1.Compressive Strength of Bricks:
According to BDS-208, take 12 bricks randomly from sample and half them and take one-half for test. The specimens shall be immersed in water at 15- 20 degree Celsius for 24 hours . After that dry them at room temperature for 5 minutes.Fill their frogs by mortar of 1:1.5 cement-sand ratio.The bricks should now stored under damp sack for 24 hours and after that it should immersed in water for 6 days before performing test.After 7 days of filling mortar, specimens will be taken out, wiped dry with damp cloth and placed with flat surface horizontally, and the mortar filled face facing upward between two number 3 plywood sheets each approximately of 3 mm thickness and carefully centered between the plates of the compression testing machine.The compression plate of the testing machine shall have a ball seating in the form of a portion of sphere, the center of each coinciding with the center of the face of the plate. The load shall be applied axially at a uniform rate of 140kg/sqcm per minute until the failure. The failure shall be deemed to have occurred when no further increase in the load is registered with unchanged rate of moving head travel.
Compressive strength (kg/sqcm or mpa or lb/sqin)= W/A
Where,
W= Maximum load indicated by machine
A= Area.
2. Water Absorption test of Bricks: To ensure good quality brick determining water absorption is very important. This test conducted to determine durability properties of bricks i.e. degree of burning, quality and behavior of bricks under weathering actions. Click here to know about this test procedure.
3. Efflorescence : Efflorescence is a whitish crystalline deposit on surface of the bricks. Usually it is the deposit of salt on brick. If soluble salt present in clay during brick molding then it causes efflorescence.
4. Measurement of Size:
5. Determining the Weight of Brick:
6.Measurement of Warpage.
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