Fiber cement building materials with low density additives

Details Fiber cement building materials with low density additives Fiber cement building materials with low density additives

C - Chemistry, Metallurgy

04

B

C04B 14/14 (2006.01) C04B 14/04 (2006.01) C04B 16/02 (2006.01) C04B 18/06 (2006.01) C04B 18/08 (2006.01) C04B 28/04 (2006.01) C04B 38/00 (2006.01) C04B 38/08 (2006.01) E04C 2/06 (2006.01)

Patent

CA 2402886

This invention relates to a formulation with the addition of low density additives of volcanic ash, hollow ceramic microspheres or a combination of microspheres and volcanic ash or other low density additives into cementitious cellulose fiber reinforced building materials. This formulation is advantageously lightweight or low density compared as compared to current fiber cement products without the increased moisture expansion and freeze-thaw degradation usually associated with the addition of lightweight inorganic materials to fiber cement mixes. The low density additives also give the material improved thermal dimensional stability.

L'invention concerne une formulation avec addition d'additifs à basse densité de cendres volcaniques, de microsphères creuses en céramique, ou d'une combinaison de microsphères et de cendres volcaniques ou d'autres additifs à basse densité dans des matériaux de construction renforcés de fibres de cellulose cimentantes. Cette formulation est avantageusement légère et de densité faible en comparaison des produits actuels en fibro-ciment, sans posséder les inconvénients d'expansion accrue à l'humidité et de dégradation due au gel-dégel habituellement associés à l'addition de matériaux inorganiques légers aux mélanges de fibro-ciment. Les additifs à basse densité confèrent aussi au matériau une stabilité dimensionnelle thermique améliorée.

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