The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 02, 2008
Filed:
Jun. 07, 2002
Minoru Morioka, Niigata, JP;
Yasuhiro Nakashima, Niigata, JP;
Takayuki Higuchi, Niigata, JP;
Mitsuo Takahashi, Niigata, JP;
Kenji Yamamoto, Niigata, JP;
Etuo Sakai, Chiba, JP;
Masaki Daimon, Tokyo, JP;
Minoru Morioka, Niigata, JP;
Yasuhiro Nakashima, Niigata, JP;
Takayuki Higuchi, Niigata, JP;
Mitsuo Takahashi, Niigata, JP;
Kenji Yamamoto, Niigata, JP;
Etuo Sakai, Chiba, JP;
Masaki Daimon, Tokyo, JP;
Denki Kagaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
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.