Slag-based hydraulic binder, dry mortar composition comprising same and system for activating a slag-based binder

(22) 05.03.2021

(43) 16.09.2021

(57) The aim of the invention is to provide a hydraulic binder based on ground granulated blast-furnace slag, devoid of Portland cement, which enables improved setting and hardening. For this purpose, the invention concerns a hydraulic binder comprising (in % by weight on a dry basis): A. at least 50 of at least one ground granulated blast-furnace slag; B. more than 5 of at least one calcium aluminate cement and/or of at least one calcium sulfoaluminate cement; C. more than 5 of at least one source of sulfate ions; D. between 1 and 5 of Ca(OH)₂ and/or of Portland cement; E. between 0.01 and 1 of at least one alkali metal carbonate, preferably Li₂CO₃; F. and at least one alkalifying reagent consisting of at least one alkali metal carbonate and/or bicarbonate, different from E, (NaHCO₃; Na₂CO₃; K₂CO₃ and mixtures thereof); with the conditions whereby: (i) the amount of C is sufficient that the sulfate ions of C can react with B and with A; (ii) the amount of F is sufficient that reaction thereof with component D in the presence of water brings the pH of the wet formulation obtained to a value of not less than 12, for a water-to-mortar mixing rate of between 10 and 35 % by weight.

(71) Sika Technology AG, Zugerstrasse 50, 6340 Baar (CH)

(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, TE, 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)