Durable concrete compositions

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 38/08 (2006.01) B28B 23/04 (2006.01) B28C 5/08 (2006.01) C04B 14/02 (2006.01) C04B 18/08 (2006.01) C04B 28/00 (2006.01)

Patent

CA 2688668

Methods of controlling the durability of and/or the amount of air in concrete formulations that include combining cement, water, and optionally aggregates, admixtures and/or additives to form a cement mixture; and adding prepuff particles to the cement mixture to form a concrete formulation. The prepuff particles have an average particle diameter of from 0.2 mm to 3 mm, a bulk density of from 0.015 g/cc to 0.35 g/cc, an aspect ratio of from 1 to 3, and a smooth continuous outer surface. The cured and hardened concrete formulation typically has a relative dynamic modulus of at least 70% determined according to Procedure A of ASTM C666 (2003). The amount of air in the concrete typically increases over the amount of air in similar formulations not containing prepuff particles, as determined according to ASTM C231, based on the volume percent of prepuff. The concrete formulations can he used to make articles.

L'invention concerne des procédés de contrôle de la durabilité et/ou de la quantité d'air dans des formulations de béton qui comprennent la combinaison de ciment, d'eau et facultativement d'agrégats, de mélanges et/ou d'additifs pour former un mélange de ciment ; et, pour obtenir une formulation de béton, l'addition au mélange de ciment de particules qui gonflent jusqu'à un diamètre moyen de 0,2 mm à 3 mm, une masse volumique apparente de 0,015 g/cm<SUP>3</SUP> à 0,35 g/cm<SUP>3</SUP>, un rapport d'aspect de 1 à 3 et une surface externe continue lisse. Typiquement, la formulation de béton cuite et durcie présente un module dynamique relatif d'au moins 70 % déterminé selon la procédure A de ASTM C666 (2003). La quantité d'air dans le béton augmente typiquement par rapport à la quantité d'air dans des formations similaires ne contenant pas de particules qui gonflent, comme déterminé selon la norme ASTM C231, en fonction du pourcentage en volume de particules qui gonflent. Lesdites formulations de béton peuvent être utilisées pour fabriquer des articles en béton.

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