中混凝土损伤的影响较小.
Mesoscopic numerical analysis of sulfate attack on concrete
As an important aspect of concrete durability damage,sulfate corrosion,has been paid more and more attention.According to Fick's second law and chemical reaction dynamic equation,a numerical analysis method of sulfate corrosion on concrete at meso-scale is established.Based on the random convex polygon aggregate model of concrete,the finite element software is developed by Matlab program,and the meso numerical analysis method of sulfate corrosion process on concrete based on diffusion reaction is established,and the results are compared with the test results.The results show that the simulation results obtained by the meso numerical method of sulfate erosion process are in good agreement with the experimental results,and can effectively simulate the sulfate erosion process of concrete.The SO4-ion concentration of concrete increases with the increase of SO42-ion concentration in a certain depth range.The diffusion coefficient of SO42-ion in mortar is the main factor affecting the maximum erosion depth of SO42-ion.The thickness of interface transition zone has little effect on concrete damage in sulfate environment.

sulfate attackconcreterandom convex polygon aggregate modelnumerical analysis

金立兵、武甜、乔林冉、薛鹏飞、吴强

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河南工业大学混凝土结构长期性能研究所,河南郑州 450001

硫酸盐侵蚀 混凝土 随机凸多边形骨料模型 数值分析

国家自然科学基金河南省重点研发与推广专项

51509084212102110191

2024

混凝土
中国建筑东北设计研究院有限公司

混凝土

CSTPCD北大核心
影响因子:0.844
ISSN:1002-3550
年,卷(期):2024.(6)