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:
Symposium Paper
Volume:
177
Issue:
Appears on pages(s):
93-104
Keywords:
alkali; calcium; gel; hydrate; mortars; slag; sulfate; temperature
DOI:
10.14359/6230
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