# Concrete mix ratios

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We all know that on mixing cement with sand, stone/aggregates and water, a paste will form which can be used to bind the building materials together. This paste is also called as concrete. The strength of this concrete mix is determined by the proportion on which these cement, sand, stones or aggregates are mixed. There are various grades of concrete available in the market based on these ratios.

**Concrete mix ratios**** **Some of them are M10, M20, M30, M35, etc. So, what really does M10 or M20 mean or represent.

“M” stands for “mix”. The mix represents concrete with designated proportions of cement, sand, and aggregate. And the number following “M” represents the compressive strength of that concrete mix in N/mm2 after 28 days. For example, for the M20 grade of concrete mix, its compressive strength after 28 days should be 20 N/mm2.