Compositions: coating or plastic – Coating or plastic compositions – Inorganic settable ingredient containing
Patent
1997-04-11
1998-09-22
Green, Anthony
Compositions: coating or plastic
Coating or plastic compositions
Inorganic settable ingredient containing
106789, 106790, 106791, 106624, C04B 728, C04B 714, C04B 1810
Patent
active
058109226
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a hardening composition which contains a slag composition and to a hardened product thereof, and more specifically to a hardening composition prepared through use of a composition produced by converting various wastes into the form of a fused slag. The hardening composition is capable of forming a hardened product having excellent strength when mixed with water and cured, and is used as material for mortar, concrete, and the like.
BACKGROUND ART
Conventionally, cement has been widely used as a hardening composition for use in mortar, concrete, and the like. Cement as represented by portland cement is obtained by burning in a kiln a material composition which contains limestone as a principal material, and which is a so-called hydraulic material which hardens through hydration.
Granulated blast furnace slag is known as a hardening material to be mixed with portland cement. Granulated blast furnace slag is obtained in a pig iron manufacturing process, is composed mainly of the three components SiO.sub.2, Al.sub.2 O.sub.3, and CaO, and normally has the following composition: CaO 38-45%, SiO.sub.2 33-35%, Al.sub.2 O.sub.3 14-18%, MgO 4-8%, and Fe.sub.2 O.sub.3 0.5-2%. Granulated blast furnace slag is produced by quenching molten slag that comes from a blast furnace. Because of quenching, granulated blast furnace is mostly vitrified without being crystallized; thus, granulated blast furnace slag is said to have latent hydraulicity. Through stabilization granulated blast furnace slag hardens in the form of CaO-SiO.sub.2 --H.sub.2 O--based gel, and CaO content is said to be an important factor for this hardening. Particularly, blast furnace cement composed of granulated blast furnace slag and portland cement is advantageously used for harbor works, sewerage works, and wastewater treatment works because of its high long-term strength and high chemical resistivity, but has a drawback that care must be taken in curing due to poor surface hardening. Accordingly, there has been strong demand for a good hardening composition which can replace granulated blast furnace slag.
Meanwhile, large cities in particular have various waste-related problems such as treatment of sludge and municipal refuse and securing of a final disposal yard for various industrial wastes, including construction waste. Thus, various investigations and research efforts regarding recycling of such wastes are actively under way.
Individual municipalities and apparatus manufacturers are developing technology for utilizing ashes which remain after sludge and municipal refuse are incinerated in order to reduce their volume, as well as technology for utilizing fused slag which is obtained when such ashes are melted in order to further reduce their volume. The thus-obtained slag has begun to be used as material for roadbeds, aggregate of blocks, tiles, bricks, etc., but usage is on a very small scale due to technical and price-related restrictions and a distribution problem. Such slag is not at a stage of intensive utilization, but still constitutes a headache for municipalities in that they must somehow dispose of it.
Regarding sludge, since 1975 the Ministry of Construction has been conducting investigations and research efforts for recycling of sludge. Also, the Ministry of Construction subsidizes facilities for utilizing sludge in order to promote utilization of sludge. Further, since 1988 the Ministry of Construction has been carrying out a model project for utilization of sludge resource wherein sludge products (roadbed material, soil conditioner, etc.) are positively used in sewerage construction works.
Despite such long-term studies on utilization of sludge and refuse, utilization of sludge-incinerated ashes and refuse-incinerated ashes as well as their fused slag have not yet been remarkably implemented.
DISCLOSURE OF THE INVENTION
In order to find new hydraulic material which can replace granulated blast furnace slag, the inventor has conducted various studies on composition and hardening p
REFERENCES:
patent: 4961787 (1990-10-01), Majumdar et al.
patent: 5073198 (1991-12-01), Kurz
patent: 5082501 (1992-01-01), Kurz
patent: 5593493 (1997-01-01), Krofchak
Patent Abstracts of Japan, abstract of Japanese Patent Specification No. 07-165447A, Jun. 1995.
Patent Abstracts of Japan, abstract of Japanese Patent Specification No. 06-345501A, Dec. 1994.
WPIDS Abstract No. 88-186596, abstract of Japanese Patent Specification No. 63-123842, May 1988.
Chemical Abstract No. 108:209182 which is an abstract of Japanese Patent Specification No. 63-045157 (Feb. 1988).
WPIDS Abstract No. 92-028789 which is an abstract of Japanese Patent Specification No. 06-099168 (Dec. 1994).
Ishida Yasuyuki
Okamoto Toyoshige
Uchida Jun
Chichibu Onoda Cement Corporation
Green Anthony
LandOfFree
Hardening composition and hardened product does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hardening composition and hardened product, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hardening composition and hardened product will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1619214