Takeda Chemical Industries, Inc.

Nippon Kokan Kabushiki Kaisha

Obayashi Corporation

Kyowa Giken Co., Ltd.

Naigai Technos Corporation

Dai-ichi Cement Co., Ltd.

Kiyoshi Koibuchi

Youichi Ishikawa

Tsuyoshi Aoyama

Kazuyoshi Sato

Seiji Kazama

Koji Nasu

Kazuo Fukaya

Eiichiro Konishi

Katsumi Takenami

Yasushi Iijima

Nagao Hori

Shokichi Imaizumi

Youich Ishikawa

A method is provided for making a fiber-reinforced slag gypsum cement lightweight hardened product. The method consists essentially of mixing (1) from 5 to 140 parts by weight of aggregates having a maximum size of not larger than 2000 .mu.m to (2) 100 parts by weight of a mixture which comprises 100 parts by weight of Portland cement, (3) from 20 to 350 parts by weight of slag fine powder which has a fineness ranging from 6,000 to 12,000 cm.sup.2 /g as Blaine's specific surface area, (4) from 0 to 20 parts by weight of lime, (5) from 20 to 100 parts by weight of calcium aluminate and gypsum fine powder, (6) 0.01 to 1.5 parts of a setting retardant; mixing water, prefoamed foams and reinforcing fibers with the mixture to obtain a slurry; subjecting the slurry to molding to obtain a molded product; removing the molded product to obtain a hardened product; and curing the hardened product with steam. In the method of the invention, the slurry sets and hardens within a short time, permitting the hardened product to be immediately removed from a mold.

Method for fabricating fiber-reinforced slag gypsum cement-based,

The invention provides a method of manufacturing a hydraulic hardening material having the steps of milling vitreous blast furnace slag and classifying the milled slag to provide slag powder having a blaine specific surface area of 6,000 to 12,000 cm.sup.2 /g. The hydraulic hardening material manufactured by the method is used as a Portland blast furance cement raw material.

Hydraulic hardening material and method of manufacturing the same

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Yokohama, Japan

Kiyoshi Koibuchi