First I would like to share some information about Old provision for the Grade of Concrete that is Mentioned in Table-2 of IS 456-2000. In this article, you will find some differences between the old provision of IS 456-2000 and Amendment 4 of IS 456-2000.

### Grade of Concrete As per IS 456-2000 (Older Version )

According to the Table-2 of IS 456-2000, the Grade of concrete is classified into three categories i.e. Ordinary Concrete, Standard Concrete, and High Strength Concrete. There are three Grades such as M 10, M 15, M 20 comes under Ordinary Concrete and its respective Specified characteristics compressive strength of 150 mm cube at 28 days are 10 N/mm2, 15 N/mm2, and 20 N/mm^{2}. The Grade Designation of M 10 Stands such that M stands for Mix and 10 stands for Specified characteristics compressive strength of 150 mm cube at 28 days is 10 N/mm^{2}.

The Second Category is Standard Concrete. In Standard Concrete includes the Grade Designation such as M 25, M 30, M 35, M 40, M 45, M 50, and M 55 and it corresponding compressive strength are 25 N/mm^{2}, 30 N/mm^{2}, 35 N/mm^{2}, 40 N/mm^{2}, 45 N/mm^{2}, 50 N/mm^{2}, and 55 N/ mm^{2}.

The Third Category is High Strength Concrete. Grade Designation such as M 60, M 65, M 70, M 75, M 80 Comes under the High Strength Grade of Concrete. There are 5 Concrete Grade falls in High strength concrete.

Note: For Concrete of compressive strength greater than M 55, the design parameter given in this standard may not be applicable and the values may be obtained from specialized literature and experimental results.

So, all the design Parameter Mentioned in IS 456-2000 is applicable for the Grade of concrete less than M 55 and above M 55 grade of concrete, this standard is not applicable.

**Modification As per IS 456-2000 Amendment -04**

In the 4^{th} Revision of IS 456-2000 i.e. Amendment-4 modified the Grade of concrete. This modification happened in May 2013. As per this Amendment, the Grade of concrete is classified into three groups i.e. Ordinary Concrete, Standard Concrete, and High Strength Concrete. In Ordinary Concrete, there are Grades such as M 10, M 15, M 20.

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There are some modification in Standard Concrete Grade i.e. Number of Grades comes under Standard concrete are M 25, M 30, M 35, M 40, M 45, M 50, M 55, and M 60. High Strength concrete includes the Grade Designation such as M 65, M 70, M 75, M 80, M 85, M 90, M 95, and M 100.

Note: For the Concrete Grade above M 60, design parameters given in the standard may not be applicable and the values may obtain from the specified literature and experimental results.

Read Also:-M15 Grade of Concrete Prepared At Construction Site

**Major Difference Observed for a grade of concrete as per IS 456-2000 (Older version) and IS 456-2000 Amendment-04.**

S. No | IS 456-2000 (Old version) | IS 456-2000, Amendment- 04. |

1. | There are total 15 Grade of Concrete Available. | There are total 19 Grade of Concrete Available. |

2. | M 60 Grade of concrete Comes Under the Category of High Standard Concrete. | M 60 Grade of concrete Comes Under the Category of Standard Concrete. |

3. | There are 7 Grades that come under Standard Concrete. i.e. M 25, M 30, M 35, M 40, M 45, M 50, and M 55. | There are 8 Grades that come under Standard Concrete i.e. M 25, M 30, M 35, M 40, M 45, M 50, M 55 and M 60. |

4. | There is 5 Concrete Grade come under the category of High strength concrete. i.e. M 60, M 65, M 70, M 75, M 80 | 4 New ConcreteGrade is added in High Strength Concrete i.e. M 85, M 90, M 95, and M 100. |

5. | For the ConcreteGrade above M 55, design parameters given in the standard may not be applicable and the values may obtain from the specified literature and experimental results. | For the Concrete Grade above M 60, design parameters given in the standard may not be applicable and the values may obtain from the specified literature and experimental results. |

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