Crushing Strength Test
In that test well-burnt bricks areas elected. Grind the two bed faces to give smooth, even and parallel faces. Immerse the specimen within water at room temperature. Fill up flush the frog and all voids along with cement mortar (1 part cement and 1 part clean coarse sand of grade 3 mm and down), store under damp jute bags for 24 hours and then immerse in clean water for 3 days. Remove and wipe out any traces of moisture.
Place the specimen among two plywood sheets; each 3 mm thick, along with flat faces horizontal and mortar filled face facing upwards. The specimen sand wiched between the ply sheets are carefully centered among plates of compression testing machine. Apply axial load at a uniform rate of 140 kg/cm2 per minute till failure. The maximum load at failure divided through the average area of the bed faces provides the compressive strength.