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研究了NaCl浸泡液浓度、浸泡时间、养护时间、浸泡温度和压滤压力对水泥基材料孔溶液中氯离子浓缩的影响。结果表明:在NaCl溶液中浸泡56 d后,水泥基材料试件孔溶液中自由氯离子浓度与浸泡液的氯离子浓度有很好的线性关系。当浸泡液浓度≤0.3 mol/L时,自由氯离子浓度比浸泡液的氯离子浓度至少高40%;当浸泡液浓度>0.3mol/L,自由氯离子浓度只稍微高出浸泡液的氯离子浓度。浸泡后的前63d,自由氯离子浓度随浸泡时间增加逐渐增加,随后,自由氯离子浓度开始随浸泡时间增加而降低。孔溶液中氯离子浓度随养护时间增加而减少。浸泡温度和压滤压力对自由氯离子浓缩没有太大的影响。双电层和试样孔结构压滤前后变化是水泥基材料孔溶液中的自由氯离子浓度升高的主要原因。
The effects of NaCl concentration, immersion time, curing time, immersion temperature and pressure on the chloride concentration in cement-based materials were studied. The results show that there is a good linear relationship between the concentration of free chlorine in the solution of cement-based material and the concentration of chloride ions in the solution after soaking in NaCl solution for 56 days. When the concentration of immersion liquid is less than 0.3 mol / L, the concentration of free chlorine ion is at least 40% higher than that of the soaking solution. When the concentration of the soaking solution is above 0.3 mol / L, the concentration of free chlorine ion is only slightly higher than the chloride ion concentration. In the first 63 days after immersion, the free chlorine ion concentration gradually increased with the soaking time, and then the free chlorine ion concentration began to decrease with the soaking time. Chloride concentration in the hole solution decreases with increasing curing time. Immersion temperature and pressure on the pressure of free chlorine ion concentration is not much effect. The change of electric double layer and sample pore structure before and after pressure filtration is the main reason for the increase of free chlorine ion concentration in pore solution of cement-based material.