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中文摘要：
为研究养护条件和水灰比对混凝土抗氯离子渗透性与微观孔结构的影响规律与程度,采用压汞法和RCM法对-3℃养护条件下和标准养护条件下的不同水灰比的混凝土28 d微观孔结构和氯离子渗透系数进行了测试,并用分形理论对其结果进行了分析。试验结果表明：-3℃负温养护条件下混凝土的临界孔径和最可几孔径明显大于标准养护条件下的同种混凝土,孔径粗化严重,粗大孔明显增多,其氯离子渗透系数也明显大于标准养护条件下的混凝土,与孔结构的发展规律一致。标准养护条件下,随着水灰比的提高,混凝土水泥石孔结构劣化,混凝土抗氯离子渗透性减弱;但在-3℃养护条件下,混凝土水泥石孔结构随着水灰比的提高呈现出先优化后劣化的趋势,混凝土抗氯离子渗透性变化规律亦与之相同。通过对比分析得出：孔分形维数与孔特征参数之间存在良好的线性关系,故与混凝土的氯离子渗透性之间亦有一定的联系。
英文摘要：
To study the influential law and degree of curing condition and water to binder ratio towards to the resistance to chloride ion permeability and microstructure ,pore structure and permeability of different water to binder ratio of the concrete cured 28 d at -3 ~C con- dition and standard curing condition were studied by mercury injection method and RCM method in the experiments ,and studied the resuits by fractal theory.The results show that the critical aperture and maximum probability aperture of concrete at -3 ℃ curing condition, is greater than the same kind of concrete, aperture is serious coarsened, under the curing condition coarse pore increases apparently, the chloride diffusion coefficient of concrete, which is at -3 ℃ curing condition,is greater manifest than the one at standard curing condition, it is same with the result of the test about microstructure.At standard curing condition, with the improvement of water to binder ratio, the weaker will the microstructure,the resistance to chloride ion permeability will weaker,but at -3 ℃ curing condition,the microstructure of concrete cement stone will optimizate first then deteriorate, the law of the resistance to chloride ion permeability is same as it.Through com- parative analysis, we found that good linear relationship exists between the fi＇actal dimension and characteristic parameters of pore structure, therefore, there is also a certain connection between the chloride ion permeability of concrete and the fractal dimension.
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