29 Mar

Different types of concrete grades and their uses

Whether you are looking for the right domestic or commercial concrete mix for your construction job, or are just curious about the different grades of concrete and would like to know more, read on to get an understanding of these different types of concrete and their uses, or get in contact today by calling us on 01442 389105

Understanding Grades of Concrete

Grades of concrete are defined by the strength and composition of the concrete, and the minimum strength the concrete should have following 28 days of initial construction. The grade of concrete is understood in measurements of MPa, where M stands for mix and the MPa denotes the overall strength.

 

Concrete mixes are defined in ascending numbers of 5, starting at 10, and show the compressive strength of the concrete after 28 days. For instance, C10 has the strength of 10 newtons, C15 has the strength of 15 newtons, C20 has 20 newtons strength and so on.

 

Different mixes (M) come in various mix proportions of the various ingredients of cement, sand and coarse aggregates. For instance, M20 comes in the respective ratio of 1:1:5:3. You can see other examples below in the table.

 

Concrete Grade Mix Ratio (cement : sand : aggregates) Compressive Strength
MPa (N/mm2) psi
Grades 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 Concrete Grades
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

 

Concrete being poured

(image provided by 9images)

Choosing the right concrete grade for the construction job:

So what can these grades be used for and which is best for the job at hand? Below is a list of a few of the initial concrete grades and what they are best used for.

 

C10

Used for: Patio slabs, pathways and non-structural work

Type: Domestic & commercial use

 

C15

Used for: Pavement kerbs and floor blinding

Type: Domestic & Commercial

 

C20

Used for: Domestic floors and foundations (where the weight of structure will be lighter). Also good for workshop bases, garages, driveways and internal floor slabs.

Type: Domestic

 

C25

Used for: Construction in all areas. Multi-purpose concrete mix, usually used for foundations.

Type: Domestic & Commercial

 

C30

Used for: Pathways and roadways (this is the lowest grade concrete mix that can be used for this purpose). More durable than the grades that have come before, and thus is much more weather-resistant and can take heavy road traffic.

Type: Commercial

 

C35

Used for: Commercial structures. This heavy concrete mix is usually used for creating external walls and slabs, as well as for structural piling.

Type: Commercial

 

C40

Used for: Commercial construction sites, creating foundations and beams for structural support and roads. The most durable in this list, C40 can withstand chemical corrosion also, so is frequently used on farms where slurry could corrode structures, or in septic tanks.

Type: Commercial

 

We hope you found this guide useful, and if you are interested in learning more, visit our blog for more information on the concrete types available to you.

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