The sound of the bell is a sign of health, plumpness and resistance and a small amount of water absorption.
Hollow bricks in Palakkad should withstand fire and not become a paste or melt. The color of a good brick should be uniform and its surface should also be smooth and void-free.
The hardness of the brick should be such that it does not scratch the nail.
7 regarding clay bricks, bricks are divided into two groups, manual and machine-made, hand-made bricks are divided into two types: pressed and white Cossack, and machine-made bricks are also grouped into solid and perforated.
According to the Iranian standard, the water absorption rate in manual bricks is maximum 20%, in machine bricks 16% and at least 8% for both types of bricks.
The bricks used in the facade must have the following specifications:
Appearance defects: Ajrnama should be free of appearance defects such as cracking, scaling, etc.
Dimensions and sizes: The length, width and thickness of different bricks should be according to table number one.
It should be kept in mind that the tolerance mentioned about the brick face will be worn and uniform during execution by a special machine.
Brick edges: The line of intersection of brick surfaces should be straight and their intersection angles should be vertical and their surfaces should be smooth.
In perforated bricks: the holes should be perpendicular to the large surface of the brick and uniformly distributed on its surface, and their total area should be 24 to 40% of the surface of the bricks.
Then, the diameter of square holes and circular holes should be limited to 26 mm, and the thickness of the wall between the hole and the edge of the brick should be more than 15 mm, and the distance between the two holes should be more than 10 mm.
Specific weight: both types of machine and manual bricks should not be less than 1.7 and their spatial specific weight should not be less than 1.3 grams per cubic centimeter.
Resistance to freezing: the bricks used in the facade should be stable against freezing and should not suffer damage to the appearance such as flaking, cracking and corrosion in the freezing test.
Water absorption coefficient: The weight percentage of water absorption in a 24-hour test should not exceed 16 in the case of machine bricks and 20 in the case of manual bricks, and should be less than 8 in both types of bricks.
Thin brick pieces (double-faced brick) used in facade construction with dimensions of 20*200 (40 or 30)*200 mm are made with 20 or 30 mm thin brick mosaic pieces with a pattern of several drawn brick bands (mosaic bricks) at least they must have specifications Machine-made bricks with medium strength are included in Iranian Standard No.
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