Fly ash bricks are made from the wastes of thermal power plants, which include fly ash,
gypsum, lime, sand, water and stone aggregates. The fly ash used is either Class C or Class F, and
the stone aggregates used are less than 6 mm. Fly ash is collected from the residue of burnt coal
The fly ash produced from coal combustion is in the form of fine particles and contains toxic
metals like mercury, arsenic, lead, antimony, and chromium. But once fly ash gets converted
into fly ash bricks, it doesn’t emit any mercury or any radiation. Instead, it absorbs a small
amount of the air and makes it cleaner.
4.Following the compaction stroke, the lid is opened, and the bricks are ejected for curing.
The stack is coated with wet gunny cloth, and water is sprinkled three to four times per
day to keep the entire stack moist. The bricks are cured for 28 days before being allowed
to dry in the open air for four weeks before being tested.
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