Brine sludge activated silico-manganese fume based binary alkali activated binder

Abstract

A method of producing concrete, including: mixing natural pozzolan, silico-manganese fume, a coarse aggregate, and a fine aggregate to form a dry powder; and mixing an alkaline activator with the dry powder to form the concrete, the alkaline activator including sodium silicate and brine sludge, where: a density of the brine sludge is about 100 kg/m3 or more, a ratio of the sodium silicate to the brine sludge is about 2.5 to 1 by mass, and an oxide composition of the brine sludge includes 15-20 wt % CaO, 2-6 wt % MgO, 0.5-2 wt % SrO, 0.5-2 wt % Fe2O3, 0.5-1.5 wt % SiO2, 0-0.5 wt % SO3, 12-18 wt % Na2O, 7-10 wt % BaO, 2-5 wt % Al2O3, 0.25-1 wt % K2O, and 5-10 wt % Cl, determined according to ASTM C114, and a loss on ignition (LOI) of 35-45 wt %, determined according to ASTM C114.

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