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AssigneeRoquette Freres
InventorsLeon Mentink, Jean-Pierre Graux, Clement Robert
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A novel admixture for mineral binders is composed of a polyol composition with a high hydrogenated disaccharide content (≧40%). The hydrogenated disaccharide is advantageously chosen from maltitol, lactitol and mixtures thereof. Within the admixture, the polyol composition (for example, maltitol powder, a maltitol syrup or a hydrogenated starch hydrolysate) may be combined with conventional admixtures for mineral binders, particularly lignosulfonates. The hydrogenated disaccharides make it possible to obtain an excellent compromise between retardation, plasticity and the mechanical properties of the mineral binder. They may be used equally well for admixing with cements and raw materials for cements as for admixing with mortars, slurries and concretes.
A process for the preparation of a mineral binder, wherein an admixture comprising a polyol composition containing at least 40% by weight of hydrogenated disaccharide, said percentage being expressed with respect to the dry weight of all the polyols contained in said composition, is added in one or more operations to a mineral binder in powder form selected from the group consisting of cements, raw materials for the production of cements, hydraulic limes, dry or ready-mixed mortars and cement or mixtures thereof, said admixture being added in a ratio of 0.0001 to 5%, this percentage being expressed in dry admixture with respect to the total dry weight of said raw materials.
A process for the preparation of a mineral binder, wherein an admixture comprising a polyol composition containing at least 40% by weight of hydrogenated disaccharide, this percentage expressed with respect to the dry weight of all the polyols contained in said composition, is added in one or more operations
Dependencies are inferred from the claim text.