Differential thermal analysis and thermogravimetry were used to evaluate the effect of some additives, such as CaSO_4, CaCl_2 and silica fume amorphous silica from ferrosilicon synthesis on the mechanism and kinetics of reactions occurring in fly ash-Ca(OH)_2 system. The accelerating role of these additives was demonstrated from the data relating to Ca(OH)_2 consumption in hydrated pastes, determined by TG measurements.
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