COMPRESSIVE STRENGTH OF BRICK

(IS: 1077 -1973)

 

OBJECT: To determine the compressive strength of brick as per (IS: 1077 -1973).

 

APPARATUS: Bricks, cement, sand, water, trowel, CTM.

 

THEORY:

Bricks are used in the construction of either load-bearing walls or in portion walls in case of the frame structure. In bad bearing walls, total weight from the slab and upper floor comes directly through brick, and then it is transversed to the foundation. In case the bricks are loaded with the compressive nature of force on other hand in case of frame structure bricks are used only for the construction of portion walls, layers come directly on the lower layers or wall. In this case, bricks are loaded with the compressive nature of force. Hence for safety measures before using the bricks in actual practice they have to be tested in the laboratory for their compressive strength.

 

PROCEDURE:

1.         Select some brick with uniform shape and size.

2.         Immerse the bricks in the water at room temperature for 24 hrs.

3.         Take out the bricks and wipe out the surplus water from the surface

3.         Now fill the frog portion of the brick with 1:3 cement mortar.

4.         Store the bricks under damp gunny bags for 24 hrs followed by immersion in water for 3 days i.e., 72 hrs.

4.         Place the brick keeping mortar filled frog portion upward and carefully center them between the plates of the testing machine.

5.         Apply the load at a uniform rate until the brick fails.

6.         Also, place 3mm ply on both sides of the surface for the equivalent surface. 

 CALCULATION: -                  Max. Load at failure

Compressive Strength =          -----------------------------

                                                   Loaded Area of brick

RESULT:

The average compressive strength of the brick sample is …………. Kg/cm².

 

PRECAUTION-

1)         Measure the dimensions of Brick accurately.

2)         The specimen should be placed as for as possible in the lower plate.

3)         The range of the gauge fitted on the machine should not be more than double the breaking load of specimen for reliable results.

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