Abstract: An activating composition, in particular for concrete or industrial mortars containing hydraulic binder and/or pozzolanic material, comprises at least 40% by weight, preferably at least 50% by weight of calcium carbonate and/or magnesium carbonate particles having a d80 less than or equal to 15 µm, and a d50 less than or equal to 4 µm, and at least 1.5% by weight and up to 60% by weight of at least one alkaline metal salt. A binder composition is also provided, the binder composition comprising the activating composition and a component C comprising at least one hydraulic binder. The binder composition and at least one aggregate are combined to form a dry concrete or industrial mortar composition. Also provided is a process for preparing wet concrete or mortar compositions and hardened concrete or industrial mortar compositions obtained therefrom.

Abstract: A slag-based binder has at least one slag, optionally at least one CO3-containing mineral powder, optionally at least one co-binder different from the slag and mineral powder, at least one activator of the water/slag reaction, optionally at least one co-activator different from the one activator, at least one chelatant and/or at least one source of chelatant, said chelatant being preferably a scale inhibitor, and, optionally, at least one superplasticizer different from the chelatant. A kit is provided to make the binder. The binder is combined with an aggregate to make a dry concrete or mortar. A method for the preparation of a wet formulation (binder/water or concrete-mortar/water) is disclosed as is method of manufacturing buildings or civil engineering works or elements thereof, coatings, fillers, screeds, tiles, adhesives and/or internal or external insulation systems from the wet formulation. The binder is a substitute to OPC-based compositions and is environmentally friendly.

Abstract: A slag-based binder has at least one slag, optionally at least one CO3-containing mineral powder, optionally at least one co-binder different from the slag and mineral powder, at least one activator of the water/slag reaction, optionally at least one co-activator different from the one activator, at least one chelatant and/or at least one source of chelatant, said chelatant being preferably a scale inhibitor, and, optionally, at least one superplasticizer different from the chelatant. A kit is provided to make the binder. The binder is combined with an aggregate to make a dry concrete or mortar. A method for the preparation of a wet formulation (binder/water or concrete-mortar/water) is disclosed as is method of manufacturing buildings or civil engineering works or elements thereof, coatings, fillers, screeds, tiles, adhesives and/or internal or external insulation systems from the wet formulation. The binder is a substitute to OPC-based compositions and is environmentally friendly.

Abstract: This invention relates to a lightened gas-impermeable cement grout which comprises hydraulic cement, water, silica fumes in an amount of from about 5 to about 65 weight % based on the weight of the cement, and at least one polyethylene imine having a molecular weight of between about 600,000 and about 1,000,000 in an amount of from about 1 to about 25% weight % based on the weight of the water.