Bricks and Its composition
COMPOSITION OF BRICKS
2> silica (50-60%)
3> lime (4-5%)
4> oxide of iron (5-6%)
5> magnesia (<1%)
1> Alumina
it imparts plasticity to the brick earth ,in so that it can be easily mould into required shape and size . if it is in excess it causes shrinkage and warping during drying and bricks becomes too hard when it burnt and break easily .
2> Silica
It prevents cracking ,shrinkage and warping of the bricks ,thus imparts uniform shape and size to the bricks .If it is in excess ,it destroy the cohesion between the particle due to which brick become brittle .
3>Lime
it also prevent shrinkage of the bricks ,if it is in excess it causes the bricks to melt .hence result in their lost shape .During burning process lumps of the lime are converted into quick lime that undergoes slaking in the presence of the moisture resulting in the increased volume thereby leading to the cracking are splitting of the bricks .
4> Oxides of iron
it helps in fusion of lime and silica with each other,moreover it also imparts reddish brown shade to the bricks .
5>Magnesium oxide
it impart yellow shade to the bricks and avoids the shrinkage in bricks .if it is in excess it leads to decay of bricks .
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