Patent ID: 8419851

Claim:
A sulfate resistant cement, comprising: a mixed cement comprising ground granulated blast furnace slag, Portland cement, and plaster selected from the group consisting of CaSO 4 , CaSO 4 -1/2H 2 O, CaSO 4 -2H 2 O, and the combination of CaSO 4 and CaSO 4 -2H 2 O, wherein 10 to 60 mass % of the ground granulated blast furnace slag has an alumina content of 12 to 17.5 mass %; wherein said plaster has a specific surface area of 7500 cm 2 /g or more; and wherein the content of SO 3 of the plaster is 2 to 4 mass % with respect to the total mass of the mixed cement.