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AssigneeDenki Kagaku Kogyo Kabushiki Kaisha
InventorsMinoru Morioka, Yasuhiro Nakashima, Takayuki Higuchi, Mitsuo Takahashi, Kenji Yamamoto, Etuo Sakai, Masaki Daimon
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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 CO2 absorption 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 cm2/g.
A cement admixture, comprising a slowly cooled slag powder, wherein:
A cement admixture, comprising a slowly cooled slag powder, wherein:
A cement admixture, comprising:
A cement admixture, comprising a slowly cooled slag powder, wherein:
Dependencies are inferred from the claim text.