Abstract: In order to investigate the phase evolution and characteristics of cement-based materials in sulfate-chloride environments, some fly ash(FA)-blended cement mortar specimens were taken as the research object to perform the long-term immersion experiments in sulfate and chloride solutions with different concentrations. By using QXRD、SEM、MIP measurements, the evolution of product phases and the change of microstructures as well as the interactions between chlorides and sulfates in FA-blended mortar were analyzed. Results show that, at the early and middle stages of solution immersion, the competitions between sulfates and chlorides can reduce the contents of their corrosion products, and it can slow down the process of sulfate and chloride attacks. Moreover, at the late stage of solution immersion, the continuous formation of corrosion pro-ducts can deteriorate the pore structure of FA-blended mortar, causing the penetration of more sulfates or chlorides into the specimens, and this can accelerate the process of chloride and sulfate attack, so the presence of chlorides in the solutions can no longer delay the sulfate attack on the FA-blended mortar.
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2024, Vol. 38 
