Denki Kagaku Kogyo Kabushiki Kaisha

Etuo Sakai

Takayuki Higuchi

Masaki Daimon

Minoru Morioka

Yasuhiro Nakashima

Kenji Yamamoto

Mitsuo Takahashi

Minoru c/o Denki Kagaku Kogyo KK Morioka

Mitsuo c/o Denki Kagaku Kogyo KK Takahashi

Yasuhiro c/o Denki Kagaku Kogyo KK Nakashima

Kenji c/o Denki Kagaku Kogyo Kk Yamamoto

Takayuki c/o Denki Kagaku Kogyo KK Higuchi

A cement admixture of a low environmental load type, capable of reducing hexavalent chromium, having a small slump loss or heat of hydration, hardly neutralized and capable of suppressing autogenous shrinkage to a low level; a cement composition; and cement concrete employing it, are presented. The cement admixture comprises a slowly cooled slag powder which contains melilite as the main component and which has a carbon dioxide absorption of at least 2%, has a COabsorption of at least 2%, has a loss on ignition of at most 5%, contains at least 0.5% of sulfur present as non-sulfuric acid form sulfur and/or has a concentration of non-sulfuric acid form sulfur to elute, of at least 100 mg/l, and further, preferably, has a degree of vitrification of at most 30%, a melilite lattice constant a of from 7.73 to 7.82 and/or a Blaine specific surface area of at least 4,000 cm/g.

Cement admixture, cement composition, and cement concrete made therefrom

Growing community of inventors

Chiba, Japan

Etuo Sakai