Ready mixed concrete in Leicester from Maxi Readymix

All about different Grades of Concrete …

For producing concrete, materials like cement, sand, aggregates, and water, are mixed in a certain ratio. The cast concrete is then put in a 150mm sized cube to be transferred to a water bath for 28 days. It is afterwards tested in a compression testing machine. The result, expressed in “N/mm^2”, is referred to as the grade of concrete. It is usually defined by the concrete mix proportion and the minimum strength of the concrete at the end of the curing period.

The concrete grade is usually written in Mpa, with M representing the mix and Pa representing the overall strength. For example, in an M30 concrete grade, the ‘M’ indicates the ratio of materials while ‘20’ represents the compressive strength of concrete after 28 days of curing and testing in N/mm^2.

Grades of Concrete …

The grades of concrete can be classified into four main categories, they are:

  • Lean concrete
  • Ordinary grade of concrete
  • The standard grade of concrete
  • High strength concrete grade

Lean Concrete: This is a kind of mix where the volume of cement is lower than the volume of liquid present. Common examples are the M5 and M7.5 grades.

  • M5 grade: The mix ratio for this grade of cement is 1:5:10  i.e if there’s one portion of cement, there’s 5 sand and ten aggregate. This grade is used to provide a uniform surface to the foundation concrete and to prevent the direct contact of the concrete from the soil.
  • M7.5 grade: It is also used to provide a uniform surface for the foundation concrete and prevent direct contact from the soil. The mix ratio of the cement grade is 1:4:8

Ordinary Grade of Concrete: This consists of grades M10, M15, and M20.

  • M10 grade: This is used as a Plain Cement Concrete (PPC) for the construction of levelling courses, concrete roads, beddings for footings, and so on. The mix is in the ratio 1:3:6 of cement, sand, and aggregates.
  • M15 grade: This is also a Plain Cement Concrete (PCC). Like the M10 Grade, it is also used for the construction of levelling courses, beddings of footings, concrete roads, and so on. Its mix ratio is 1:2:4 of cement, sand, and aggregates
  • M20 grade: This is used as a Reinforced Cement Concrete (RCC). It can be used for the construction of slabs, columns, footings, beams, and so on for mild exposure. Its usual mix ratio is 1:1.5:3 of cement, sand, and aggregates.

Standard Grade of Concrete:

  • M25 grade: This is also used as a Reinforced Cement Concrete (RCC). It has a mix ratio of 1:1:2 of cement, sand, and aggregates. Its application includes areas of construction of slabs, columns, footings, and so on.
  • M30 grade: It is used as a Reinforced Cement Concrete (RCC) for the construction of slabs, beams, footings, and so on. Its mix ratio or stipulation for proportioning can be found in the mix design for M30 grade as per IS-10262-2009.
  • M35 grade: This concrete grade is used as Reinforced Cement Concrete (RCC). It is also used for the construction of slabs, beams, footings, columns, and so on. Its mix ratio is according to the mix design for M35 as per IS-10262-2009
  • M40 grade: This is used as a Reinforced Cement Concrete (RCC). Its areas of application include slabs, beams, columns, footings, pre-stressed concrete, and so on. Its mix ratio is according to the mix design for M40 as per IS-10262-2009
  • M45 grade: This is used as a Reinforced Cement Concrete (RCC). Its areas of application include RCC columns, pressurized beams, Concrete roads (PQC), pressurized concrete grinders, and runways. Its mix ratio is done according to the mix design for M45 as per IS-10262-2009
  • M50 grade: This is also used as an RRC. It can be used for the construction of runways, RCC columns, Pressurized concrete grinders, concrete roads, and pressurized beams. Its mix ratio is M-50 Mix Design as per IS-10262-2009
  • M55 grade: This grade of concrete, used as RRC, can be applied to the construction of pressurized concrete grinders, and piers.

High Strength Concrete Grades:

The grades that are classified as high strength are grades 60 and 80. They are used as Reinforced Cement Concrete (RRC) and some of their areas of application include;

  • Construction in aggressive environments.
  • Construction of high rise buildings, long-span bridges, ultra-thin white topping, and so on.
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Conclusions …

It is worthy of note that the type of construction you’re interested in will determine the concrete grade to use, and it is advised to do adequate research before making any decision.

To find out what grade of concrete you need contact us today.