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Write the field tests performed on bricks for its suitability.

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Field tests performed on bricks for its suitability: 1) Shape and size: Brick is closely observed. It should be of standard size 190mm x 90mm x 90mm. Its shape should be truly rectangular with plane faces, sharp edges and right angles. 2) Water absorption test: A brick is weighed dry. It is then immersed in water for a period of 16 hours. It is weighed again and difference in weight indicates the amount of water absorbed by the brick. It should not be more than 20% of weight of dry brick. 3) Hardness: A scratch is made on brick surface with a finger nail. If no impression is left on the surface then brick is treated sufficiently hard. 4) Soundness: Two bricks are taken and they are struck with each other. Brick should not break and clear ringing sound should be produced. 5) Color Test: Brick should have copper colored and free from cracks, holes, and lumps. 6) Structure: A brick is broken and structure inside should be uniform, compact, and homogeneous. 7) Presence of soluble salts: Brick is immersed in water for 24 hours. It is then taken out and allowed to dry in shade. The absence of white deposits on its surface indicates absence of soluble salt.
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a) Shape and Size: In this, a brick is closely inspected. It should be of standard size and shape and should be truly rectangular with sharp edges.

b) Soundness: In this, when two bricks are struck with each other, clear ringing sound should be produced.

c) Hardness: In this, when a scratch is made on brick surface with the help of finger nail, no impression should be made on the brick.

d) Colour: The colour of the bricks should be reddish brown

e) Water absorption test: After immersing the bricks in water for 16 hours, it should not absorb more than 20% water of its weight.

f) Dropping test: In this test, when the burnt clay bricks are dropped flat on hard ground from a height of about 1m, it should not crush into pieces. This indicate good strength of brick.
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