The Interaction Between Chloride Ion and Sulfate Ion Doped in Cement Paste
ZANG Wenjie1, GUO Liping1,2,3, CAO Yuanzhang1, ZHANG Jian1, XUE Xiaoli1
1 School of Materials Science and Engineering, Southeast University, Nanjing 211189 2 Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189 3 Collaborative Innovation Center for Advanced Civil Engineering Materials, Southeast University, Nanjing 211189
Abstract: In order to investigate the interaction of chloride ion and sulfate ion in the cement paste at different curing time, cement paste using the salt solution mixed with chloride ion and sulfate ion, simulating the concentration of anions in the sea water in the South China Sea, as mixing water was micro-analyzed by the test methods such as XRD quantitative analysis, SEM and ion titration test methods. Under the condition of chloride ion doped, the results show that:the cement paste mixed with the salt solution of chloride ion as mixing water produced FS immediately. The existence of chloride ions can take the effect of restraining the generation of ettringite. In the condition of the experiment concentration, lea-ding the sulfate ion promoted the conversion from AFt to FS and increased the amount of chemically bound chloride ion. Chemical bonding that the participation of chloride ions formed by reaction of FS dominates an important role and sulfate ions played a supporting role at the early hydration. At the later stage of hydration, the adsorption of C-S-H gel to ions which was called physical adsorption, having inhibitory effects on the chemical binding of chloride ion.
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2019, Vol. 33 
