A brick is small block of burnt clay with a size that can be held in one hand conveniently. Brick should be thoroughly burnt, of uniform color, having plane rectangular faces, sharp straight, right angle edges.
- Standard Modular size of common building brick is 190X90X90 mm.
- The size of a Non-Modular brick is 9"X4-3/8"X2-11/16" (229X111X70 mm).But it is specified as 230X110X70 mm.
- The weight of a brick is about 3 to 4 kg.
Recommended Sizes of Bricks
| Type of Bricks
|| Normal Size (mm)
|| Actual Size (mm)|
| Modular Bricks
|| 200x100x100 mm
|| 190x90x90 mm|
| Non -Modular Bricks
|| 229x114x70 mm
|| 230x110x70 mm|
Visual Characteristics of Brick
- Good bricks should be burnt thoroughly so that they become hard and durable.
- Satisfactory burning of the bricks is ascertained by hard ringing sound when two bricks are struck together.
- The bricks should have smooth and rectangular shapes with sharp corners and uniform colors.
- The bricks should be free from cracks, chips, warp age, large particles of lime and organic matters.
Water Absorption of Brick
Average water absorption of bricks after 24 hours of immersion in cold water should not be more than 20% of its own dry weight.
Raw Materials for Brick
Sufficient samples of the earth available must be tested to check if the soil is suitable for composition of bricks and available abundantly in neighborhood.
It is reasonable uniformity of composition in the soil. Mechanical composition of the soil may preferably confirm the following requirements.
- Clay 20 to 35 %
- Silt 20 to 35%
- Sand 35 to 45 %
Two more types of soil can be mixed to confirm above requirements if single soil does not confirm above specification. The soil should be free from ‘Gravel Coarse Sand, Lime and Kankar particles, vegetable matters and roots etc.