Ajr Lefton or perforated brick is a type of brick that has been reduced by 25% of the volume of the brick by the holes created in it.
Ajr Lefton is made of materials such as clay, shale soil and soil Fireproof is obtained. And the noteworthy point here is that most of the production of Lefton bricks is made with clay because the price of shale and refractory Lefton bricks is much higher than the price of clay Lefton bricks. And it is available in the market and it can be used in the construction of external walls without the need for facades. A wall made with Lefton bricks is no different from a wall that is made of clay bricks. Lefton bricks are available in different colors in the market, such as yellow Lefton bricks, red Lefton bricks, and Lefton bricks. Per Tagali pointed out that Golbehi Lefton brick and Coffee Lefton brick are the most widely used bricks, Yellow and Red Lefton bricks and the reason is that the price of Yellow Lefton brick and the price of Red Lefton brick are more suitable than other types of bricks. Isfahan Lefton brick has 10 holes, the diameter of each hole is between 2 and 3 cm. In the three-flower brick, which has three holes, the diameter of each hole is about 4.5 cm.
What is the reason for the hole in the Lefton brick?
• Basically, the weight of bricks is high. Therefore, the cost of transporting bricks to the construction site becomes significant. So that sometimes the cost of transporting Lefton bricks is higher than the price of Lefton bricks at the factory door. In order to reduce the weight of the brick, holes are made in it. In addition, by creating holes, less raw materials are used to produce Lefton bricks.
As you know, Lefton bricks have high compressive strength. Especially compared to the cement sand mortar that is used between the bricks. So practically, the presence of holes does not have much effect on their structural value. In addition, the role of bricks is no longer similar to that of centuries ago, when they were used as main structural components in the foundations of buildings and load-bearing walls. For decades, the structural role of the building has been the responsibility of the concrete or metal skeleton of the building.
Brick plays the role of shell and separator in most of today's buildings. Due to this resistance, brick is not very influential in today's buildings. This is one of the reasons for the popularity of clay bricks.
• In the production of Lefton bricks, first the brick is dried with gentle heat, then it is fully baked. The presence of holes in the brick makes the brick completely dry. Also, during the baking stage, the central parts of the brick should also get enough heat. This issue is very effective in the resistance and homogeneity of Lefton brick. The presence of holes and the uniform baking of the bricks due to them prevent the creation of cracks inside the Lefton brick. The absence of small cracks inside the brick reduces the ability of the brick to transmit water to the inner surfaces of the wall or the same (capillary attraction). It is pressed on soft mortar. The mortar slightly penetrates into the holes and takes their shape. This causes more adhesion of mortar and bricks. Also, the brick's resistance to displacement due to lateral forces on it increases.
