Civil Engineering ⇒ Topic : Bricks and tiles
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Ayaan
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These are blocks of tempered plastic moulded
to suitable shapes. They are dried in sun and then
burnt so as to make them strong, hard and durable.
Bricks are classified into three parts :- Class (I) bricks - Characters : 1. Uniform color 2. Plane rectangular face 3. Parallel sides 4. Sharp straight right angled edges 5. Compact 6. Uniform texture Class (II) bricks - Characters : 1. Slightly over burnt 2. Distorted round edge 3. Fine 4. Compact 5. Uniform texture Class (III) bricks - Characters : .1 Slightly over burnt or under burnt 2. Defects of uniformity Water absorption of bricks after 24 hours immersion in cold water should be upto Class (I) bricks = 20% by weight Class (II) bricks = 20% by weight Class (III) bricks = 25% by weight The main constituents of earth for brick making are : 1. Silica or sand 2. Alumina or clay 3. Lime 4. Magnesia 5. Oxide of iron Fire bricks These bricks are generally made of fine clay or refractory clay and burnt at high temperature in special type of kiln. The composition of fire clay is Silica = 56 to 96% Alumina = 2 to 36% Iron oxide = 2 to 5% Lime magnesia, potash and soda = 8 to 20% Manufacture of Bricks There are three steps involved in it are 1. Preparation of earth which involves digging, weathering, blending and tempering. 2. Moulding can be done by hand or machine 3. Burning the moulded bricks in kiln | |
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