1 School of Materials Science and Engineering, Southeast University, Nanjing 211189; 2 Jiangsu Key Laboratory of Construction Materials, Nanjing 211189; 3 Collaborative Innovation Center for Sustainable Civil Engineering Materials & Structures, Nanjing 211189;
Abstract: There coexist large quantities of chlorides and sulfates in both salt lake and marine environment. The failure mode and mechanism of the cement-based materials under the chloride-sulfate circumstance differ considerably from those subjected to either of the two single substances. Hence it is of great necessity to explore the interactive effect between chloride and sulfate. Previous pertinent research can be classified into two aspects: the action of sulfate with the presence of chloride, and the action of chloride with the presence of sulfate. Sulfates have been found capable of significantly reducing the amount of chloride binding, as the sulfate ions can not only decompose the Friedel's salt, but also react with C3A or AFm to inhibit Friedel's salt formation. On the other hand, chloride ions can penetrate into cement-based materials prior to sulfate ions and react with cement hydration products, retarding the generation of ettringite and mitigating the external sulfate attack. As for the ion attack, the two salts interact with each other and restrict each other. Finally, from the perspectives of the current study, several issues which deserve consideration and further exploration are put forward.
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2018, Vol. 32 
