**Different types of concrete grade and their ratio**

### ◆ **types of concrete grade and their uses**

◆ **introduction**:- in this topic know about types of concrete grade and their ratio .we know that concrete each mixture of cement sand and aggregate in fixed proportion and concrete is used for several work in Civil Engineering construction of high rise and low rise building, over bridge, Bridge, dams, retaining walls and different types of piles. Concrete mix is used as PCC plain cement concrete in Roadways Pathwas formation and for flooring of house and also concrete mix is used as RCC for the formation of roof slab, Foundation, footing, beam and column.

**Types of concrete grade and their ratio**

**◆ type of concrete according to their use**

1) PCC (plain cement concrete)

2) RCC (reinforce cement concrete)

1) **PCC** :- it is plain cement concrete which has mixture of cement sand and aggregate which is used for mainly flooring and formation of different types of Pathways. PCC have do not use of Steel bar, concrete without use of Steel bar is used as and known as PCC

2) **RCC** :- it is reinforced cement concrete mixture of cement sand and aggregate with steel bar and used for formation of different types of civil construction works like beam, slab, footing, column , bridge, dams and piles. Concrete mix with steel bar known as RCC

**◆ types of concrete grade according to their mix**

1) nominal mix concrete

2) design mix concrete

1) **nominal mix concrete** :- it is simple type of concrete mix used in domestic and formation of low rise building, M5 M10 m15 M20 and M25 is used in domestic purpose for different type of residential house and formation of bass for foundation. ratio of in this grade of concrete has fixed ratio of sand cement and aggregate. That’s why it is known as nominal mix concrete like mix ratio in M20 grade of concrete is about 1:1.5:3 in which one part is cement 1.5 part is sand and 3 part is aggregate.

**2) design mix concrete**:- it is standard type of concrete mix in which mix ratio of cement sand and aggregate is decided by expert engineer according to require strength of concrete and requirement of concrete strength for high rise building over bridge dams formation of piles.mainly mix ratio is calculated and decided by engineer according to requirement of strength of civil work construction. So grade above m25 like M30 m35 m40 m50 and so on has no fixed mix ratio of concrete that’s why it is called design mix concrete

##### ■** type of concrete grade according to their strength**

1) ordinary concrete grade

2) standard concrete grade

3) high strength concrete grade

**■1) ordinary concrete grade :**– it is simple type of concrete grade mainly used for flooring of surface and formation of flat base for footing and filling , concrete grade like M5 M10 m15 and M20 is ordinary concrete grade, in which M stand for mix and there numerical figure 5 10 15 and 20 stand for comprehensive strength of concrete in 28 days of curing time. M5 M10 and m15 concrete is not used for RCC work it is only used for PCC work and nominal mix concrete M20 is only ordinary concrete grade which is used in both PCC and RCC work construction of low rise building.

◆** 2) standard grade of concrete**:- it is standard grade of concrete used for high rise building construction ,formation of over bridge ,dams ,Bridge and different types of foundation piles, and Railway sleeper. M25 M30 m35 m40 and m45 is known as standard grade of concrete used for RCC work. Only m25 grade of concrete has nominal mix ratio of cement sand and aggregate that is 1:1:2 and above m25 grade of concrete has no fix ratio of cement sand and aggregate it is calculated and decided by export engineer according to requirement of strength of construction work.

**◆3) high strength grade of concrete** :- it has higher strength than ordinary and standard grade of concrete, m50,m55 m60 m70 is high strength grade of concrete, it is commercially used for construction of high rise building according to requirement of strength and their strength and mix ratio of cement sand and aggregate is also calculated and decided by expert engineer.

Types of concrete grade and their ratio

◆ **different mix ratio of concrete**

1) **M5**:- it is ordinary grade of concrete basically it is not used for structural work and nominal mix ratio of cement sand and aggregate in M5 grade of concrete is about 1:5:10. In which one part is cement 5 Part is sand and 10 part is aggregate. And comprehensive strength of M5 grade of concrete is 5 mega pascal which gain in 28 days of curing time

2) **M10**:- it is ordinary grade of concrete and also not used for structural work it is mainly used for flooring and Flat base surface for footing and it has nominal mix ratio of cement sand and aggregate is about 1:4:8 in which one part is cement for part is sand and it part is aggregate,And comprehensive strength of M10 grade of concrete is 10 mega pascal which gain in 28 days of curing time

3) **M15**:- it is also ordinary grade of concrete used for PCC work and flooring of surface not used for RCC work, nominal mix ratio in m15 grade of concrete is about 1:2:4 in which one part is cement 2 part is sand and 4 part is aggregate.And comprehensive strength of M15 grade of concrete is 15 mega pascal which gain in in 28 days of curing time

4) **M20**:- it is only ordinary grade of concrete which is used in RCC work for domestic uses for construction of low rise building and it has nominal mix ratio of cement sand and aggregate is about 1:1.5:3 in which one part is cement is 1.5 part is sand and 3 part is aggregate. M20 grade of concrete used for structural work for footing beam column and slab.And comprehensive strength of M20 grade of concrete is 20 mega pascal which gain in in 28 days of curing time

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5) **M25** :- it is Standard grade of concrete mainly used for RCC work in domestic uses for the construction of beam slab footing and column , and nominal mix ratio of cement sand and aggregate in m25 is 1:1:2 in which one part is cement 1 part is sand and 2 part is aggregate.And comprehensive strength of M25 grade of concrete is 25 mega pascal which gain in in 28 days of curing time