Following factors affecting the strength and quality of bricks-
1. Composition of brick making earth.
2. Preparation of clay and blending of ingredients.
3. Nature of moulding adopted.
4. Care taken in drying and stacking of raw or green bricks.
5. Types of kilns used including types of fuel and its feeding.
6. Burning and cooling process.
7. Care taken in unloading.
It
is thus obvious that not only the bricks of different brick field will
have different strength, but in the same brick field, the bricks of the
same batch may have different strength.
The
average crushing strength and tensile strength of hand moulded bricks
are 60000 kN/m2 and 2000 kN/m2 respectively. The shearing strength of
bricks are not subjected to the tensile stresses.
It
may be noted that the strength of brickwork mainly depends on the types
of mortar used and not so much on the individual strength of the
bricks.
