Fast-setting pourable mortars with high fluidity

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 40/00 (2006.01)

Patent

CA 2555619

Described herein are new cementitious mortars with a high degree of fluidity and short consolidation times. The mortars contain water, a fast-setting cement, fluidifiers and/or superfluidifiers, setting regulators and aggregates having a specific granulometric distribution. The aggregates are made up of two fractions with different grain size such that the ratio between the characteristic grain diameters of the two fractions is comprised between 2.2 and 3.2. The new mortars thus obtained have values of fluidity 2-3 times higher than those of mortars produced with traditional aggregates; the increase in fluidity is obtained without increasing the water/cement ratio and without increasing the amount of fluidifiers present. The mortars produced according to the invention may be used to advantage in all applications in which it is required to associate a high degree of fluidity and a rapid consolidation.

L'invention concerne de nouveaux mortiers à base de ciment présentant une fluidité élevée et des temps de prise réduits. Ce mortiers contiennent de l'eau, un ciment à prise rapide, des fluidifiants et/ou des superfluidifiants, des régulateurs de prise et des granulats présentant une répartition granulométrique spécifique. Ces granulats sont formés de deux fractions présentant des tailles de grains différentes, le rapport entre les diamètres caractéristiques de grains des deux fractions étant compris entre 2,2 et 3,2. Les nouveaux mortiers résultants présentent une fluidité 2 à 3 fois plus élevée que celle des mortiers produits avec des granulats traditionnels, cette fluidité accrue étant obtenue sans augmentation du rapport eau/ciment, et sans augmentation de la quantité de fluidifiants. Ces mortiers sont avantageux dans toutes les applications nécessitant à la fois une fluidité élevée et une solidification rapide.

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