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Advantages of Fly Ash

  • Flyash bricks are light weight material compared to clay bricks, so it is suitable for multi storey building, Less weight means Less stress on building , safety assured.
  • Low absorption of heat, FAB (fly ash bricks) absorbs less heat than normal bricks, it keeps your building cool even in summer, hence most suitable for Indian conditions.
  • Thermal conductivity is 0.90-1.05 W/m2 ºC (20-30% less than those of concrete blocks). These bricks do not absorb heat; they reflect heat and gives maximum light reflection without glare.
  • Less mortar required in construction and saves 20% morar, because all bricks are machine made and even in shape.
  • High compressive strength compared to normal bricks which is [70-150kg/cm2].
  • Less porous, absorbs very little water, whereas burnt clay bricks absorbs more water during construction. Saves money on water and 20% water usage during construction and even keeps your building strong during rainy seasons.
  • Fly ash by mixing efficiently with the concrete mix can replace Portland cement that in turn can aid in making big savings in concrete material prices.
  • It is an environmentally-friendly solution.
  • It improves the strength over time and offering greater strength to the building.
  • Increased density and also the long-term strengthening action of flash that ties up with free lime and thus, results in lower bleed channels and also decreases the permeability.
  • The reduced permeability of concrete by using fly ash, also aids to keep aggressive composites on the surface where the damaging action is reduced. It is also highly resistant to attack by mild acid, water and sulfate.
  • It effectively combines with alkalis from cement, which thereby prevents the destructive expansion.
  • It is also helpful in reducing the heat of hydration. The pozzolanic reaction in between lime and fly ash will significantly generate less heat and thus, prevents thermal cracking.
  • It chemically and effectively binds salts and free lime, which can create efflorescence. The lower permeability of fly ash concrete can efficiently reduce the effects of efflorescence.
  • The cost of these brick will come down significantly if Ash producers like power plants start making them with automated systems ensuring highest quality and consistency and gaining from economies of scale.

Fly Ash Bricks V/S Red Bricks

  fly-ash-brick1 red-bricks
Characteristics Fly Ash bricks Red Bricks
Compressive Strength strength1
70-120 Kg/cm2
strength
30-60 Kg/cm2
Water Absorption water1
10-12%
water
15-20%
Appreance appearance
Uniform
appearance1
Non-Uniform
Wastage fly-ash-wastage
1%
red-bricks-wastage
3-4%
Requirement of Plaster plaster-fb
Less
plaster-rb
More
Requirement of Mortal mortal-on-fb
Less
mortal-on-rb
More
Eco-Friendly fb
Yes, Uses Fly Ash No Chimney Required
rb
No, Uses Fertile Soil, Chimney Required

Eco Friendly Bricks

Fly Ash is a By-Product of coal based thermal power stations. With the increasing number of thermal power stations, the disposal of Fly Ash is becoming serious concern for environmentalists. To overcome this problem the construction industry came up with the idea of formulating concrete out of Fly Ash and utilising it for making Fly Ash Bricks. Also production of Fly Ash Bricks saves agricultural land which is destroyed by making clay or Red Bricks. At the same time Fly ash Bricks have favourable characteristics such as high compressive strength, no emission of green house gases during production, durability, and a solution to prevent environmental pollution.

Market Drivers & Raw Material Proposition



Proportioning of raw materials is an important aspect of ensuring quality of ash bricks, pavers and blocks. The proportioning will depend on the quality of the raw materials and the class of brick required. The following mix proportion is being adopted.
The strength of bricks manufactured with the above proportion is generally of the order 7.5 to 10.0 N/sq.mm after 28 days.

For Fly Ash, Sand/Stone dust, Sludge Lime and Gypsum bricks:

  • Fly ash 55-60%
  • Sand/Stone dust 20-25%
  • Sludge lime 15-20%
  • Gypsum 5%

For Fly Ash, Sand/Stone dust, Hydrated Lime and Gypsum bricks:

  • Fly ash 60-65%
  • Sand/Stone dust 18-27%
  • Hydrated lime 8-12%
  • Gypsum 5%

For Fly Ash, Sand/Stone dust and Cement bricks:

  • Fly ash 50-60%
  • Sand/Stone dust 32-40%
  • Cement 8-10%
  • Gypsum 5%
Note: Mix proportion as suggested above can be used as guide lines. Mix proportion largely depends upon characteristics and quality of raw materials used. Based on the qualities of raw materials, the exact mix proportion may be finalized by trial mixes to produce good quality bricks of required compressive strength.

Location

107,GIDC Estate, Nagor Road, Bhuj-370001, Gujarat, India

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