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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 the 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.

## 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.

## 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/mm2 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

## 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.

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 the compressive strength of concrete in Mpa, where M stands for mix and the MPa denotes the overall strength

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 the compressive strength of concrete in Mpa, where M stands for mix and the MPa denotes the overall strength

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 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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