What is flyash and what does it do?
Flyash is a by-product of coal-fired electric generating plants. Primarily there are two classifications of flyash that are produced, according to the type of coal used. Anthracite and bituminous coal produces flyash classified as Class F. Burning lignite or subbituminous coal produces class C flyash. Using flyash in concrete is environmentally friendly because it is a by-product, it normally would be put to waste, but it is instead used in a constructive way. While flyash offers environmental advantages, it also improves the performance and quality of concrete. Flyash affects the quality of concrete by improving workability, reducing water necessity, reducing segregation and bleeding, and lowering heat of hydration. Flyash increases strength, reduces permeability, reduces corrosion of reinforcing steel, increases sulphate resistance, and reduces alkali-aggregate reaction.
