Building products

C - Chemistry – Metallurgy – 04 – B

Patent

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25/111, 261/58

C04B 28/20 (2006.01) B28B 3/00 (2006.01) C04B 18/02 (2006.01) C04B 40/00 (2006.01)

Patent

CA 2287210

A method of forming a cementitious product comprising mixing a cementitious material with a siliceous material and a low bulk density material with water to form a slurry, forming a green shaped article from the slurry and curing the article in an autoclave. The low bulk density is substantially calcium silicate hydrate which is preferably obtained by reacting a calcareous reactant with a siliceous reactant in the presence of water and elevated temperature with at least 90 wt.% of the siliceous material having a particle size of less than 100 microns. Optionally the material can also include 0-25 % of fibrous material and 0-40 % of other additives. The resultant cementitious product is suitable for internal and external applications.

L'invention concerne un procédé de formation d'un produit à base de ciment consistant à mélanger un matériau à base de ciment avec un matériau siliceux et un matériau à faible masse volumique apparente avec de l'eau afin de former une laitance de ciment, à former un article profilé à cru à partir de la laitance de ciment et à autoclaver l'article. Le matériau à faible masse volumique apparente est un hydrate de silicate de calcium qui est obtenu, de préférence, par réaction d'un réactif calcaire avec un réactif siliceux en présence d'eau à une température élevée, 90 % au moins en poids du matériau siliceux présentant une granulométrie inférieure à 100 microns. Le matériau comprend éventuellement 0 à 25 % de matériau fibreux et 0 à 40 % d'autres additifs. Le matériaux à base de ciment obtenu convient à des applications internes et externes.

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