Effects of Limestone Powder in Manufactured Fine Aggregate on Early Hydration Process and Types of Cement Hydrates

Abstract:

The crusher dust in Manufactured fine aggregate (MFA), e.g. limestone powder in calcareous MFA, constitutes micro gradation of the aggregate and suitable content of crusher dust in MFA can improve the properties of concretes. In this paper, early hydration processes of samples substituting limestone powder and fly ash for part of cement are analyzed, and effects of limestone powder on cement hydrates are studied through experiment of mortar prepared with MFA partially replaced by limestone powder and fly ash. The result reveals that both the dormant period and acceleration period of hydration ended earlier in the samples substituting limestone powder for part of cement, and amount of crystals of calcium hydroxide and hydrated calcium carboaluminate increases in hardened paste in the samples substituting limestone powder for part of MFA, i.e. calcareous dust (limestone powder) in MFA can stimulate and enhance hydration of cement.

• Periodical: Key Engineering Materials (Volumes 405-406)
• Pages: 262-266
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.405-406.262
• Online since: January 2009
• Authors: Ji Wei Cai, Shao Bo Zhang, Ming Kai Zhou, Bei Xing Li
• Keywords: Cement Hydrates, Crusher Dust, Early Hydration Process, Limestone Powder, Manufactured Fine Aggregate

References

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