Concrete with a low clinker content

A dry binder premix comprising, in mass proportions:

• Portland clinker having a Blaine specific surface area comprised from 4500 to 9500 cm2/g, a minimum quantity of said clinker by mass percentage relative to the total mass of the premix being determined according to the following formula (I):
• [−6.10−3×BSSk]+75 Formula (I)
• in which BSSk is the Blaine specific surface area of the clinker given in cm2/g;
• fly ash, the quantity of clinker+the quantity of fly ash being greater than or equal to 75%, by mass percentage relative to the total mass of the premix;
• 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 the group consisting of limestone powders, calcined shale, metakaolins, siliceous fillers, silica powders, pozzolans, slags, fly ash and mixtures thereof;
• the total quantity of clinker in the premix being less than 60% by mass percentage relative to the total mass of the premix.