Influence of additives on performance and hydration process of cement

Abstract：Influences of two single additives, the mixed on cement physics performance and hydration characteristics were researched.Result indicated that single additive can increase fineness, fluidity of pastes and intensity of cement more or less, additive shows better in grinding water reduction, and strength enhancement which, the 80 μm sieve residue of cement is improved by 45.8%, the blain specific surface area is increased by 14.0%, content of 3-30 μm particles is increased obviously.An analysis of SEM in cement particles indicates that composite additive can decrease the content of coarse particle of cement, increase fluidity of pastes from 135mm to 190mm, and improve strength of 3 d and 28 d by 3.2 MPa, 7.4 MPa respectively.XRD analysis of hydrated cement indicates that composite additive can enhance hydration speed of cement and promote generation of more hydrated.

Keyword：additive;fineness;hydration;cement;