In this article, we are going to Discuss the operations involved in the manufacture of bricks as construction materials so read and improve your knowledge with Civil Experience
Step by Step Process of Manufacturing Bricks
What is the process of making bricks or Operations involved in the manufacturing process of bricks are listed below
A) Preparation of Clay
The preparation of clay for bricks involves the following processes:
The topmost layer of soil (about 200-300 mm) is taken out and discarded since the top clay layer is full of impurities.
Clay is then dug out from the ground. This clay is then spread on the ground.
Clay obtained from the dug hole is cleaned of stones, pebbles, vegetable matter etc. The lumps of clay are crushed to powder form.
The clay is then left in the atmosphere for mellowing. This period of exposure varies from few weeks to full season.
After weathering, ingredients are added to clay and blending brings about a homogeneous mixture.
Here water is the required quantity is added to clay and the resulting mixture is then kneaded. Tempering is done thoroughly to have a homogeneous mass.
The clay so obtained in the above process is then moulded.
Moulding can either be done with hands or with the machine.
Since bricks shrink during drying and burning and thus moulds are made larger than the size of fully burnt bricks.
- During moulding, a central depression of about 10 mm to 20 mm is made which acts as a key for mortar joint and also can be used to embross the name of the manufacture
Damp bricks when burnt show cracking and their shape gets distorted.
Thus bricks are dried before burning.
- While drying, bricks are so dried that there should be free circulation of air.
- The drying beds for bricks are kept slightly above the finished ground level.
- The period of drying varies from 3 to 10 days.
It imparts strength and hardness to bricks. Bricks should neither be under brunt nor over burnt. Under burnt bricks are soft while over burnt bricks are brittle.
- Bricks are burnt at about 1100°C. At 650°C, organic matter present in the brick gets oxidized.
- Beyond 1100°C, bricks get converted into fusible glassy mass and bricks are said to be vitrified.
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