Different Grade of Concrete:
The concrete achieve strength after 28 days of construction. it is denoted by “M” to the required strength in MPa. For instance, for a grade of concrete with 15 MPa strength, it will be denoted by M15, where M denotes for Mix.
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There are different proportion for different concrete grades. For example, for M15 concrete, mix proportion will be 1:2:4 for cement: Fine Aggregate: coarse aggregates.
Selection of Concrete Grade for Construction:
concrete grade is selected in construction based on requirement of structural design. There are mainly two types of concrete that is given below:
- Nominal mix
- Design mix.
Nominal mix concrete:
This type of mix concrete is usually used for small scale construction and small structures such as small residential buildings where amount of concrete is not used at high quantity.
Design mix concrete:
This type of mix concrete is get from different lab tests. In selection of material, mixing, transportation and placement of concrete it needs good quality control. Design mix concrete provide mix proportions based on available material and design mix concrete also provide economy in construction if large scale concrete construction is used
Hence heavy projects where concrete is use in large number of quantity they use design mix concrete.
Therefore, acceptable grade of concrete can be selected based on requirements of structure. Nominal mixes for grades of concrete such as M15, M20, M25 are mostly used for small project in construction.
Heavy project structures needed high strength, therefore they go for higher grades of concrete that is M30 and above. The mix ratio of these concretes are based on mix design.
Grades of Concrete:
Conventional grades of concrete are M15, M20, M25 etc. in PCC Plain Cement Concrete construction mostly M15grade of concrete is used. In RCC reinforced cement concrete construction minimum M20 grade of concrete are used.
S.No | Concrete Grade | Mix Ratio | Compressive Strength | |
MPa (N/mm^{2}) | psi | |||
Normal Grade of Concrete | ||||
1 | M5 | 1:05:10 | 5 MPa | 725 psi |
2 | M7.5 | 1:04:08 | 7.5 MPa | 1087 psi |
3 | M10 | 1:03:06 | 10 MPa | 1450 psi |
4 | M15 | 1:02:04 | 15 MPa | 2175 psi |
5 | M20 | 01:05.5 | 20 MPa | 2900 psi |
Table of Normal Grade of concrete
S.No | Concrete Grade | Mix Ratio | Compressive Strength | |
MPa (N/mm^{2}) | psi | |||
Standard Grade of Concrete | ||||
1 | M25 | 1:01:02 | 25 MPa | 3625 psi |
2 | M30 | Design Mix | 30 MPa | 4350 psi |
3 | M35 | Design Mix | 35 MPa | 5075 psi |
4 | M40 | Design Mix | 40 MPa | 5800 psi |
5 | M45 | Design Mix | 45 MPa | 6525 psi |
Table of Standard Grade of Concrete
S.No | Concrete Grade | Mix Ratio | Compressive Strength | |
MPa (N/mm^{2}) | psi | |||
High Strength Concrete Grades | ||||
1 | M50 | Design Mix | 50 MPa | 7250 psi |
2 | M55 | Design Mix | 55 MPa | 7975 psi |
3 | M60 | Design Mix | 60 MPa | 8700 psi |
4 | M65 | Design Mix | 65 MPa | 9425 psi |
5 | M70 | Design Mix | 70 MPa | 10150 psi |
Table of High strength concrete Grade
Uses of Grade of Concrete in Different Type of Construction:
There are different Grades of concrete used in different type of construction. It is classified in four categories that is given below:
- Lean concrete
- Ordinary grade of concrete
- Standard grade of concrete
- High strength concrete grades
LEAN CONCRETE:
Lean concrete has low strength usually used for mass concreting where strength is not needed It is a mix proportion of material where the quantity of liquid in strata is more than the quantity of cement
- M5
- 5
M5 GRADE:
M 5 Grade of concrete is the Mix ratio 1:5:10 materials “1” is Cement, “5” fine aggregate and “10” is coarse Aggregate) Where M denoted by Mix ratio & 5 denotes compressive strength of a 150 mm cube after 28 days of curing, indicates in N / mm^{2}
Use of M5 Grade of Concrete:
- M 5 grade of concrete is used to give the plane surface to the footing or foundation
- It is also used to stop the direct touch of footing or foundation concrete from the soil.
M 7.5 GRADE:
M 7.5 Grade of concrete is the Mix ratio 1:4:8 materials “1” is Cement, “4” fine aggregate and “8” is coarse Aggregate) Where M denoted by Mix ratio & 7.5 denotes compressive strength of a 150 mm cube after 28 days of curing, indicates in N / mm^{2}.
Use of M 7.5 Grade of Concrete:
- M 7.5 grade of concrete is used to give the plane surface to the footing or foundation
- It is also used to stop the direct touch of footing or foundation concrete from the soil.
ORDINARY GRADE OF CONCRETE:
There are three types of ordinary grade of concrete that is given below:
- M10
- M15
- M20
M 10 GRADE:
M 10 Grade of concrete is the Mix ratio 1:3:6 materials “1” is Cement, “3” fine aggregate and “6” is coarse Aggregate) Where M denoted by Mix ratio & 10 denotes compressive strength of a 150 mm cube after 28 days of curing, indicates in N / mm^{2}.
M10 Grade of concrete is used as PCC (Plain Cement Concrete)
Use of M 10 Grade of Concrete:
- M10 Grade of concrete is used in Levelling course.
- It is used in construction of bedding for footing.
- M10 Grade of concrete is used in construction of concrete roads.
M15 Grade:
M 15 Grade of concrete is the Mix ratio 1:2:4 materials “1” is Cement, “2” fine aggregate and “4” is coarse Aggregate) Where M denoted by Mix ratio & 15 denotes compressive strength of a 150 mm cube after 28 days of curing, indicates in N / mm^{2}.
Use of M 15 Grade of Concrete:
- This grade of concrete is used in Levelling of course.
- It is used in plain cement concrete (PCC)
- It is used in construction of bedding for foundation.
- M15 Grade is used in concrete road construction.
M20 Grade:
M 20 Grade of concrete is the Mix ratio 1: 1.5: 3 materials “1” is Cement, “1.5” fine aggregate and “3” is coarse Aggregate) Where M denoted by Mix ratio & 20 denotes compressive strength of a 150 mm cube after 28 days of curing, indicates in N / mm^{2}.
M20 Grade of concrete used as RCC (Reinforced Cement Concrete)
Use of M20 Grade of Concrete:
- M20 grade is used in construction of Slabs, beams, columns, foundation.
- It is used in RCC construction
STANDARD GRADE OF CONCRETE:
There are few types of standard grade of concrete that is given below:
- M25
- M30
- M35
- M40
- M50
- M55
M25 GRADE:
M 25 Grade of concrete is the Mix ratio 1: 1: 2 materials “1” is Cement, “1” fine aggregate and “2” is coarse Aggregate) Where M denoted by Mix ratio & 25 denotes compressive strength of a 150 mm cube after 28 days of curing, indicates in N / mm^{2}.
M25 Grade of concrete used as RCC (Reinforced Cement Concrete)
Use of M 25 Grade of Concrete:
- M25 grade of concrete is used in construction of Slabs, beams, columns, footings.
- It is used in RCC construction.
M30 Grade:
M 30 Grade of concrete is prepared by design Mix.Mix Design of M30 grade of concrete is as per IS- 10262-2009
In M30 grade of concrete “M” denoted by Mix ratio & 30 denotes compressive strength of a 150 mm cube after 28 days of curing, indicates in N / mm^{2}.
Use of M 30 Grade of Concrete:
- M30 grade of concrete is used in construction of Slabs, beams, columns, footings.
- It is used in RCC construction.
M35 GRADE:
M 35 Grade of concrete is prepared by design Mix. Mix Design of M30 grade of concrete is as per IS- 10262-2009
In M35 grade of concrete “M” denoted by Mix ratio & 35 denotes compressive strength of a 150 mm cube after 28 days of curing, indicates in N / mm^{2}.
Use of M 35 Grade of Concrete:
- M35 grade of concrete is used in construction of Slabs, beams, columns, footings.
- It is used in RCC construction.
M40 Grade:
M 40 Grade of concrete is prepared by design Mix. Mix Design of M40 grade of concrete is as per IS- 10262-2009
In M40 grade of concrete “M” denoted by Mix ratio & 40 denotes compressive strength of a 150 mm cube after 28 days of curing, indicates in N / mm^{2}.
Use of M 40 Grade of Concrete:
- M40 grade of concrete is used in Pre-stressed concrete
- It is used in RCC slabs, beams, columns, footings, etc.
M45 Grade:
M 45 Grade of concrete is prepared by design Mix. Mix Design of M45 grade of concrete is as per IS- 10262-2009
In M45 grade of concrete “M” denoted by Mix ratio & 45 denotes compressive strength of a 150 mm cube after 28 days of curing, indicates in N / mm^{2}.
Use of M 45 Grade of Concrete:
- This grade of concrete is used in Runways, Concrete Roads,
- It is also used in Pressurized Concrete Girders, RCC Columns, Pressurized beams.
Grade M50:
M 50 Grade of concrete is prepared by design Mix. Mix Design of M50 grade of concrete is as per IS- 10262-2009
In M50 grade of concrete “M” denoted by Mix ratio & 50 denotes compressive strength of a 150 mm cube after 28 days of curing, indicates in N / mm^{2}.
Use of M 50 Grade of Concrete:
- M50 grade of concrete is used in RCC construction.
- It is used in Runways, Concrete Roads,
- M50 grade of concrete is also used in Pressurized Concrete Girders, RCC Columns, Pressurized beams.
Grade M55:
M 55 Grade of concrete is prepared by design Mix. Mix Design of M55 grade of concrete is as per IS- 10262-2009
In M55 grade of concrete “M” denoted by Mix ratio & 55 denotes compressive strength of a 150 mm cube after 28 days of curing, indicates in N / mm^{2}.
Use of M 55 Grade of Concrete:
M55 grade of concrete is used in RCC construction.
It is used in Pressurized Concrete Girders and Pier
High Strength Concrete Grades:
There are two types of high strength concrete that is given below:
- M60
- M80
M60 Grade:
M 60 Grade of concrete is prepared by design Mix. Mix Design of M60 grade of concrete is as per IS- 10262-2009
In M60 grade of concrete “M” denoted by Mix ratio & 60 denotes compressive strength of a 150 mm cube after 28 days of curing, indicates in N / mm^{2}.
Use of M60 Grade of Concrete:
- M60 grade of concrete is used in reinforced cement concrete (RCC) construction where high compressive strength is needed like high rise buildings, bridges having long distance etc.
- It is used in critical environment construction.
- M60 grade of concrete is used in Spillways of dams.
M80 Grade:
M 80 Grade of concrete is prepared by design Mix. Mix Design of M80 grade of concrete is as per IS- 10262-2009
In M80 grade of concrete “M” denoted by Mix ratio & 80 denotes compressive strength of a 150 mm cube after 28 days of curing, indicates in N / mm^{2}.
Use of M80 Grade of Concrete:
- M80 grade of concrete is used in reinforced cement concrete (RCC) construction where high compressive strength is needed like high rise buildings, bridges having long distance etc.
- It is used as RCC (Reinforced Cement Concrete)
- It is used in critical environment construction.
- M80 grade of concrete is used in Spillways of dams.
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