Fly ash is a byproduct produced while burning finely ground coal in a boiler to produce electricity It is removed from the plant exhaust gases primarily by electrostatic precipitators or baghouses and secondarily by scrubber systems Physically fly ash is a very fine powdery material composed mostly of silica Nearly all particles are spherical in shape Fly ash is a pozzolan a siliceous material which in the presence of water will react with calcium hydroxide at ordinary temperatures to produce cementitious compounds SiO2 Al2O3 Fe2O3 and occasionally CaO are the main chemical components present in fly ashes
Fly ash significantly improves concrete performance in different ways and also provides many benefits in cement and noncement applications Fly Ash colour can vary from grey and dark grey yellowish tan and light to brownish
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