AQUEOUS SUSPENSION BASED ON ALKALINE ALUMINIUM POLYSULPHATE, PREPARATION METHOD AND USE IN THE FIELD OF BUILDING MATERIALS

摘要

The invention concerns an aqueous suspension comprising: A) silica and/or alumina particles; and B) a compound of global formula (I): Al(OH)a(SO4)b(SiOx)c(Y)d with: a ranging between 0.4 and 2; b ranging between 0.3 and 1.35; c ranging between 0 and 0.1; d being more than 0.05; Y selected among the alkaline and alkaline-earth metals; x ranging between 2 and 4, and its derivatives. Said compound (B) being present in the suspension at a concentration of at least 1.65 mol/l expressed in aluminium mol derived from said compound. It also concerns a method useful for preparing said suspension and their uses in the field of cement pastes, mortars and concrete and particularly as setting and hardening accelerator of cements.