Question

The compressive strength of heavy-duty bricks, as per IS: 2980-1962. should be not less than
1. 400 kg/cm²
2. 175 kg/cm²
3. 100 kg/cm²
4. 75 kg/cm²

Answer 1

Correct Answer - Option 1 : 400 kg/cm²

Concept:

As per IS 2180-1988

The heavy duty bricks shall be classified on the basis of average compressive strength as given below:

Class Designation	Average compression strength
	Not less than N/mm2 (kgf/cm2 approx.)	less than N/mm2 (kgf/cm2 approx.)
40	40 (400)	45 (450)
45	45 (450)	-

 

Other Parameters mentioned in IS code:

Heavy duty burnt clay bricks shall be manufactured either by pressing or extrusion. They shall be made from a processed clay or clays blended in right proportions.

The brick shall be burnt to the correct maturing temperature of the clay or clay blend, properly soaked, annealed and cooled under controlled conditions.

When broken, the fractured surface of the brick shall show a uniformly dense structure free from large voids, laminations and lime particles.

Two bricks when struck together shall emit a clear metallic ring.