Beton low clinker content

The present invention relates to a premix dry binder comprising, in weight proportions of: - Portland cement clinker having a Blaine specific surface area of ​​4500-9500 cm / g, preferably in the range of 5500-8000 cm / g, the minimum amount said clinker in mass percentage relative to the total weight of the premix is ​​determined by formula (I): wherein SSB is the Blaine specific surface of the clinker expressed in cm / g; - fly ash and / or pozzolan; - at least one alkali metal salt, the amount of alkali salt being such that the amount of Na O equivalent in the premix is ​​greater than or equal to 5% by mass percentage based on the weight of fly ash. - at least one source SO, in an amount such that the amount of SO in the premix is ​​greater than or equal to 2% in mass percentage relative to the mass Portland clinker; the amount of clinker + the amount of fly ash and / or pozzolans being greater than or equal to 75%, preferably 78%, in mass percentage relative to the total weight of the premix; the total amount of clinker in the premix being strictly less than 60% by mass percentage to the total mass of the premix. The invention also relates to a dry binder mixture obtained by mixing of the previous premix with aggregate, and a wet concrete composition obtained by mixing with water.