Fly ash is a type of pozzolan formed by the burning of pulverised coal. The fly ash is a fine amorphous powder, rich in alumina and silica generated through separation methods such as electrostatic, mechanical etc. The fly ash is a predominant material in the construction industry and used as an admixture.
Fly ash can be used as prime material in many cement-based products, such as poured concrete, concrete block, and brick. One of the most common uses of fly ash is in Portland cement concrete pavement or PCC pavement. Road construction projects using PCC can use a great deal of concrete, and substituting fly ash provides significant economic benefits. Fly ash has also been used as embankment and mine fill. Fly ash can be a cost-effective substitute for Portland cement in many markets. Fly ash is also recognized as an environmentally friendly material because it is a byproduct and has low embodied energy, the measure of how much energy is consumed in producing and shipping a building material.
The two major reasons for use of fly ash as an ingredient in building materials and concrete are because it improves the quality of finished products and breeds significant environmental benefits. This has led to major use of fly ash in the constructional activities. Hence, the factors responsible for growth of fly ash market are growing urbanization in emerging economies and increasing constructional activities globally.
Fly ash bricks as the name signifies, is made from fly ash generated from the thermal power stations along with lime and gypsum. Pulverized fuel ash is called fly ash and is mostly generated from thermal power stations where it is generated by burning of coal.
There has been rising problem of pollution worldwide, fly ash bricks reduces the problem of pollution by utilizing the fly ash produced from thermal power plants which might otherwise be a problem in disposal. Moreover, the conventional red bricks need to be burned in kilns and huge amount of coal is burned for the process, thus, adding to greenhouse effects caused by carbon dioxide emissions.
Additionally, other numerous benefits such as low water absorption, light weightedness and other properties have added to the significant popularity of fly ash bricks in the global market.