General Quality
- Bricks shall be free from cracks and flaws and nodules of free lime.
- Bricks shall have smooth rectangular faces with sharp corners.
- Bricks shall be uniform in colour.
- Frog size of a hand moulded brick having height of 90 mm or 70 mm shall be as per the figure shown below.
Dimensional Specification
|
Dimension for Modular Bricks |
||
|
Length (L), mm |
Width (W), mm |
Height (H), mm |
|
190 |
90 |
90 |
|
190 |
90 |
40 |
|
Dimension for Non-Modular Bricks |
||
|
Length (L), mm |
Width (W), mm |
Height (H), mm |
|
230 |
110 |
70 |
|
230 |
110 |
30 |
Physical Requirements
| Compressive Strength | Compressive strength of any individual brick shall not be less than the minimum compressive strength for the corresponding class of brick. (See table below) |
| Water Absorption | Shall not be more than 20% by weight up to class 12.5 and 15% by weight for higher classes. |
| Efflorescence | Shall not be more than ‘moderate’ up to class 12.5 and ‘slight’ for higher class. |
Classes of Common Burnt Clay Bricks
|
Class Designation |
Average Compressive Strength |
|
|
N/mm2 |
Kgf/cm2, (approx) |
|
|
35 |
35 |
350 |
|
30 |
30 |
300 |
|
25 |
25 |
250 |
|
20 |
20 |
200 |
|
17.5 |
17.5 |
175 |
|
15 |
15 |
150 |
|
12.5 |
12.5 |
125 |
|
10 |
10 |
100 |
|
7.5 |
7.5 |
75 |
|
5 |
5 |
50 |
|
3.5 |
3.5 |
35 |
how can i find burnt bricks dimension with proper method for laboratory purpose ?