Abstract
The effects of different surface area of ground quartz in 24 hour precured and autoclaved cement-quartz pastes, at C S of 0.5, were investigated. Portlandite production and calcium silicate hydrate formation increased during procuring in the presence of ground quartz, while the compressive strength increased with increasing quartz surface area. Autoclaving for 8 hours at 177 °C under saturated steam yielded calcium silicate hydrates, belonging to the tobermorite group, of decreasing crystallinity with increasing surface area of quartz. The drying shrinkage increased with increasing surface area of quartz corresponding with the decrease in crystallinity of the binder, while the compressive strength reached an optimum value at a quartz surface area comparable to that of the cement used.
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