Answer Posted / sundarapandiyan

bricks class 1=7.5 n/sqmm,
class 2= 4.5 n/sqmm,
class 3=3.0n/sqmm.
solid and hollow blocks, grade A= 3.5-7 n/sqmm.
grade B= 2-5 n/sqmm,
grade C=1.5 n/sqmm,
grade D=4-5 n/sqmm.

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