Accelerating admixture for cementitious compositions

(22) 05.12.2014

(43) 18.06.2015

(57) The present invention describes a hardening accelerating admixture for hydraulic binders, the accelerator being based on transition metal silicate hydrates having the general formula: aMe_xO_y bMO cAl₂O₃ SiO₂dH₂O 1) where – Me represents a transition metal whose molar coefficient a is in a range between 0.001 and 2, preferably between 0.01 and 1; – M represents an alkaline earth metal whose molar coefficient b is in a range between 0 and 2, preferably between 0.3 and 1.6; – The molar coefficient cc for Al₂O₃ is in a range between 0 and 2, preferably between 0.1 and 1; – H₂O represents the hydration water of the silicate Hydrate whose molar coefficient d can vary within a wide range between 0.5 and 20; x and y can both be equal to 1 or different, depending on the valence of the transition metal, given that the valence of the oxygen atom in the metal oxide is equal to 2.

(71) Mapei S.p.A., Via Cafiero, 22, 20158 Milano (IT)

(84) ARIPO (BW GH GM KE LR LS MW MZ NA RW SD SL ST SZ TZ UG ZM ZW), Eurasian (AM AZ BY KG KZ RU TJ TM), European (AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR), OAPI (BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN TD TG)