Answer / jai.vignesh

first class bricks = Between 7 to 10 N/mm2
Second class bricks= Between 3 to 7 N/mm2
Third class bricks = Less than 3 N/mm2 (should not used)

Answer / karthik

For First class bricks - Compressive strength Should not be
less than 14 N/mm2

and for Second class Bricks - Should be under 7-14N/mm2

The minimum compressive strength of concrete should not be
less than 3.5N/mm2.

Note : If any brick which has a compressive strength of less
than 3.5N/mm2 should be rejected..!!

Answer / vinod mahawar

105 kg/sq.cm

Answer / krishnakanth jami

(i) Common building bricks—35 kg/sq. cm,
(ii) Second class bricks—70 kg/sq. cm,
(iii) First class bricks— 105 kg/sq. cm.
(iv) Crushing strength of bricks not less than 140 kg/sq. cm are graded as AA class.

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