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Method for fabricating fiber-reinforced slag gypsum cement-based, lightweight set articles

  • US 5,366,549 A
  • Filed: 03/24/1994
  • Issued: 11/22/1994
  • Est. Priority Date: 11/28/1990
  • Status: Expired due to Fees
First Claim
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1. A method for making a fiber-reinforced slag gypsum cement lightweight hardened product which consists essentially of the steps of:

  • adding from 5 to 140 parts by weight of aggregates having a maximum size of not larger than 2000 μ

    m to 100 parts by weight of a mixture which comprises 100 parts by weight of Portland cement, from 20 to 350 parts by weight of slag fine powder which has a fineness ranging from 6,000 to 12,000 cm2 /g as Blaine'"'"'s specific surface area, from 0 to 20 parts by weight of lime, and from 20 to 100 parts by weight of calcium aluminate and gypsum fine powder in total, provided that a ratio by weight of the gypsum fine powder and the calcium aluminate is in the range of 0.5 to 2.0;

    1;

    adding from 0.01 to 1.5 parts by weight of a setting retardant to the mixture;

    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;

    wherein the amount of the prefoamed foams to be added to the slurry is the amount necessary to obtain a hardened product having an air-dried specific gravity of from 0.4 to 1.5.

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