混凝土中温度对氯离子扩散系数的影响分析

Analysis on the Influence of Temperature on Chloride Ion Diffusion in the Concrete

在研究温度对氯离子在混凝土中扩散的影响时,许多学者采用了引入Arrhenius公式的N.S.Berke公式和Boddy公式.为了探究这两个公式在混凝土中应用的正确性,文章对公式的来源进行了梳理和推导,从混凝土的微观结构出发分析了引入Arrhenius公式考虑温度影响的合理性,并通过对相关腐蚀试验中活化能的计算,发现混凝土中活化能的取值与掺合料的种类和数量相关.考虑到混凝土是一种固体复合材料,因此,文中建议采用Boddy公式分析温度对扩散系数的影响并通过试验取得混凝土活化能的值.

N. S. Berke formula and Boddy formula are widely used to study the influence of temperature on the chloride ions diffusion in the concrete. In order to research the correctness of these two formulas, the pa- per gave a simple derivation and discussed the rationality of introducing Arrhenius formula into the research based on the concrete microstructure. Through the analysis of the related test, it shows that the activation energy＇s value is related to the type and amount of the mixed materials. Because the concrete is a kind of composite, the Boddy formula is recommended in analyzing the influence of temperature on the diffusion coefficient. The activation en- ergy of the concrete can be obtained through experiment.