Abstract: A hydraulic composition includes in relative parts by mass with respect to the cement 100 parts of cement the particles of which have a BET specific surface area comprised from 1.20 to 5 m2/g; 32 to 42 parts of water; 5 to 50 parts of a mineral addition A1 the particles of which have a D50 less than or equal to 6 ?m and selected from silica fume, metakaolin, slag, pozzolans or mixtures thereof; 90 to 230 parts of sand the particles of which have a D50 greater than or equal to 50 ?m and a D90 less than or equal to 3 mm; 0.0001 to 10 parts of a superplasticizer, the active material concentration of which is 15% by mass.

Abstract: A hydraulic composition includes in relative parts by mass with respect to the cement 100 parts of cement the particles of which have a BET specific surface area comprised from 1.20 to 5 m2/g; 32 to 42 parts of water; 5 to 50 parts of a mineral addition A1 the particles of which have a D50 less than or equal to 6 ?m and selected from silica fume, metakaolin, slag, pozzolans or mixtures thereof; 90 to 230 parts of sand the particles of which have a D50 greater than or equal to 50 ?m and a D90 less than or equal to 3 mm; 0.0001 to 10 parts of a superplasticizer, the active material concentration of which is 15% by mass.

Abstract: A hydraulic binder includes in mass percent from 20 to 82% of a Portland cement the particles of which have a D50 comprised from 2 ?m to 11 ?m; from 15 to 56% of a non-pozzolanic mineral addition A1, the particles of which have a D50 from 1 to 150 ?m and selected from among limestone additions, siliceous additions, siliceous limestone mineral additions, calcined shales, zeolites, burnt plant ashes, and mixtures thereof; from 4 to 30% of pozzolanic mineral addition A2, the particles of which have a D50 from 1 to 150 ?m; a sum of the percentages of the Portland cement, the non-pozzolanic mineral addition A1 and the pozzolanic mineral addition A2 being comprised from 90 to 100%.

Abstract: A concrete includes cement; effective water; aggregates (G1) having a maximum size of 20 mm and a real density (?1) of 450 to 1200 kg/m3; optionally aggregates (G2) having a maximum size of 4 mm and a real density (?2), such, that the real density (?) of the mixture (G1)+(G2) is comprised from 450 to 1200 kg/m3 with 1/?=m1/(?1)+m2/(?2) m1 and m2 respectively being the mass fractions of (G1) and (G2); the concrete having (a) a density in the fresh state of 800 to 1500 kg/m3, (b) a Weffective/Beq ratio varying from 0.19 to 0.60, (c) a quantity of effective water varying from 100 to 320 litres per cubic metre of fresh concrete, (d) quantity of cement and optionally of additions greater than or equal to 200 kilograms per cubic metre of fresh concrete; (e) a volume of paste greater than or equal to 300 l/m3 of fresh concrete and a volume of air of 1 to 16%.