Answer / sjtbehera

what is the meaning of the question. basically m 40 are
desigin in weigh basis i.e desigin mix.

desigin of m25 is separate from m40 desgin. that is not a
conversion method. if you make m40 you add aditional weight
of material with m25 material.

Answer / guddu kumar singh

By quality controlling
and use modern mixing
method

Answer / t.madhu sudhan

By trial n error method at lab with respect to available cement, course aggregate and fine aggregate, we achieve required strength of a cube, is known as mix design, where as nominal design is taken upto M20 grade concrete to a total 1 M3, to a total quantity of about 1.51 M3 divided by their mixed proportion s

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