摘   要：基于已有混凝土耐久性研究成果，通过建立砂浆在硫酸盐溶液作用下的两阶段三区域蚀强模型，推导出了双阶段的抗腐蚀系数公式，并采用双折线的强度损失率对系数的表达进行了简化，该系数可以充分考虑硫酸盐浓度、腐蚀时间、腐蚀扩散程度以及试件尺寸等因素对砂浆力学性能的影响。通过结合试验结果和参数的具体分析得出：该系数模型具有较强的适用性，可准确有效地评估硫酸盐作用下混凝土及砂浆腐蚀程度，且所采用的简化方法不仅能满足结果的精确性要求，同时对于公式的表达与最终参数的拟合更加简便与高效。

Abstract: Based on the existing research results of durability about concrete, the destruction process of the mortar under the action of sulfate solution was divided into two phases and three areas in this paper, and the corrosion resistance coefficients at the corresponding stage was put forward and simplified by using strength loss rate formula of the double broken line. The coefficient can fully consider the influences of not only sulfate concentration, corrosion time and the diffusion degree of corrosion, but also the effects of specimen size. Through a certain amount of fitting analysis of the test results, the coefficient model has strong applicability, and the simplified method adopted can not only satisfy the requirement of the accuracy of the results, but also make the formula expression and the final parameter fitting more convenient and efficient, so the coefficient can accurately and effectively evaluate corrosion degree of concrete and mortar under the action of sulfate.