摘   要：试验测试了锂渣等量取代10%、20%、30%水泥的C30、C40和C60三个强度等级的混凝土在不同冻融循环次数下的强度和气体渗透系数，研究了冻融循环作用下锂渣混凝土强度和气体渗透性之间的相关性。结果表明：冻融循环作用下，锂渣混凝土的气体渗透系数和抗压强度与试件的初始状态、变化速率以及冻融循环次数密切相关，其性能劣化的曲线可采用生长模型中Slogistic1函数进行拟合求解；由拟合结果分析可知，对于C30和C40混凝土来说，锂渣掺量在20%以下，能够改善混凝土的气体渗透性和抗压强度，但对于C60混凝土来说，锂渣掺量超过10%后性能下降较明显；冻融循环作用下，锂渣混凝土气体渗透性系数与抗压强度线性相关性良好。

Abstract: The strength and gas permeability of C30, C40 and C60 lithium slag concrete under freezing-thawing cycles were tested to study the correlation between the strength and gas permeability coefficient of concrete under freezing-thawing cycles. The results indicate the strength and gas permeability coefficient of concrete under freezing-thawing cycles is affected by the initial state, the rate of change and the number of freeze-thaw cycles, the curve of its performance degradation can be got by Slogistic1 function in the growth model; the analysis of the fitting results shows that the amount of lithium slag is less than 20%, which can improve the gas permeability and compressive strength of C30 and C40 concrete;but for C60 concrete, the amount of lithium slag is more than 10%, and the performance decreases obviously. Under the freezing-thawing cycles, the gas permeability coefficient of lithium slag concrete has a good linear correlation with the compressive strength.