What Is Concrete Mix Ratio?
A properly designed mixture possesses the desired workability for the fresh concrete and the required durability and strength for the hardened concrete. Typically, a mix is about 10 to 15 % cement, 60 to 75 % aggregate and 15 to 20 % water. This concrete mix ratio of aggregate to sand to cement is an important factor in determining the compressive strength of the concrete mixture.
Type of Concrete Mix Ratio.
As Per IS Code 456-2000 three different part of Concrete Mix Ratio
1- Nominal Concrete Mix Ratios
Concrete Grade | Mix Ratio | Compressive Strength | |
| MPa (N/mm2) | psi | ||
| Normal Grade of Concrete | |||
| M5 | 1 : 5: 10 | 5 MPa | 725 psi |
| M7.5 | 1: 4: 8 | 7.5 MPa | 1087 psi |
| M10 | 1 : 3: 6 | 10 MPa | 1450 psi |
| M15 | 1 : 2: 4 | 15 MPa | 2175 psi |
| M20 | 1: 1.5 : 3 | 20 MPa | 2900 psi |
2- Standard Mixes Ratio
Concrete Grade | Mix Ratio | Compressive Strength | |
| MPa (N/mm2) | psi | ||
| Standard Grade of Concrete | |||
| M25 | 1: 1: 2 | 25 MPa | 3625 psi |
| M30 | Design Mix | 30 MPa | 4350 psi |
| M35 | Design Mix | 35 MPa | 5075 psi |
| M40 | Design Mix | 40 MPa | 5800 psi |
| M45 | Design Mix | 45 MPa | 6525 psi |
3- High Strength Concrete Mix Ratio
Concrete Grade | Mix Ratio | Compressive Strength | |
| MPa (N/mm2) | psi | ||
| High Strength Concrete Grades | |||
| M50 | Design Mix | 50 MPa | 7250 psi |
| M55 | Design Mix | 55 MPa | 7975 psi |
| M60 | Design Mix | 60 MPa | 8700 psi |
| M65 | Design Mix | 65 MPa | 9425 psi |
| M70 | Design Mix | 70 MPa | 10150 psi |
Click Here To See Different Grades Of Concrete And Their Applications
Slump value of Concrete
The concrete slump test measures the consistency of fresh concrete before it sets. It is performed to check the workability of freshly made concrete, and therefore the ease with which concrete flows. It can also be used as an indicator of an improperly mixed batch. The test is popular due to the simplicity of the apparatus used and simple procedure. The slump test is used to ensure uniformity for different loads of concrete under field conditions.
| Concrete Mixes | Slump range in mm |
| Columns, Retaining Walls | 75-150mm |
| Beams & Slabs | 50-100mm |
| CC Pavements | 20-30mm |
| Decks of bridge | 30-75mm |
| Vibrated Concrete | 12-25mm |
| Huge Mass Constructions | 25-50mm |
Click Here To See Concrete Slump Test Definition, Procedure And Types Of Slump Test
