Effect of Heat Curing on Expansion of Mortars and Composition of Calcium Silicate Hydrate Gel

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Title: Effect of Heat Curing on Expansion of Mortars and Composition of Calcium Silicate Hydrate Gel

Author(s): K. L. Scrivener and M. C. Lewis

Publication: Special Publication

Volume: 177

Issue:

Appears on pages(s): 93-104

Keywords: alkali; calcium; gel; hydrate; mortars; slag; sulfate; temperature

Date: 1/1/1999

Abstract:
A series of mortars was studied, cured at 20, 80 or 90°C. The variables studied included sulfate level, alkali additions and slag additions. In parallel with measurements of dimensional changes, detailed study of the microstructural and microchemical changes was made by XRD and by SEM. One of the main findings of this study is that the composition of C-S-H gel around partially hydrated cement grains, analysed one day after heat curing, is significantly different between mortars which subsequently expand when water at 20°C and those mortars which do not expand. The details conserved in of this observation, its implications and expansion are discussed. limitations, and possible mechanisms of