LAB TEST FOR DETERMINATION OF THE COMPRESSIVE STRENGTH OF BURNT CLAY BRICKS
OBJECTIVE: To determine the compressive strength of common burnt clay bricks. APPARATUS: A compressive testing machine. PROCEDURE: 1. Take a representative brick sample to be tested 2. Remove unevenness observed in the bed faces to provide two smooth and parallel faces by grinding. 3. Immerse the sample in water at room temp. For 24 hrs. 4. Remove the specimen & drain out any surplus moisture at room temp. 5. Fill the frog and all voids in the bed face flush with cement mortar(1cement:3 coarse sand) 6. Keep under the damp jute bags for 24 hours followed by immersion in clean water for 3 days. Wipe out the moisture. 7. Place the specimen with flat faces horizontal, and mortar filled face facing upwards between two 3-plywood sheets each of 3mm thickness. 8. Apply load axially at uniform rate of 14 n per sqmm. Per minute and note the maximum load at failure. 9. Compressive strength in n/ sqmm=maximum load at failure in