干湿循环下带裂缝高延性水泥基复合材料构件钢筋电化学腐蚀模型

郑剑峰

doi:10.3724/j.gyjzG23102404

干湿循环下带裂缝高延性水泥基复合材料构件钢筋电化学腐蚀模型

doi: 10.3724/j.gyjzG23102404

郑剑峰^1,2,3

1. 平潭综合实验区交通与建设局, 福建平潭 350400;
2. 福州大学土木工程学院, 福州 350108;
3. 平潭综合实验区创新研究院, 福建平潭 350400

基金项目:

福建省交通厅重点项目（202237）。

详细信息

作者简介:
郑剑峰，硕士，高级工程师，主要从事混凝土结构耐久性研究。电子信箱：xztwunty@163.com

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出版历程
- 收稿日期: 2023-10-24

Electrochemical Numerical Simulation of Engineered Cementitious Composite with Crack Under Chloride Ion Environment

ZHENG Jianfeng^1,2,3

1. Transportation and Construction bureau of Pingtan Comprehensive Experimental Zone, Pingtan 350400 China;
2. College of Civil Engineering, Fuzhou University, Fuzhou 350108, China;
3. Pingtan Comprehensive Experimental Zone Innovation Research Institute, Pingtan 350400, China

摘要

摘要: 为了研究带裂缝高延性水泥基复合材料（ECC）在干湿循环环境下的氯离子侵蚀情况，以裂缝宽度为变量，基于损伤基体下氯离子扩散系数的经验公式以及实测的氯离子扩散系数，建立COMSOL一维电化学数值模型，同时考虑裂缝区域和完好混凝土保护层所包裹下部区域的氯离子浓度的差异，引入阳极塔菲尔斜率修正，最后通过试验数据与模拟结果对比进行数据敏感性分析。结果表明：单一裂缝下受侵蚀的ECC模拟结果和试验数据拟合较好，主裂缝越大拟合结果越准确；越靠近主裂缝，氯离子的浓度越高，越接近氯离子边界浓度时钢筋的腐蚀速率越高；模拟误差随着损伤程度增加而减小，50%损伤条件下最大误差为15%，而90%损伤条件下误差最小仅为10%；ECC腐蚀速率与裂缝宽度在50 ~200 μm范围内符合logistics函数关系，相关系数为0.98。
- ECC /
- 氯离子 /
- 裂缝宽度 /
- 数值模拟 /
- 电化学
Abstract: In order to study the chloride ion erosion of Engineered Cementitious Composite（ECC） with cracks in the dry and wet cycling environment， a COMSOL one-dimensional electrochemical numerical model was established based on the empirical formula of chloride ion diffusion coefficient under the damaged matrix and the measured chloride ion diffusion coefficient with crack width as the variable， and the difference in chloride ion concentration between the crack area and the lower area wrapped by the intact concrete protective layer was also considered. The slope correction of anode Tafel is introduced， and the data sensitivity is analyzed by comparing the test data with the simulation results. The results show that the ECC simulation results of erosion under a single fracture fit well with the experimental data， and the larger the main fracture， the more accurate the fitting results. The closer the main crack is， the higher the chloride ion concentration is， and the closer the chloride ion boundary concentration is， the higher the corrosion rate is. The simulation error decreases with the increase of damage degree. The maximum error is 15% under 50% damage condition， while the minimum error is only 10% under 90% damage condition. ECC corrosion rate and crack width in the range of 50 μm to 200 μm crack width conform to the functional relationship of logistics function， and the correlation coefficient is 0.98.
- engineered cementitious composite（ECC） /
- chloride ion /
- crack width /
- numerical simulation /
- electrochemistry

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参考文献(19)

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