Fly ash bricks are hi-tech well-improved quality bricks used for construction of brick masonry structures. They are used as replacement for normal clay bricks and has better properties than it.
Fly ash bricks competitive in comparison to the conventional clay bricks and provide enormous indirect benefits. The utilization of fly ash bricks results in conservation of natural resources as well as protection of environment.
Composition of Fly Ash BricksThe important compositions of fly ash bricks are:
- Fly ash
Sources of Fly Ash72% of India's power plants are coal based. These power stations generate nearly 40 million tones of fly ash annually. Fly ash contains Co2 emitted from Thermal power plants, industries using coal as a fuel emits unwanted ash and smoke from which fly ash is produced. In all the power plants and industries, they separate the fly ash by using the cyclone converter. This fly ash is then used as a raw material for manufacture of bricks.
Nature of Pollution Caused by Fly AshFly ash causes severe pollution of air and water, and its disposal gobbles up large tracts of land. Well-planned programs for proper management of fly ash are therefore being undertaken to enhance the use of fly ash in various applications, so that our already perilously imbalanced environment can be protected
Manufacture of Fly Ash Bricks
Flowchart Showing the Manufacture of Fly Ash Bricks
Benefits of Fly Ash Bricks for EnvironmentThe increase in greenhouse gases, out of which CO2 is one of the major constituents, increases the global warming year after year, causing drought and floods. The total CO2 Emissions globally account for 24,960 million tons at 1990 levels. Cement and building materials industry is one of the major contributors.
Comparison of Clay Bricks and Fly Ash Bricks
|Properties||Red Bricks/Clay Bricks||Fly Ash Bricks||Remarks|
|Density||1600-1750 kg/m3||1700-1850 kg/m3||Higher load bearing|
|Compressive strength||30-35 kg/cm2||90-100 kg/cm2||Higher load bearing|
|Dimensional stability||Very low tolerance||High tolerance||Saving in mortar up to 25%|
|Wastage during transit||Up to 10%||Less than 2%||Saving in cost up to 8%|
|Plastering||Thickness vary on the both sides of wall||Even on both sides||Saving in plaster up to 15%.|