研究了西部自然的大温湿差环境下硫酸钠溶液半浸泡混凝土的孔分形维数、孔结构及其渗透性能.基于压汞法的测试数据,计算了孔的分形特征参数,如孔体积分形维数、孔轴分形维数、孔轴曲率.通过对分形特征参数与渗透率的分析,得到孔体积分形维数、孔轴曲率与渗透率的线性相关性;孔轴分形维数与渗透率的无相关性;同时对小于0.1 μm孔的数量与渗透率的线性相关性进行了讨论.结果表明:不同养护条件和不同浓度硫酸钠溶液半浸泡的腐蚀条件主要影响小于0.1 μm的孔,该区间的孔越多,抗渗透性能越好;标准养护条件下的抗渗透性最好,室外大温湿差条件下的抗渗透性最差;硫酸钠半浸泡试样暴露于室外大温湿差环境下的区域抗渗透性能比浸泡于硫酸钠溶液中的区域差.%The fractal dimension of pore,pore structure and penetrability for concrete half-submerged in sodium sulfate solution under large temperature and humidity difference environment in the west of China were studied. Based on the experimental data from mercury intrusion method, fractal characteristic parameters of pores such as pore volume fractal dimension,pore axial fractal dimension and pore shaft curvature were calculated and the corre-lation between fractal characteristic parameters and penetrability were also established. Meanwhile the relationship between those pores with diameter smaller than 0.1 μm and penetrability were also discussed. The result shows that the curing condition and the concentration of sodium sulfate solution influence mainly those pores with diameter smaller than 0.1 μm,and the better resistance penetrability the more those pores. For different curing conditions, penetrability resistance under standard curing is the best,and that of large temperature and humidity difference out-door is the worst. For different corrosion conditions,the penetrability resistance of concrete exposed to natural envi-ronment is worse than that of concrete submerged in sodium sulfate solution.
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