The Strength of Cement Mortal Added with Seed Crystal at Various Temperatures of Curing

The present report gives data on compressive strength and bending strength of mortals added with seed crystal, at temperature of 3℃, 20℃ and 40℃ of curing. The seed crystal prepared from hydration of ordinary portland cement is respectively added to cements at the rate of 0.5%, 1% and 2%. The results obtained are summarized as follows. 1) Under addition of 0.5% to cement, strength of mortal increases as compared with plain mortal. At temperature of 20℃ of curing, compressive strength increases up to 126% to plain mortal. 2) It seem that addition of seed crystal is applied to steam curing and produces strengthened mortal or concrete.