Crushing Test or Compression strength Test on stone
Compression strength test of stone is determined in this type of test.
Procedure: The sample taken for the test should be a cube of size 40mm x 40mm x 40mm or 50mmx50mmx50mm. The sides of the cubes are made smooth by dressing and polishing. The test should be carried out on dry as well as on saturated samples. For dry samples, cubes are placed in an oven at 105°C for one day and then cooled in a desiccator to room temperature. For saturated samples, specimens should be placed in water for about 72 hours and tested in a saturated condition.
Each Specimen is tested individually in the universal testing machine.
The rate of loading should be 140 kg/cm2 per minute. The load is applied until the Specimen fails.
Record this load. The Crushing strength or compressive strength is given by the formula as:
C = compressive strength
P = Load at failure
A = cross-sectional area of bearing face of the specimen
Then the average value of the six specimens is calculated and the result is recorded for that stone sample.