CONCRETE GRADES
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.
M 7.5 Grade Concrete
- Mix ratio: 1:4:8.
- Compressive strength: 7.5 Mpa, 1087psi.
- Uses: M7.5 concrete strength is used, to prevent footings or foundations from touching the soil and to create a level surface to the footing or foundation.
M10 Garde Concrete
Mix ratio: 1:3:6.
Compressive strength: 10 Mpa concrete mix, 1450psi.
Uses: M10 concrete strength is suitable for commercial and domestic projects. M10 concrete uses include:
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• Floors.
• Garden walls.
• Non-load-bearing walls.
• Drainage works.
• Foundations for steps.
• Trench filling.
• Bedding for footings.
M15 Grade Concrete
Mix ratio: 1:2:4.
Compressive Strength: 15 Mpa, 2175 psi.
Uses: Grade M15 concrete is used for both domestic and commercial projects such as patio slabs, paths and other non-structural work. Pavement kerbs & floor binding.
M 20 Grade Concrete
Mix design ratio: 1:1.5:3 ratio.
Compressive strength: 20 Mpa, 2900 psi.
Uses: M20 grade concrete is used for domestic purposes such as floors and foundations if the structure weight is light.
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• Uses: M20 grade concrete is used for domestic purposes such as floors and foundations if the structure weight is light. This strength of concrete is also suitable for internal floor slabs, garages, driveways and workshop bases. C20 concrete is typically used for:
• Patio paving.
• Shed bases.
• House extensions.
• Internal flooring.
• Garages.
• Foundations.
• Walls.
• Light agricultural slabs.
M 25 Grade Concrete
Mix ratio: 1:1:2.
Compressive strength: 25 Mpa, 3625 psi.
Uses: M25 grade of concrete is used in Reinforced Cement Concrete (RCC) for constructing footings, columns, beams and slabs. Construction in all areas. Multi-purpose concrete mix, usually used for foundations.
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M25 concrete strength is typically used for small-scale construction or small residential buildings. C25 concrete is typically used for:
- Footings.
- Foundations.
- Groundwork.
- Flooring.
- Kerbing.
- Roadworks.
- Land fill.
- Trench fill.
M 30 Grade Concrete
Mix ratio: design mix.
Compressive strength: 20 Mpa, 4350 psi.
Uses: 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.
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M30 concrete is also used in RCC construction for slabs, beams, footings and columns for structures that are slightly heavier.
- Paving.
- Reinforced concrete construction foundations.
- External parking.
- Hard standing areas.
- Access roads for vehicles.
- Driveways.
M 35 Grade Concrete
Mix ratio: design mix.
Compressive strength: 35 Mpa, 5075 psi.
Uses: M35 concrete strength is a heavy grade mix used in RCC construction that is typically used for external structures such as walls, slabs and structural piling. C35 concrete is typically used for:
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- Light storage areas.
- External slabs.
- Loading bays.
- External paving.
- Industrial driveways.
- Heavy duty garages.
- Heavy duty paving.
M40 Grade Concrete
Mix ratio: design mix.
Compressive strength: 40 Mpa, 5800 psi.
Uses: M40 is used in commercial construction sites to create foundations and beams to provide structural support and roads. It withstands chemical corrosion so can also be used as pre-stressed concrete, beams, footings, slabs,
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pressurized concrete girders, RCC columns and pressurized beams. Farms also use M40 concrete for structures where slurry could corrode structures or in septic tanks. C40 concrete is typically used for:
- Iron works.
- Roadworks.
- Foundations.
- Support beams.
- Harsh environments.
- Septic tanks.
- Slurry pits.
- Agricultural yards.
- Piling.
M 45 Grade Concrete
Mix ratio: design mix.
Compressive strength: 45 Mpa, 6525 psi.
Uses: M45 grade of concrete is used in runways and concrete roads. It can also be used for pressurized beams, RCC columns and pressurized concrete grinders. C45 concrete is typically used for:
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- Roadworks.
- Foundations.
- Piling.
- Slurry pits.
- Aggressive ground.
- Silage pits.
- HGV parks.
- Stable flooring.
- Harsh environments.
M50 Grade Concrete
Mix ratio: design mix.
Compressive strength: 50 Mpa concrete mix ratio, 7250 psi.
Uses: High strength concrete grades are used for large scale concrete construction. M50 concrete is used for RCC columns, runways, concrete roads and pressurized beams. C50 concrete is typically used for:
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- Roadworks.
- Aggressive ground.
- Silage pits.
- Slurry pits.
- HGV parks.
- Foundations.
- Stable flooring.
- Piling.
- Harsh environments.
M 55 Grade Concrete
Mix ratio: design mix.
Compressive strength: 55 Mpa, 7975 psi.
Uses: M55 concrete is used in the construction of piers and pressurized concrete grinders.
M 60 Grade Concrete
Mix ratio: design mix.
Compressive strength: 60 Mpa, 8700 psi.
Uses: grades of concrete that are M60+ are used in environments where high compressive strength is required such as long bridges or high rising buildings. It is also used in spillways or dams and critical environment construction projects.
M 65 Grade Concrete
Mix ratio: design mix.
Compressive strength: 65 Mpa, 9425 psi.
Uses: M65 concrete is used for RCC work when high compressive strength is required for construction projects such as long span bridges, high rise buildings, coastal construction work, spillways of dams and thin white toppings.
M70 Grade Concrete
Mix ratio: design mix.
Compressive strength: 50 Mpa concrete mix ratio, 7250 psi.
Uses: M70 concrete is also used for RCC work when high compressive strength is required for construction projects such as long span bridges, high rise buildings, coastal construction work, spillways of dams and thin white toppings.
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Choosing the right concrete grade and strength is vital to the efficiency of the structure of your construction project. Hopefully, this complete list of different grades of concrete and their uses and concrete grade mix ratio will benefit somebody in construction who may need a reliable reference point
