Nippon Steel Sumitomo Metal Corporation

Nippon Steel Esment Kanto Co., Ltd

Yukihiko Nagao

Tetsuharu Ibaraki

A ground granulated blast furnace slag for sulfate resistant cement comprising a mixture of ground granulated blast furnace slag with an alumina content of 12 to 17.5 mass % and high dissolution rate gypsum of 2 to 6 mass % of gypsum converted to mass of SO.

Sulfate resistant ground granulated blast furnace slag, sulfate resistant cement, and method of production of same

Mixed cement containing mainly ground granulated blast furnace slag with an alumina ratio of 12 to 17.5 mass % and Portland cement, wherein a ratio of mixture of the ground granulated blast furnace slag is made 10 to 60 mass % and wherein plaster having a specific surface area of 7000 cm/g or more is mixed in by a ratio of 2 to 4 mass % converted to SOmass. By using this mixed cement as a concrete material, it is possible to suppress expansion of the concrete even if in contact with soil containing residual sulfates over a long period.

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Tokyo, Japan

Yukihiko Nagao