Standard Concrete Mix Ratios
Concrete at the very least contains 3 materials Cement, Sand and Crushed Stones. The ratio in which you add these determines how strong or weak concrete will be. If you are using concrete for not so demanding projects you may mix concrete in already known commonly used ratios. Below is a table listing all the Normal and Standard Mix Ratios. M means Mix and the number next to it means its Compressive strength in Mega Pascal(N/mm2). So M20 means Mix of concrete that has a strength of 20MPa.
| Concrete Grade | Mix Ratio | Compressive Strength MPa(N/mm2) |
| M5 | 1 : 5 : 10 | 5MPa |
| M7.5 | 1 : 4 : 8 | 7.5MPa |
| M10 | 1 : 3 : 6 | 10MPa |
| M15 | 1 : 2 : 4 | 15MPa |
| M20 | 1 : 1.5 : 3 | 20MPa |
| M25 | 1 : 1 : 2 | 25MPa |
Now you must be asking where’s the ratio for M30 and above. The simple answer is there is none. For concrete M30 and above you have to go to Concrete Lab and do some calculations and create concrete mix ratios yourself. These ratios that you designed yourself are known as Design Mixes. And the whole process is known as Concrete Mix Design.Before we move forward I am going to give you a free tool with which you can create Concrete Mix Designs without doing any calculations just enter your requirements and it will do the calculations for you and it will also generate human readable calculations within seconds
Concrete Mix Design App on Google Play: Click here to download
If you are a fresher Civil engineer looking for Job I highly recommend you read this article: How to get a construction job as a fresher civil engineer
Read this article to learn how to design Concrete Mix:Concrete Mix Design – M30 Grade of Concrete