A blast furnace slag, i. e. ESUMENT from Shinnihon Steel Chemical Co., and reagents of gypsum and slaked lime, were used for test. Paste speciments with W/C=0.49-0.68 prepared from the three raw materials were tested.
The compressive strength of a mixed cement containing more than 50% of blast furnace slag, less than 50% of gypsum and 0.5% of slaked lime could be attained more than 300 kg/cm
2 by humid air curing at 28 days. Then, the hardened cement pastes were composed of the unreactive particles, narrow paper tablet-like ettringite and tobermorite gel.
In general, the formation of needle-like ettringite in the hardened paste tended to inhibit the development of compressive strength.
抄録全体を表示