Fly ash bricks are environmentally friendly bricks which can be used as an alternative to the country made red clay bricks. These bricks are produced from a thermal powerplant fly ash and industrial by product called Quarry dust. Cement or Lime, Gypsum used as the binding material.
As compare to regular fire clay bricks, fly ash bricks have greater compressive strength.
It has a good earthquake resisting property.
It increases the strength of the structure.
Fly ash bricks are good in fire-resisting than regular fire clay bricks.
The main ingredient of fly ash bricks is fly ash, and it comes from the thermal power plant. So, it doesn’t damage the environment again; that’s why it’s an environmentally friendly product.
Fly ash bricks have decent sound insulation property than ordinary bricks.
Those bricks are generally available near the thermal power station areas, but now days, it’s nearly available in all the places.
As compare to regular fire clay bricks, fly ash bricks have greater compressive strength.
It has a good earthquake resisting property.
It increases the strength of the structure.
The key thing about these fly ash bricks is its appearance.
Fly ash bricks are cement-like color, smooth, even surface, and uniform finish. Due to the smooth surface, the amount of plaster is reduced to 40% than common plastering.
Plaster of Paris or putty can be applied directly on this.
Those bricks are free from organic matter, pebbles, etc.
These fly ash bricks are highly durable but less permeable.
Due to lower permeability, it reduces the efflorescence effect on brick.
These bricks prevent dampness on the wall because it is less porous.
It’s highly resistive against acid, water, and sulphate.
| 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 |
| Absorption | 15-25% | 10-14% | Less dampness |
| 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% |
Comparatively less in price compares to clay bricks. Fly Ash bricks available in many places without affecting environmental.
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