Fly Ash and Silica Fume Chemistry and Hydration


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Title: Fly Ash and Silica Fume Chemistry and Hydration

Author(s): Della M. Roy

Publication: Special Publication

Volume: 114


Appears on pages(s): 117-138

Keywords: durability; fly ash; hydration; portland cements; silica fume; strength; Materials Research

Date: 5/1/1989

Hydration of cements containing the supplementary cementing materials fly ash (FA) and silica fume (SF) is discussed and compared with the hydration of ordinary portland cement (OPC). Early stage heats of hydration, changes in the chemistry of the solution (both at early stages, and later pore solution compositions), microstructural development, and pore structure are compared. The hydration rates normally follow the order: SF > OPC > FA. The complex hydration processes may be controlled so that the use of these cements enables development of materials having superior strength and durability.