abstract |
A cement admixture which is a substance obtainable bynblending a CaO material, a Fe 2 O 3 material, a CaSO 4 nmaterial and, if necessary, an Al 2 O 3 material, followednby heat treatment, and which comprises (1) free lime, (2)ncalcium ferrite and/or calcium aluminoferrite, and (3)nanhydrous gypsum. |