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## What Is the Grade of Concrete?

**Grades of concrete** are defined by the **concrete mix proportion **and the **minimum **strength of **concrete** at end of** 28 days curing** period.

The** Concrete Grade** is can be known by **calculating **th**e compressive strength of concrete** in** Mpa**, where **M stands for mix** and the **MPa denotes the overall strength**

There are different **types of concrete mix** which are based on **concrete classification **according to its **compressive strength. **

For **making** concrete we use **cement**, sand,** aggregate**, and water which are **mixed **with a certain ratio, and **concrete **is cast and put in a **cube **of 150 mm size and put in a **water **bath for **28 days and afterward**, it is tested in a **compression testing machine**. The compressive stress result is **known **as the “**grade of concrete**“**. It is expressed in N/mm²**

**The concrete grade** is denoted by** M10, M20, M30**, and so on according to their **compressive strength**.

**Read More:** **Concrete Mix Design Step By Step Full Calculation**

**Concrete Grade **As Per Indian Standards

The** “M”** refers to **Mix** and Number after **M (M10, M20)** Indicating the **compressive strength **of concrete after **28 days **of **curing** and **testing**.

**M **indicates the **proportion **of materials like **Cement: Sand: Aggregate (1:2:4) **or **Cement:** **Fine Aggregate: Coarse Aggregate.**

If we mention** M10** concrete, it **means** that the **concrete **has 10 N/mm2 **characteristic** compressive strength at **28 days.**

In the **designation** of **concrete mix M** to the mix and the **number **to the **specified **compressive strength of **150 mm size cube at 28 days**, expressed in** N/mm^2.**

**Read More:** **How To Check Compressive Strength Of Concrete**

**Concrete Grade Per British/European standards**

As per **BS 8500-2 British/European standards,** the grade of **concrete **is denoted as **C10, C15, C20, C25,** etc., **‘C’ **which means ‘**Concrete** **Strength class’, **and the number **behind C** refers to characteristic Compressive strength of Concrete in N/mm2 @ 28 days when **tested **with the **15 cm dia. **& 30 cm **height cylinder **in a direct compression test**.**

The **grade of concrete **is also denoted as **C16/20**, **C20/25**, **C25/30,** etc., which means **Concrete Strength Class (C) **the number behind** C refers** to the Compressive strength of **Concrete **in N/mm^{2} when tested with** Cylinder / Cube.**

**Different mix proportions of the materials used to make concrete namely**

**Cement****Coarse aggregate****Fine aggregate****Water**

**Resulting in concretes with different properties.**

## Concrete Classification

Following are the** Standard Concrete Grade** with their **Mix Proportions and Strength**

Grades of Concrete | Mix Ratio (Cement: Sand: Aggregates) | Compressive StrengthMPa (N/mm2) | psi |

Lower 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 |

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 |

High Strength Grade of Concrete | |||

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 |

**The Selection of the Grade of Concrete Depends on the Situation and Uses**

Concrete Grade (N/mm2) | Ratio Cement, Sand, and Aggregates | Usage |

10 | 1:3:6 | PCC |

15 | 1:2:4 | PCC |

20 | 1:1.5:3 | Normal Construction Concrete |

25 | 1:1:2 | Reinforced concrete/precast |

30 | Concrete Mix Design | Heavy Reinforced concrete/pre-cast |

35 | Concrete Mix Design | Pre-stressed/pre-cast concrete |

40 | Concrete Mix Design | Very heavy reinforced concrete/pre-cast/prestressed |

45 | Concrete Mix Design | Very heavy reinforced concrete/pre-cast/prestressed |

**Watch Video: What is Grade of Concrete and Different Types used in Construction**

## FAQs:

### c16/20 concrete meaning

**In C16/20 concrete grade, **C refers to concrete **strength, 16** number indicates its **characteristics of compressive strength (fck) **on cylinder test that is **16MPa **and numerical figure **20 represents** its characteristics of **compressive strength (fck)** on cube test that is **20MPa.**

### Grade of Concrete

**Grades of concrete** are defined by the concrete mix proportion and the minimum strength of **concrete** at end of 28 days curing period. The** Concrete Grade** is can be known by calculating th**e compressive strength of concrete** in** Mpa**, where **M stands for mix** and the **MPa denotes the overall strength**

### Concrete grade

Concrete Grade is defined by the concrete mix proportion and the minimum strength of **concrete** at end of 28 days curing period. The** Concrete Grade** is can be known by calculating th**e compressive strength of concrete** in** Mpa**, where **M stands for mix** and the **MPa denotes the overall strength**

### concrete grade c25/30 meaning

**In C25/30 concrete grade, **C refers to concrete **strength, 25 number **indicates its **characteristics of compressive strength (fck) **on cylinder test that is **25MPa, **and numerical figure **20 represents** its characteristics of **compressive strength (fck)** on cube test that is **30MPa.**

### concrete grade 30

Concrete** grade 30 **does not have a **standard concrete mix ratio**. To make **M 30 grade of concrete,** we have to prepare a** mix design** for it as per IS Code. In **M 30, **M is for **Mix, **and **30** is the design **compressive strength of concrete,**

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Alia Lopezwow what a explanation… Thanks its really informative❤❤