Effect of Seasonal Characteristics of Temperature and Relative Humidity on Chloride Diffusion Process in Concrete: A Preliminary Theoretical Study
Effect of Seasonal Characteristics of Temperature and Relative Humidity on Chloride Diffusion Process in Concrete: A Preliminary Theoretical Study
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温度和相对湿度季节特征对混凝土中氯离子扩散过程影响的初步理论研究
DOI：
10.3390/su11226330
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发表时间：
2019-11
期刊：
影响因子：
3.9
通讯作者：
Xin Ruan
中科院分区：
文献类型：
--
作者：
Zichao Pan;Tianhua Li;Xin Ruan
氯离子扩散过程受温度和相对湿度的影响很大。分析模式中常采用年平均温度和相对湿度来计算氯离子剖面。然而，这些模型不能考虑温度和相对湿度的季节特性。本文从理论上对上述问题进行了研究。首次收集了我国几个主要城市的气温和相对湿度资料。然后，一维氯离子扩散的控制方程分别使用年和月平均温度和相对湿度的解析和数值方法求解。在这两种方法的基础上，引入了季节修正系数。得到了我国主要城市的城市发展系数值。基于结果，发现：（1）用年平均温度和相对湿度的解析解计算典型城市的氯离子剖面是有问题的，（2）季节校正系数与表观氯离子扩散系数无关，氯离子扩散过程中的活化能影响较小，临界相对湿度影响较大。普通波特兰水泥（OPC）砂浆和混凝土的水泥比。
The chloride diffusion process can be greatly affected by the temperature and relative humidity. Annual average temperature and relative humidity are often adopted in analytical models to calculate chloride profiles. These models, however, cannot consider the seasonal characteristics of temperature and relative humidity. This paper presents a theoretical study to solve the above problem. The temperature and relative humidity in several major cities in China are first collected. Then, the governing equation of one-dimensional chloride diffusion is solved by both analytical and numerical methods using the annual and monthly average temperature and relative humidity, respectively. Based on these two methods, a parameter called “seasonal correction coefficient” is introduced into the analytical models. The values of the coefficient for major cities in China are obtained. Based on the results, it is found that: (1) the analytical solution with annual average temperature and relative humidity is questionable to calculate chloride profiles for typical cities, (2) the seasonal correction coefficient is independent on the apparent chloride diffusivity, affected slightly by the activation energy of chloride ions during diffusion and greatly by the critical relative humidity for common water-to-cement ratios of ordinary Portland cement (OPC) mortar and concrete.
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