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Question
Whats the mixing ratio for concrete class 40/20?

Answer
Dear Peter

There is no fixed mixing ratio due to strength of materials and their surface nature. But we can say that for a concrete with 4000 N/cm2 of strength you need at least 450-475 kg of cement. The exact admixture should be tuned after laboratory testing.

Regards
BEH

Civil Engineering

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I can answer questions in Structural Engineering, Earthquake Engineering, Project Management and Project Control topics!

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