DETERMINATION OF COMPRESSIVE STRENGTH OF BRICKS APPARATUS



DETERMINATION OF COMPRESSIVE STRENGTH OF BRICKS
APPARATUS
Ø  Compression Testing Machine
Ø  Measuring Tape or Scale
Ø  Surface Grinder
Ø  Plywood Sheets
SPECIMENS
Two numbers of whole bricks from each sample collected should be taken the dimensions should be measured to the nearest 1mm.
SAMPLING
Ø  Remove unevenness observed the bed faces to provide two smooth parallel faces by grinding.
Ø  Immerse in water at room temperature for 24 hours.
Ø  Remove the specimen and drain out any surplus moisture at room temperature.
Ø  Fill the frog and all voids in the bed faces flush with cement mortar (1 cement, 1 clean coarse sand of grade 3mm and down).
Ø  Store it under the damp jute bags for 24 hours filled by immersion in clean water for 3 days.
Ø  Remove and wipe out any traces of moisture.
PROCEDURE
Ø  Place the specimen with flat face s horizontal and mortar filled face facing upwards between two 3-ply wood sheets of each 3mm thickness and carefully centred between plates of the testing machine.
Ø  Apply load axially at a uniform rate of 14 (N/mm2) 140 (Kg/cm2) per minute till failure occurs and note maximum load at failure.
Ø  The load at failure is maximum load at which the specimen fails to produce any further increase in the indicator reading on the testing machine.
TESTING


CALCULATION
The average of result shall be reported.

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