Abstract
This paper studies four different cementitious materials including ordinary Portland cement paste and cement fly ash in closed environment based on previous study on characteristics of carbon sulphosilicate formation in single sulfate solution. As test paste, cement limestone paste and sulfate-resistant cement paste were put in a mixed solution of sodium sulfate and magnesium sulfate, the results of which show that solution pH value changes with time and the products change with pH values. Finally, the attack mechanism of carbon and sulfite in the embedded concrete is analyzed based on results of the concrete failure test.
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