In thermal power plants, burning pulverized coal produces fly ash, a fine powder. Fly ash is a substance made of alumina and siliceous material that, when combined with water, makes cement (Pozzolan). Fly ash creates a substance that resembles Portland cement when combined with lime and water. This qualifies fly ash as a critical component in various building materials, including hollow blocks, mosaic tiles, and blended cement. Fly ash, when added to concrete mixtures, increases the concrete’s strength and segregation, as well as makes it simpler to pump.
Source: https://coneccconcrete.com/blog/Environmental-Benefits-Flyash-AAC
