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Study on Expansion Rate Assessment Method for Sulfate Resistance of Cementitious Material

By means of testing expansion rate of different cementitious material under the sulfate corrosion experimental conditions, sulfate resistance of cementitious material and assessment method are studied. The results show that expansion rate of cementitious material increased with corroded age, and the assessment method is put forwarded. Sulfate resistance of cementitious material can be divided into five classes according to expansion rate assessment method as follows: "very low", "low", "moderate", "high" and "very high". The sulfate resistance of Portland cement is better than ordinary Portland cement, and both of them are very low. Mineral admixture with proper content can improve sulfate resistance of cementitious materia largely. Sulfate corrosion mechanism of different kinds of cementitious material is analyzed.