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: An exchanger having an enclosure with a bottom (5), a cover (4) and a peripheral casing (6), at least one block (1-3) disposed between the bottom and the cover, each block comprising a body, longitudinal channels (10) and transverse channels (12). At least one of the interfaces (112, 114, 123, 135) between two opposite front faces belonging to the cover and to the block adjacent thereto, to the bottom and to the block adjacent thereto, or optionally to two contiguous blocks, a so-called radially inner peripheral seal (J1, J?1) is provided, extending radially outside the area (14) of the openings of the longitudinal channels, and a so-called radially outer peripheral seal (J2, J?2) defining, with the inner peripheral seal and the opposite front faces, an annular space (E, E?) for containing a possible leak of one or the other fluid.

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 curing process of a concrete element including at least partially coating the element with a curing composition, the composition including a solvent and a thickening agent, the thickening agent being insoluble at a pH greater than 12 and being soluble in the solvent for a solubility range of pH, the upper limit of the solubility range being less than 11.

Abstract: A curing process of a concrete element including at least partially coating the element with a curing composition, the composition including a solvent and a thickening agent, the thickening agent being insoluble at a pH greater than 12 and being soluble in the solvent for a solubility range of pH, the upper limit of the solubility range being less than 11.