"Concrete With A Low Clinker Content"

Abstract: The present invention relates to a dry binder premix comprising, in mass proportions: - Portland clinker having a Blaine specific surface area comprised from 4500 to 9500 cm2/g, preferably from 5500 to 8000 cm2/g, the minimum quantity of the said clinker by mass percentage relative to the total mass of the premix being determined according to the following formula (I): in which BSSk is the Blaine specific surface area of the clinker given in cm2/g; - fly ash; - at least one alkali sulphate, the quantity of alkali sulphate being such that the quantity of equivalent Na2O in the premix is greater than or equal to 5 % by mass percentage relative to the mass of fly ash; - at least one source of SO3, in a quantity such that the quantity of SO3 in the premix is greater than or equal to 2 % by mass percentage relative to the mass of Portland clinker; - complementary materials having a Dv90 less than or equal to 200 µm selected from limestone powders, calcined shale, metakaolins, siliceous fillers, silica powders, pozzolans, slags, fly ash and mixtures thereof; the quantity of clinker + the quantity of fly ash being greater than or equal to 75 %, preferably 78 %, by mass percentage relative to the total mass of the premix; the total quantity of clinker in the premix being strictly less than 60 % by mass percentage relative to the total mass of the premix. The invention also relates to a dry binder mix obtained by mixing the previous premix with aggregates, as well as a wet concrete composition obtained by mixing with water.

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