FLY ASH VS. RED BRICKS

COMPARISON

Fly Ash Bricks

Red Bricks

Remarks
Compressive Strength of Brick
Above 70 %
30 - 40 %
Depends on  recipe
Size & Shape
Uniform
Not Uniform

Water Absorption
15 - 25 %
20 - 35 %
Depend on recipe
Drying Shrinkage
< 0.15%


Efflorescence
No effect
Get weaker due to climatic effects

Choice of Density
Above 1200 Kg/cm2
Not Possible

Weight of Brick
2.7 - 3.0 Kg 
2.5 - 2.7 Kg

Mortar Saving
Upto 20 % less mortar is required
Non uniform shape causing heavy wastage of mortar

Plaster Saving
Upto 50 % saving while plastering
Irregular & uneven wall surface require thick plastering

Thermal Insulation
Better than Red bricks
Not so good

Breakage
3 - 4 %
10 - 15 %