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Title:
MODIFIED GYPSUM AND CEMENT ADMIXTURE USING IT
Document Type and Number:
Japanese Patent JP2002068795
Kind Code:
A
Abstract:

To provide a modified gypsum used for cement-based injection materials and injection materials for prereceive construction method, control of the reactivity of anhydrous gypsum and obtained from natural anhydrous gypsum, which cannot be used so far, capable of using for cement admixture as cement injection materials or cement quick hardening materials.

The modified gypsum is obtained by coating fatty acids, which are shown as (RCOO)nX (R is a saturated or unsaturated hydrocarbon; (n) is 1 or 2; and X is hydrogen, an alkali metal, or an alkali earth metal) and one or more kinds of lauric acid, myristic acid, palmitic acid, stearic acid, arachic acid, behenic acid, oleic acid, or their salts. The cement admixture is composed of the modified gypsum and calcium aluminate and used for cement compositions.


Inventors:
SASAGAWA YUKIO
KUSHIHASHI KAZUTO
ONO HIROSHI
Application Number:
JP2000254931A
Publication Date:
March 08, 2002
Filing Date:
August 25, 2000
Export Citation:
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Assignee:
DENKI KAGAKU KOGYO KK
International Classes:
C04B22/14; C01F11/46; C04B22/08; C04B28/02; (IPC1-7): C04B22/14; C01F11/46; C04B22/08; C04B28/02
Domestic Patent References:
JPS5339323A1978-04-11
JPH07144942A1995-06-06
JPH06115987A1994-04-26
JPS59121144A1984-07-13
JPH06127991A1994-05-10
JPH0769698A1995-03-14



 
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