SIZE AND WEIGHT OF BRICKS
The bricks are prepared in various sizes. The custom in the locality is the governing factor for deciding the size of a brick. Such bricks are not standardized are known as the traditional bricks.
It bricks are large it is difficult to burn them properly and they become too heavy to be placed with a single hand. On the other hand if bricks are small more quantity of mortar is required.
For India a brick of standard size 190 mm x 90 mm x 90 mm is recommended by BIS. With mortar thickness the size of such a brick becomes 20 mm x 10 mm x 10 mm and it is known as the nominal size of the modular bricks. Thus the nominal size of brick includes the mortar thickness.
It is found that the weight of 1 m3 of brick earth is about 18 KN. Hence the average weight of a brick will be about 30 to 35 N.
FACTORS AFFECTING QUALITY OF BRICKS
Following factors affect the quality of bricks-
- Composition of brick earth
- Preparation of clay and blending of ingredient
- Nature of moulding adopted
- Care taken in drying and stacking of raw or green bricks
- Types of kiln used including type of fuel and its feeding
- Burning and cooling processes
- Care taken in including
It is thus obvious that not only the bricks of different brick fields will have different strength, but in the same brick field, the bricks of the same batch may have different strengths.
The average crushing strength and tensile strength of hand moulded bricks are 60000 KN/m2 and 2000 KN/m2 respectively. In practice however the 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.
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