Each blended cement powder was placed on smooth, non
absorbent surface, a crater was formed in the centre and water
was poured into the crater. The dry mixture was slightly toweled over the remaining mixture to absorb the water for about
one minute. The mixing operation was then completed by continuous and vigorous mixing by means of an ordinary gauging
trowel for about three minutes. The paste was placed in one
cubic inch moulds and manually pressed strongly at the corner
along the surface of the mould. After compaction of the top
layer, the surface of the paste was smoothed by a thin edged
trowel. The hardened slag pastes were cured in 100% relative
humidity at 37 ± 2C up to 28 days