硅酸盐学报2011，Vol.39Issue(3)：544-549,6.
氯盐浸泡的水泥基材料的表面氯离子浓度
Chloride Ion Concentration on the Surface of Cement-Based Materials in Chloride Solutions
摘要
Abstract
Chloride ion concentration on the surface of cement-based materials (cs) is an important parameter of the Fick's second law service life prediction model. The cs can be obtained by fitting chloride ion profile based on the Fick's second law. When cement-based materials are in contact with chloride solutions, the relation between the cs and the chloride ion concentration (c) of the exposure solution could not be well understood. Some previous work indicated that the cs is higher than the c. This is called condensation phenomenon by Nagataki. This paper investigated the relation between the cs and the c, and explored the corresponding mechanism. Three types of cement discs with the thick of 5 mm [ordinary Portland cement (OPC), 20％ (in mass, the same below) fly ash+80％ OPC, 40％ slag+60％ OPC] were immersed in sodium chloride solutions with the c of 0.15 mol/L, 0.5 mol/L and 1 mol/L,respectively. After 35 and 120d, the pore solutions of the cement discs were squeezed out by a pore expression method. The chloride ion concentrations were measured, and compared to the c of exposure solution. The results show that, the c obtained by the pore expression method is 30％ higher than that of exposure solution at 0.15 mol/L. At c＞0.5 mol/L, the c was equal to that of the exposure solution. The effect of electrical double layer could be responsible for this phenomenon.关键词
水泥基材料/表面氯离子浓度/双电层Key words
cement-based materials；surface chloride ion concentration/ electrical double layer分类
化学化工引用本文复制引用
元强,史才军,GEERT De Schutter,邓德华,何富强..氯盐浸泡的水泥基材料的表面氯离子浓度[J].硅酸盐学报,2011,39(3):544-549,6.基金项目
比利时根特大学研究基金资助. （）
