Lightweight concrete compositions

C - Chemistry – Metallurgy – 04 – B

Patent

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C04B 16/08 (2006.01)

Patent

CA 2644416

A lightweight ready-mix concrete composition that contains (8 -20) volume percent cement, (11 ~ 50) volume percent sand, (10 ~ 31) volume percent prepuff particles, (9 ~ 40) volume percent coarse aggregate, and (10 ~ 22) volume percent water, where the sum of components used does not exceed (100) volume percent;. The prepuff particles have an average particle diameter of from 0.2 mm to 8 mm, a bulk density of from 0.02 g/cc to 0.64 g/cc, an aspect ratio of from 1 to 3. The slump value of the composition measured according to ASTM C 143 is from 2 to 8 inches. After the lightweight ready-mix concrete composition is set for 28 days, it has a compressive strength of at least 1400 psi as tested according to ASTM C39.

La présente invention concerne une composition de béton léger prêt à l'emploi qui contient de 8 à 20 pour cent en volume de ciment, de 11 à 50 pour cent en volume de sable, de 10 à 31 pour cent en volume de particules qui vont gonfler, de 9 à 40 pour cent en volume d'agrégat brut, et de 10 à 22 pour cent en volume d'eau, la somme des composants utilisés n'excédant pas 100 pour cent en volume. Les particules qui vont gonfler ont un diamètre moyen de particules allant de 0,2 mm à 8 mm, une masse volumique apparente allant de 0,02 g/cm3 à 0,64 g/cm3, un rapport longueur/diamètre allant de 1 à 3. La valeur d'affaissement de la composition mesurée selon la norme ASTM C 143 va de 2 à 8 pouces. Après avoir séché pendant 28 jours, la composition de béton léger prêt à l'emploi a une résistance à la compression d'au moins 1400 psi telle que mesurée selon la norme ASTM C39.

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