Answer / sk.sohel

M25 means that 25N/mm2 compressive strength in a 150mm cube
after 28 days of curing.

Answer / jatin chauhan

M25 means that characteristic compressive strength in 15cm
x 15cm x 15cm - cube casting and after 28 days curing
25N/sqmm strength found

Answer / k.renganathan

M refers Mix and 25 refers the characteristic compressive strength of concrete cube of 150mm X150mm X150mm tested at the end of 28 days should be minimum 25 N/Sq.mm.

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