How to make Manual Clay Bricks
Research and Produced by MR Tarar
Transcript of video:
“Fired bricks are one of the longest lasting and strongest building materials They have been used since about 3000 BC in early Indus Valley cities. Sun-dried mud bricks are much older and quite satisfactory in hot dry climates. Fired bricks are much more resistant to cold and moist weather conditions.
In this video you will watch how to make manual clay bricks in India and Pakistan.
After digging the required amount of soil and ship it to the brick making site. Mixing a sufficient amount of the water to the soil to make it clay. Now testing if the soils need to be mixed with some additional amount of sand. The sand plays and important role in removing the brick from the mold. Ground preparation has been completed. Plain sandy surface with water. Before sunrise they have begun their work.
Hand molding – the tempered clay formed in the mold in such a way that it fills all the corners of the mold. Extra clay is removed either by wooden strike or hands.
The mold is then lifted up and raw brick is left on the ground. After the molding process, the bricks contain some amount of moisture in it so drying is to be done otherwise they may be cracked while burning. The drying bricks is done by the natural process. The bricks are laid in stacks. A stack consists of eight to ten stairs of bricks. And these stacks should be arranged in such a way that circulation of air between bricks is free.
The period of drying may be two to ten days. It also depends on the weather conditions. The drying yards are also prepared on the higher level than the normal ground for prevention of bricks from rain water, to remove maximum moisture from the bricks so as to save time and fuel during burning. The bricks are transported to bricks factory.
To increase the strength of your bricks so that they can be handled and stacked in greater heights in the kiln for burning without damage the kilns are large scale up to certain degree temperature. In this stage the bricks will gain hardness and strength of it is an important stage in the manufacturing of bricks. The temperature required for burning is about 1100 centigrade. If they burn beyond this limit, they will be brittle and east to break. If they burn under this limit they will not gain full strength and there is a chance to absorb moisture from the atmosphere.
Many contractors stock the bricks for rainy days because new bricks making impossible, so they use stocks in bad weather conditions. Coal and woods are being used for high temperature 1100 centigrade. Hence burning should be done properly to meet the requirements of good brick. There are intermittent and continuous kilns. Molded clay is stacked in the chambers. They are then slowly dried and burned to high temperature and cooled. One cycle of loading, burning cooling and emptying may take as much as two weeks. These processes are carried out intermittently in intermittent kilns and in cyclic order in continuous kilns.”
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