CONCRETE WITH A LOW CLINKER CONTENT

摘要

The present invention relates to a dry binder premix including, in weight proportions: Portland clinker with a Blaine specific surface area of between 4500 and 9500 cm2/g, preferably between 5500 and 8000 cm2/g, the minimum amount of said clinker in weight percent relative to the total weight of the premix being determined according to the following formula (I): [-6.10-3 x SSBk] + 75 where SSBk is the Blaine specific surface area of the clinker in cm2/g; fly ash; at least one alkaline sulphate, the amount of alkaline sulphate being such that the equivalent amount of Na2O in the premix is at least equal to 5 wt % relative to the weight of fly ash; at least one source of SO3, in an amount such that the amount of SO3 in the premix is at least equal to 2 wt % relative to the weight of the Portland clinker; additional materials having a Dv90 at most equal to 200 µm selected from among limestone powders, calcined schists, metakaolins, silica fillers, silica powders, pozzolanas, slag, fly ash and mixtures thereof; the amount of clinker plus the amount of fly ash being at least equal to 75 wt %, preferably 78 wt %, relative to the total weight of the premix; the total amount of clinker in the premix being strictly less than 60 wt % relative to the total weight of the premix. The invention also relates to a dry binder mix produced by mixing the preceding premix with aggregate, as well as to a wet concrete composition produced by mixing with water.