Abstract
The peculiarities of the composition formation and hydraulic activity of high calcium fly ash got by burning of Kansk-Achinsk brown coals have been described. Fly ashes selected in dry state can be used as peculiar (specific) binding agents (minerals) on condition of their preliminary handling reducing nonuniform volume change of the ash stone during hydration and also the expansion range of their application in green building. The cavitation technologies, the organization of the fly ash granulation at heat power plants instead of hydraulic ash removal systems and enrichment by various means to extract rare-earth metals are considered to be the most perspective methods of fly ash conditioning.
Highlights
The peculiarities of the composition formation and hydraulic activity of high calcium fly ash got by burning of Kansk-Achinsk brown coals have been described
The present work is devoted to the problems of utilization and perspective trends of high calcium fly ashes conditioning resulting from burning of Siberian brown coals of Kansk-Achinsk basin
A specific problem present high-calcium fly-ashes (HCFA), that appear while burning brown coals and some kinds of slate coals (C class according to ASTM C618-12)
Summary
Form liquid phase and kept their amorphous structure partially or completely as a result of their prompt cooling. Fly ashes is not new source of mineral raw for building industry For many years they are used in ceramics technology, for fractional substitution of Portland cement in production of concretes and mortars, for creation of geopolymеric and other binders and composites on their bases [6,7,8,9,10]. A specific problem present high-calcium fly-ashes (HCFA), that appear while burning brown coals and some kinds of slate coals (C class according to ASTM C618-12). As usually they contain 1–40%, sometimes up to 60% calcium oxide, including that of in free form, not fixed in chemical compounds (CaO free). It causes some ecological and technological problems in removal, storage and utilization processes
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