Compressive Strength of Brick ~ MECHTECH GURU
Compressive Strength of Brick

Compressive Strength of Brick

April 11, 2021

Compressive Strength of Brick

AIM: - Compressive Strength of Brick

OBJECTIVE: -To determine Compressive Strength of brick

APPARATUS:- A Compressive testing machine , Bricks, Vernier Caliper, plywood cover etc.

Bricks are used in construction of either load bearing walls or in portion walls in case of frame structure. In load bearing walls total weight from slab and upper floor comes directly through brick and then it is transferred to the foundation. In case the bricks are loaded with compressive nature of force on other hand in case of frame structure bricks are used only for construction of partition walls, layers comes directly on the lower layers or wall. In this case bricks are loaded with compressive nature of force. Hence for safety measures before using the bricks in actual practice they have to be tested in laboratory for their compressive strength. The usual crushing strength of common hand molded well burnt bricks is @ 5 to 10 N/mm2 varying according to the nature of preparation of the clay. Pressed and machine molded bricks made of thoroughly plugged clay are much stronger than common hand molded bricks made from carelessly prepared clay. PROCEDURE: - 1. Take 5 Bricks and remove unevenness observed in the bed faces to provide two smooth and parallel faces by grinding. 2. Measure it’s all dimensions. (L X B X H) 3. Fill the frog ( where provided ) and all voids in the bed face flush with cement mortar ( 1 cement, 1 clean course sand of grade 3mm ) 4. Store under the bricks for 24 hours. 5. place the specimen with flat faces horizontal and mortar filled face facing upwards between the two plywood sheet each 3 mm thickness and carefully centered between plates of the testing machine. 6. Apply load axially of a uniform rate. 7. 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 for application of load.


THEORY: - Bricks are used in construction of either load bearing walls or in portion walls in case of frame structure. In load bearing walls total weight from slab and upper floor comes directly through brick and then it is transferred to the foundation. In case the bricks are loaded with compressive nature of force on other hand in case of frame structure bricks are used only for construction of partition walls, layers comes directly on the lower layers or wall. In this case bricks are loaded with compressive nature of force. Hence for safety measures before using the bricks in actual practice they have to be tested in laboratory for their compressive strength. The usual crushing strength of common hand molded well burnt bricks is @ 5 to 10 N/mm2 varying according to the nature of preparation of the clay. Pressed and machine molded bricks made of thoroughly plugged clay are much stronger than common hand molded bricks made from carelessly prepared clay.

PROCEDURE: -

1. Take 5 Bricks and remove unevenness observed in the bed faces to provide two smooth and parallel faces by grinding.

2. Measure it’s all dimensions. (L X B X H)

3. Fill the frog ( where provided ) and all voids in the bed face flush with cement mortar ( 1 cement, 1 clean course sand of grade 3mm )

4. Store under the bricks for 24 hours.

5. place the specimen with flat faces horizontal and mortar filled face facing upwards between the two plywood sheet each 3 mm thickness and carefully centered between plates of the testing machine.

6. Apply load axially of a uniform rate.

7. 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 for application of load.

OBSERVATION TABLE:-

Bricks are used in construction of either load bearing walls or in portion walls in case of frame structure. In load bearing walls total weight from slab and upper floor comes directly through brick and then it is transferred to the foundation. In case the bricks are loaded with compressive nature of force on other hand in case of frame structure bricks are used only for construction of partition walls, layers comes directly on the lower layers or wall. In this case bricks are loaded with compressive nature of force. Hence for safety measures before using the bricks in actual practice they have to be tested in laboratory for their compressive strength. The usual crushing strength of common hand molded well burnt bricks is @ 5 to 10 N/mm2 varying according to the nature of preparation of the clay. Pressed and machine molded bricks made of thoroughly plugged clay are much stronger than common hand molded bricks made from carelessly prepared clay. PROCEDURE: - 1. Take 5 Bricks and remove unevenness observed in the bed faces to provide two smooth and parallel faces by grinding. 2. Measure it’s all dimensions. (L X B X H) 3. Fill the frog ( where provided ) and all voids in the bed face flush with cement mortar ( 1 cement, 1 clean course sand of grade 3mm ) 4. Store under the bricks for 24 hours. 5. place the specimen with flat faces horizontal and mortar filled face facing upwards between the two plywood sheet each 3 mm thickness and carefully centered between plates of the testing machine. 6. Apply load axially of a uniform rate. 7. 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 for application of load.


CALCULATION:-

Bricks are used in construction of either load bearing walls or in portion walls in case of frame structure. In load bearing walls total weight from slab and upper floor comes directly through brick and then it is transferred to the foundation. In case the bricks are loaded with compressive nature of force on other hand in case of frame structure bricks are used only for construction of partition walls, layers comes directly on the lower layers or wall. In this case bricks are loaded with compressive nature of force. Hence for safety measures before using the bricks in actual practice they have to be tested in laboratory for their compressive strength. The usual crushing strength of common hand molded well burnt bricks is @ 5 to 10 N/mm2 varying according to the nature of preparation of the clay. Pressed and machine molded bricks made of thoroughly plugged clay are much stronger than common hand molded bricks made from carelessly prepared clay. PROCEDURE: - 1. Take 5 Bricks and remove unevenness observed in the bed faces to provide two smooth and parallel faces by grinding. 2. Measure it’s all dimensions. (L X B X H) 3. Fill the frog ( where provided ) and all voids in the bed face flush with cement mortar ( 1 cement, 1 clean course sand of grade 3mm ) 4. Store under the bricks for 24 hours. 5. place the specimen with flat faces horizontal and mortar filled face facing upwards between the two plywood sheet each 3 mm thickness and carefully centered between plates of the testing machine. 6. Apply load axially of a uniform rate. 7. 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 for application of load.


RESULT: - 

The average compressive strength of new brick sample is found to be………. N/mm2

PRECAUTION: - 

1) Measure the dimensions of Brick accurately

2) Specimen should be placed on the of 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

CONCLUSION:

 The given sample can be used / cannot be used as building

material

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