Bricks are blocks of tampered clay.
A good brick earth should preferably conform to the following composition.
Clay (Alumina) 20 to 30% by weight
Silt 20 to 35% by weight
Sand 35 to 50% by weight
Functions Of Constituents.
1-silica or sand
Its presence in clay produces hardness, Resistance to heat, durability and pervents shrinkage and warping.
2-Alumina
It is plastic when wet, and is capable of being moulded to any shape.On drying it loses its plasticity and becomes hard, shrinks, warps and cracks.
3-Lime
It reduces shrinkage of bricks.
It results in binding the particles of Bricks together resulting in greater strength of Brick.
4-Magnesia
The presence of small quantity of manganese with Iron will give the Brick darker or even Black colour.
5-Oxide Of Iron
It influences the colour of Bricks.
A good brick earth should preferably conform to the following composition.
Clay (Alumina) 20 to 30% by weight
Silt 20 to 35% by weight
Sand 35 to 50% by weight
Functions Of Constituents.
1-silica or sand
Its presence in clay produces hardness, Resistance to heat, durability and pervents shrinkage and warping.
2-Alumina
It is plastic when wet, and is capable of being moulded to any shape.On drying it loses its plasticity and becomes hard, shrinks, warps and cracks.
3-Lime
It reduces shrinkage of bricks.
It results in binding the particles of Bricks together resulting in greater strength of Brick.
4-Magnesia
The presence of small quantity of manganese with Iron will give the Brick darker or even Black colour.
5-Oxide Of Iron
It influences the colour of Bricks.
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