### Mix design of concrete: Mix design M 40

Jan 28, 2012· For 20 mm maximum size aggregate, sand confirming to grading Zone II, water content per cubic metre of concrete = 180 kg and sand content as percentage of total aggregate by absolute volume = 25 per cent.

### ratio of cement m30 grade concrete

Following is a simple method used by engineers to calculate cement, sand and aggregate to produce different grade of concrete like M5, M7.5, M10, M15 and M20. if you don''t want to learn the math involved in the design, you can use the table given at the end of the article to produce different grade of concrete.