Abstract: A hydraulic binder includes, in parts by mass: (a) from 20 to 60 parts of Portland clinker; (b) from 20 to 40 parts of slag; and (c) from 0 to 60 parts of inorganic material other than the clinker and the slag; the sum of (a), (b) and (c) being equal to 100 parts; which binder further includes a slag activator including, relative to 100 parts of the sum of (a) and (b): from 1.4 to 6.55 parts of alkali metal salt, expressed as equivalent-Na2O; and from 1.1 to 11.0 parts of calcium sulfate, expressed as SO3.

Abstract: A hydraulic binder including in parts by mass: (a) 40 to 70 parts of a Portland clinker; (b) 30 to 60 parts of fly ash; (c) optionally up to 30 parts of an inorganic material other than clinker or than fly ash; (d) 2.5 to 15 parts of an alkali metal salt expressed in parts of equivalent-Na2O relative to 100 parts of fly ash; and (e) 2 to 14 parts of sulphate expressed in parts of SO3 relative to 100 parts of clinker; the fly ash having a Dv97 less than or equal to 40 ?m, and the sum of (a), (b) and (c) being equal to 100.

Abstract: A dry binder premix includes, in mass proportions: Portland clinker having a Blaine specific surface area comprised from 4500 to 9500 cm2/g, the minimum quantity of the clinker by mass percentage relative to the total mass of the premix being determined according to: [?6.10?3×BSSk]+75, in which BSSk is the Blaine specific surface area of the clinker given in cm2/g; fly ash; an alkali sulphate; one source of SO3; complementary materials having a Dv90 less than or equal to 200 ?m selected from limestone powders, calcined shale, metakaolins, siliceous fillers, silica powders, pozzolans, slags, fly ash and mixtures thereof. A quantity of clinker+the quantity of fly ash is greater than or equal to 75% by mass percentage relative to the total mass of the premix and a total quantity of clinker in the premix is less than 60% by mass percentage relative to the total mass of the premix.

Abstract: A hydraulic binder includes, in parts by mass: (a) from 20 to 60 parts of Portland clinker; (b) from 20 to 40 parts of slag; and (c) from 0 to 60 parts of inorganic material other than the clinker and the slag; the sum of (a), (b) and (c) being equal to 100 parts; which binder further includes a slag activator including, relative to 100 parts of the sum of (a) and (b): from 1.4 to 6.55 parts of alkali metal salt, expressed as equivalent—Na2O; and from 1.1 to 11.0 parts of calcium sulfate, expressed as SO3.

Abstract: A lightweight structural concrete includes a hydraulic binder; effective water; a superplasticizer; and aggregates; the concrete having a density in the fresh state varying from 1.40 to a Dmax value calculated according to formula (I) Dmax=1.58+(a×AM) in which “a” represents a coefficient for which the value is equal to 1; “AM” represents the mass percentage of the amorphous materials contained in 1 m3 of fresh concrete; the concrete having a maximum fresh state density Dmax less than or equal to 1.85; the concrete having a Weffective/L ratio varying from 0.19 to 0.

Abstract: A process for the preparation of a wet concrete composition, including mixing Portland clinker in the form of grains having a Dv97 from 10 to 30 ?m or having a Blaine specific surface greater than or equal to 5300 cm2/g; slag; calcium sulphate; complementary materials, having a Dv90 less than or equal to 200 ?m; from 1500 to 2200 kg/m3 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/m3 of effective water, the total quantity of clinker in the wet concrete being less than or equal to 200 kg/m3.

Abstract: A dry binder premix includes, in mass proportions: Portland clinker having a Blaine specific surface area comprised from 4500 to 9500 cm2/g, the minimum quantity of the clinker by mass percentage relative to the total mass of the premix being determined according to: [?6.10?3×BSSk]+75, in which BSSk is the Blaine specific surface area of the clinker given in cm2/g; fly ash; an alkali sulphate; one source of SO3; complementary materials having a Dv90 less than or equal to 200 ?m selected from limestone powders, calcined shale, metakaolins, siliceous fillers, silica powders, pozzolans, slags, fly ash and mixtures thereof A quantity of clinker+the quantity of fly ash is greater than or equal to 75% by mass percentage relative to the total mass of the premix and a total quantity of clinker in the premix is less than 60% by mass percentage relative to the total mass of the premix.

Abstract: A process for the preparation of a wet concrete composition, including a stage of mixing of: Portland clinker in the form of grains having a Dv97 from 10 to 30 ?m or having a Blaine specific surface greater than or equal to 5300 cm2/g, the minimum quantity of the clinker in kg/m3 being determined according to formula (V) for a clinker having a Dv97 from 10 to 30 ?m, or according to formula (VI) for a clinker having a Blaine specific surface greater than or equal to 5300 cm2/g: [(90×In(Dv97k))?150]×(Weff÷140)??Formula (V) in which Dv97k is the DV97 of the clinker given in ?m, Weff is the quantity of effective water in l/m3; [(?0.

Abstract: A lightweight structural concrete includes a hydraulic binder; effective water; a superplasticizer; and aggregates; the concrete having a density in the fresh state varying from 1.40 to a Dmax value calculated according to formula (I) Dmax=1.58+(a×AM) in which “a” represents a coefficient for which the value is equal to 1; “AM” represents the mass percentage of the amorphous materials contained in 1 m3 of fresh concrete; the concrete having a maximum fresh state density Dmax less than or equal to 1.85; the concrete having a Weffective/L ratio varying from 0.19 to 0.