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:
Jun. 16, 1992
Filed:
Feb. 15, 1991
Masahiro Morozumi, Tondabayashi, JP;
Yasuhiko Yoshioka, Mitaka, JP;
Takashi Iwashimizu, Sakai, JP;
Masahiro Yamashita, Izumisano, JP;
Kenji Hayashi, Shijonawate, JP;
Yukihiro Tanigawa, Osaka, JP;
Hisao Kitano, Osaka, JP;
Fumio Tanimoto, Kyoto, JP;
Takenaka Corporation, Osaka, JP;
Hayashi Kasei Co., Ltd., Osaka, JP;
Abstract
An admixture for cement compositions is prepared by calcining at 630.degree. to 870.degree. C. at least one substance selected from the group consisting of natural kaolin, halloysite and synthetic kaolin, effecting classification so that amorphous portions of alumina/silica having a mixing ratio of 0.5 to 1.3 form main components, with all particles having diameters up to 8 .mu.m and an average diameter of 0.5 to 2 .mu.m, and a specific gravity ranging from 2.45 to 2.55. This admixture is used to produce a cement composition such as mortar or concrete, which realizes excellent fluidity to promote workability, and a high strength structure.