Table of Contents

## What Is Grade of Concrete

- By the composition and strength of the concrete, the grades of concrete are defining.
- For the initial construction, the minimum strength of concrete should have followed at 28 days.
- The grade of concrete is expressed in the measurement MPa. Where the M is stand for mix and the MPa expressed the overall strength of the concrete.
- As an example for the M20 grade of concrete, Where the M stands for mix and 20 means the maximum compressive strength achieves by the concrete 20N/mm2 at 28 days.
- The size of the cube upon which the compressive strength test is done is 150 X 150 X 150 mm.

## The Different Types Grade of Concrete Is Below

GROUP | DESIGNATION | CHARACTERISTIC COMPRESSIVE STRENGTH Fck AT 28 DAYS |

ORDINARY CONCRETE | M 10 | 10 |

M 15 | 15 | |

M 20 | 20 | |

M 25 | 25 | |

M30 | 30 | |

M35 | 35 | |

STANDARD CONCRETE | M 40 | 40 |

M 45 | 45 | |

M 50 | 50 | |

M 55 | 55 | |

M 60 | 60 | |

M 65 | 65 | |

HIGH STRENGTH CONCRETE | M 70 | 70 |

M 75 | 75 | |

M 80 | 80 |

## Concrete Mix Ratio

The different grade of concrete and with the required grade in the constructions, the concrete mix ratio is different that’s are below-

### Grade of Concrete

- For the M5 grade of concrete the mix ratio (cement: sand: aggregate) is 1: 5: 10 and the compressive strength 5 MPa ( N/mm2 ) or 725 psi.
- For the M7.5 grade of concrete the mix ratio (cement: sand: aggregate) is 1: 4: 8 and the compressive strength 7.5 MPa ( N/mm2 ) or 1087 psi.
- And for the M10 grade of concrete the mix ratio (cement: sand: aggregate) is 1 : 3: 6 and the compressive strength 10 MPa ( N/mm2 ) or 1450 psi.
- For the M15 grade of concrete the mix ratio (cement: sand: aggregate) is 1 : 2: 4 and the compressive strength 15 MPa ( N/mm2 ) or 2175 psi.
- For the M20 grade of concrete the mix ratio (cement: sand: aggregate) is 1: 1.5 : 3 and the compressive strength 20 MPa ( N/mm2 ) or 2900 psi.

### The Standard Grade of Concrete

The Standard grade of concrete is below-

- For the M25 grade of concrete the mix ratio (cement: sand: aggregate) is 1 : 1: 2 and the compressive strength 25 MPa ( N/mm2 ) or 3625 psi.
- For the M30 grade of concrete the mix ratio (cement : sand: aggregate) is the design mix and the compressive strength 30 MPa ( N/mm2 ) or 4350 psi.
- And for the M35 grade of concrete the mix ratio (cement: sand: aggregate) is the design mix and the compressive strength 35 MPa ( N/mm2 ) or 5075 psi.
- For the M40 grade of concrete the mix ratio (cement: sand: aggregate) is the design mix and the compressive strength 40 MPa ( N/mm2 ) or 5800 psi.
- For the M45 grade of concrete the mix ratio (cement : sand: aggregate) is the design mix and the compressive strength 45 MPa ( N/mm2 ) or 6525 psi.

### High Strength Grade of Concrete-

The high strength grade of concrete is below-

- For the M50 grade of concrete the mix ratio (cement: sand: aggregate) is the design mix and the compressive strength 50 MPa ( N/mm2 ) or 7250 psi.
- For the M55 grade of concrete the mix ratio (cement: sand: aggregate) is the design mix and the compressive strength 55 MPa ( N/mm2 ) or 7975 psi.
- And for the M60 grade of concrete the mix ratio (cement: sand: aggregate) is the design mix and the compressive strength 60 MPa ( N/mm2 ) or 8700 psi.
- For the M65 grade of concrete the mix ratio (cement: sand: aggregate) is the design mix and the compressive strength 65 MPa ( N/mm2 ) or 9425 psi.
- For the M70 grade of concrete the mix ratio (cement : sand: aggregate) is the design mix and the compressive strength 70 MPa ( N/mm2 ) or 10150 psi.

Also Read: What Is Lintel? | Function of Lintel | Types of Lintel

## Type of Concrete Mix

Genarally there are two types of concrete mix that’s are below-

### Nominal Mix

In which mix the below-grade of concrete are used that’s that is called nominal mix. The grads are-

- M5 grade and the ratio is 1: 5: 10.
- M7.5 grade and the ratio is 1 : 4: 8.
- M10 grade and the ratio is 1 : 3: 6.
- M15 grade and the ratio is 1 : 2: 4.
- M20 grade and the ratio is 1: 1.5 : 3.

### Design Mix

In which mix M25, M30, M35, M40, M45, M50, M55, M60, M65, and M70 grade of concrete are used that’s is called design mix.

## Different Types of Concrete Grade with Concrete Mix Ratio and Compressive Strength

### Normal Concrete Grade

- For the M5 grade of concrete the mix ratio (cement : sand : aggregate) is 1 : 5 : 10 and the compressive strength 5 MPa ( N/mm2 ) or 725 psi.
- For the M7.5 grade of concrete the mix ratio (cement : sand : aggregate) is 1 : 4 : 8 and the compressive strength 7.5 MPa ( N/mm2 ) or 1087 psi.
- And for the M10 grade of concrete the mix ratio (cement : sand : aggregate) is 1 : 3 : 6 and the compressive strength 10 MPa ( N/mm2 ) or 1450 psi.
- For the M15 grade of concrete the mix ratio (cement : sand : aggregate) is 1 : 2 : 4 and the compressive strength 15 MPa ( N/mm2 ) or 2175 psi.
- For the M20 grade of concrete the mix ratio (cement : sand : aggregate) is 1 : 1.5 : 3 and the compressive strength 20 MPa ( N/mm2 ) or 2900 psi.

### Standard Concrete Grade

- For the M25 grade of concrete the mix ratio (cement : sand : aggregate) is 1 : 1 : 2 and the compressive strength 25 MPa ( N/mm2 ) or 3625 psi.
- For the M30 grade of concrete the mix ratio (cement : sand : aggregate) is design mix and the compressive strength 30 MPa ( N/mm2 ) or 4350 psi.
- And for the M35 grade of concrete the mix ratio (cement : sand : aggregate) is design mix and the compressive strength 35 MPa ( N/mm2 ) or 5075 psi.
- For the M40 grade of concrete the mix ratio (cement : sand : aggregate) is design mix and the compressive strength 40 MPa ( N/mm2 ) or 5800 psi.
- For the M45 grade of concrete the mix ratio (cement : sand : aggregate) is design mix and the compressive strength 45 MPa ( N/mm2 ) or 6525 psi.

### High Strength Concrete Grade

- For the M50 grade of concrete the mix ratio (cement : sand : aggregate) is design mix and the compressive strength 50 MPa ( N/mm2 ) or 7250 psi.
- For the M55 grade of concrete the mix ratio (cement : sand : aggregate) is design mix and the compressive strength 55 MPa ( N/mm2 ) or 7975 psi.
- And for the M60 grade of concrete the mix ratio (cement : sand : aggregate) is design mix and the compressive strength 60 MPa ( N/mm2 ) or 8700 psi.
- For the M65 grade of concrete the mix ratio (cement : sand : aggregate) is design mix and the compressive strength 65 MPa ( N/mm2 ) or 9425 psi.
- For the M70 grade of concrete the mix ratio (cement : sand : aggregate) is design mix and the compressive strength 70 MPa ( N/mm2 ) or 10150 psi.

## Uses of Different Grades of Concrete

The many uses of different grade of concrete is below-

### Normal Grade of Concrete

- In the normal grade of concrete M5, M10, M15 are generally used plain cement concrete (PCC) work for bedding for footing or leveling courses, etc.
- The M20 grade of concrete is used for reinforcement cement concrete (RCC) work such as column, beam, slab, and footing, etc.

### The Standard Grade of Concrete

- The M25, M30, M35 grades are used for reinforcement cement concrete (RCC) as footing columns, slabs, beams, foundations, etc.
- For the pre-stressed concrete work, M4O grade is used for beams, slabs, columns, footing, etc.
- For the pre-stressed concrete girder, runway, concrete roads pre-stressed beams, RCC columns M45, and M50 are used.
- For the piers and pre-stressed concrete girder, the M55 grade of concrete is used.

### High Strength Concrete

- Where the high compressive strength is required such as long-span bridge, high rise building, ultra-thin white topping, coastal construction, spillways of dams, etc. there we used M60, M65, and M70 grade of concrete are used.

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