Effect of Carbonation on Chloride Maximum Phenomena of Concrete Subjected to Cyclic Wetting-Drying Conditions: A Numerical and Experimental Study.
Effect of Carbonation on Chloride Maximum Phenomena of Concrete Subjected to Cyclic Wetting-Drying Conditions: A Numerical and Experimental Study.
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碳化对循环润湿-干燥条件下混凝土氯化物最大现象的影响：数值和实验研究
DOI：
10.3390/ma15082874
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发表时间：
2022-04-14
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氯离子与碳化作用的共同作用通常会加速氯离子在混凝土中的渗透。大量研究表明，在干湿循环作用下，混凝土氯离子分布存在最大氯离子现象，影响混凝土结构使用寿命预测的准确性。碳酸化作用可能是引起氯离子最大值现象的关键因素之一。为了研究碳化对循环干湿条件下混凝土氯离子分布的影响，本研究建立了耦合碳化效应的数值模型，模拟了不同碳化程度下的氯离子分布，并将模拟结果与实验结果进行了验证。结果表明：考虑碳酸化效应后，各预测剖面均出现氯离子峰，且碳酸化程度越高，氯离子峰越显著；这说明在循环干湿作用下，碳化可以促进氯离子最大值现象的形成。在不同碳化条件下，计算结果与实验结果高度一致，特别是在氯离子峰浓度和对应深度方面。此外，氯离子最大值现象的显著程度与CO2浓度、环境湿度、温度等关键参数密切相关。
The combined action of chloride and carbonation generally accelerates chloride penetration in concrete. Plenty of studies have revealed a chloride maximum phenomenon in the chloride profiles of concrete under wetting and drying cycles, which affects the accuracy of the service life prediction of concrete structures. Carbonation is probably one of crucial factors inducing chloride maximum phenomena. To investigate the influence of carbonation on chloride distribution of concrete subjected to cyclic wetting–drying conditions, this study established a numerical model coupling carbonation effect, simulated chloride distribution at different carbonation degrees, and verified the simulation results with experimental results. The results show that a chloride peak appears in all predicted chloride profiles when carbonation effect is taken into account, and the higher the carbonation degree is, the more significant the chloride peak is. This demonstrates that carbonation can enhance the forming of chloride maximum phenomenon under cyclic wetting and drying. Moreover, the calculated results are highly consistent with the experimental results under different carbonation conditions, especially in terms of the peak chloride concentration and the corresponding depth. Furthermore, the significance degree of the chloride maximum phenomenon is closely related to some key parameters, such as CO2 concentration, environmental humidity, and temperature.
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