Compressive test of bricks

This presentation includes slides about the compressive strength test of bricks

1. EXPERIMENT NO: II COMPRESSIVE STRENGTH OF BRICKS By: Er. Sonia Verma Gold Medalist ( M.Tech , Structural Engineering) 95926-99627, [email protected]

2. AIM To determine compressive strength of bricks.

3. APPARATUS A compression testing machine, scale, plywood cover

4. THEORY Bricks are mostly subjected to compression and rarely to tension. The usual crushing strength of common hand moulded well burnt bricks is @ 5 to 10 N/mm 2 varying according to the nature of preparation of clay pressed and machine moulded bricks made of thoroughly pugged clay are much stronger than common hand moulded bricks made from carelessly prepared clay. In all the brick walls the compressive strength of bricks decides the thickness of walls hence it is necessary to test the compressive strength of the bricks.

5. PROCEDURE Take 5 bricks and remove unevenness observed in the bed face to provide two smooth and parallel faces by grinding. Immerse the bricks in water at room temperature for 24 hours Remove the specimen and drain out any surplus moisture at room temperature Fill the frog (where provided) and all voids in the bed face flush with cement mortar ( 1 cement, 1 clean coarse sand of grade 3 mm and down.) Store under the damp jute box for 24 hours

6. Bricks immersed in water

7. Frogs filled

8. Procedure contd … 6. Remove and wipe out traces of moisture and place the specimen with flat faces horizontal and mortar filled few facing upwards between two plywood sheet each 3 mm thickness and carefully centered between plates of testing machine. 7. Apply load axially of uniform rate. 8. Note down the load at failure. That load shall be the maximum load at which the specimen fails to produce any further increase in the indicator reading on the testing machine . Note : In place of plywood sheets plaster of paris may be used to ensure a uniform surface of application of load