Answer Posted / emdadul haque
(1) In the designation of concrete mix M refers mix
Proportion. like mix of M20 is(1:1.5:3)
The number(20) to the specified characteristic
compressive strength of 150mm cube at 28 days in N/mm^2.
(2) Fe is the chemical symbol for the element IRON, the
major component of steel.
415= characteristic strength of steel.
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