Patent ID: 8246739

Claim:
A process for the preparation of a wet concrete composition, comprising a stage of mixing of: Portland clinker in the form of grains having a Dv97 from 10 to 30 μm or having a Blaine specific surface greater than or equal to 5300 cm 2 /g, the minimum quantity of the clinker in kg/m 3 being determined according to formula (V) for a clinker having a Dv97 from 10 to 30 μm, or according to formula (VI) for a clinker having a Blaine specific surface greater than or equal to 5300 cm 2 /g: [(90×ln(Dv97 k ))−150]×(W eff ÷140) Formula (V) in which Dv97 k is the DV97 of the clinker given in μm, W eff is the quantity of effective water in l/m 3 ; [(−0.021×BSS k )+263]×(W eff ÷140) Formula (VI) in which BSS k is the Blaine specific surface of the clinker given in cm 2 /g, W eff is the quantity of effective water in l/m 3 ; slag, of which the minimum quantity in kg/m 3 is determined according to formula (VII) in the case of a mixture with clinker having a Dv97 from 10 to 30 μm, or according to formula (VIII) in the case of a mixture with clinker having a Blaine specific surface greater than or equal to 5300 cm 2 /g: (3500÷BSS S )×[−90×ln(Dv97 k )+310]×(W eff ÷140) Formula (VII) in which Dv97 k is the Dv97 of the clinker given in μm, BSS S is the Blaine specific surface of the slag given in cm 2 /g, W eff is the quantity of effective water in l/m 3 ; (3500÷BSS S )×[0.021×BSS k −103]×(W eff ÷140) Formula (VIII) in which BSS k and BSS S are respectively the Blaine specific surface of the clinker and the slag given in cm 2 /g, W eff is the quantity of effective water in l/m 3 ; calcium sulphate; complementary materials, having a Dv90 less than or equal to 200 μm, of which the minimum quantity in kg/m 3 is determined according to the following formula (IX): 220−(quantity of slag)−(quantity of clinker)−(quantity of calcium sulphate) Formula (IX); from 1500 to 2200 kg/m 3 of aggregates; a plasticizer; optionally an accelerator and/or an air-entraining agent and/or a thickening agent and/or a retarder and/or a clay-inerting agent; with 140 to 220 l/m 3 of effective water, the total quantity of clinker in the wet concrete being less than or equal to 200 kg/m 3 .