Low cement concrete

C - Chemistry – Metallurgy – 04 – B

Patent

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Details

C04B 28/04 (2006.01) C04B 22/00 (2006.01)

Patent

CA 2652276

This invention relates to a mixture comprising the following proportion of masses: from 0.4 to 4 %, preferably 0.8 to 1.7 %, content of ultrafine grain size materials constituted by D90 particles measuring less than 1 µm and/or a BET specific surface area greater than 6 m2/g; from 1 to 6 %, preferably 2 to 5 %, of Portland cement; from 8 to 25 %, preferably 12 to 21 %, of fine grain size materials constituted by particles whose DlO and D90 are between 1 µm and 100 µm and have a BET specific surface less than 5 m2/g, both different from the cement; from 25 to 50 %, preferably 30 to 42 %, of medium grain size materials constituted by particles whose Dl 0 and D90 are between 100 µm and 5 mm and from 25 to 55 %, preferably 35 to 47 %, of superior grain size material constituted by particles whose Dl 0 which is greater than 5 mm. The invention also concerns, in particular, premixed concrete compositions and combined hardened concrete, as well as their preparation processes.

L'invention a pour objet un mélange comprenant en proportions massiques : de 0,4 à 4 %, de préférence de 0,8 à 1,7 %, de matériaux de classe granulométrique ultrafine, constituée de particules de D90 inférieur à 1 µm et / ou de surface spécifique BET supérieure à 6 m2/g; de 1 à 6 %, de préférence de 2 à 5 %, de ciment Portland; de 8 à 25 %, de préférence de 12 à 21 %, de matériaux de classe granulométrique fine, constituée de particules dont le DlO et le D90 sont compris entre 1 µm et 100 µm et de surface spécifique BET inférieure à 5 m2/g, différents du ciment; de 25 à 50 %, de préférence de 30 à 42 %, de matériaux de classe granulométrique moyenne, constituée de particules dont le Dl 0 et le D90 sont compris entre 100 µm et 5 mm; et de 25 à 55 %, de préférence de 35 à 47 %, de matériaux de classe granulométrique supérieure, constituée de particules dont le Dl 0 est supérieur à 5 mm. L'invention concerne aussi notamment des pré-mélanges, compositions de béton et objets en béton durci associés, ainsi que leurs procédés de préparation.

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