What are Different types of Concrete Mix Grades, their strength & their Uses
In concrete mix grades “M” presents concrete mix design ratio and the number after “M” presents MPa or N/mm2 compressive strength of concrete. For example M10, M15, M20, M25 concrete mix grades.
There are different types of concrete mix grades in civil engineering according to their need and use.
Some of them are standard and pre designed & calculated but sometimes in special occasion need based concrete mix designs are used. There uses are depended upon their strength.
According to nature of project we go for a ready mix concrete and sometimes we mix on site.
5N/mm2 means that one mm2 area of concrete cube of 150mm can resist 5N or 5MPa compressive load after curing the 28 days. It can be converted into PSi (by multiplying with 145).
IMPORTANT! C10, C15, C20, C25 etc are British/European standard of “Concrete strength class”.
Where C refers class and numerical values next to “C” represents the compressive strength of Cylinder of (150mm × 300mm) after curing 28 days.
Cylinder Compressive Strength = 0.80 Times of Cube Compressive Strength.
Below the chart is given, there’s the concrete mix grades, their strength and their uses are mentioned.
Concrete mix ratio table:
|Concrete Grade||Mix Ratio (C:S:A)||Compressive Strength (MPa)|
|M30||Design Mix||30||4350||Standard Concrete|
|M60||/||60||8700||High Strength Concrete|
M5 Concrete mix:
M5 (1:5:10) is lean concrete mix which can bear 5 newton load/pressure on per square millimeter area or 725 pounds on per square inch.
M7.5 Concrete Mix:
It is used where there is a little more strength is needed as compare to M5 mix.
M10, M15, M20 M25 mix design:
Concrete mix From M10 (1:3:6) is ordinary concrete. It bear less load than compare to M15. M10 has 10 N/mm2 or 1450 Psi compressive strength. It is use in plinth beams, slabs, R.C.C walls, road pavements etc.
What is M20/M25 concrete mix ratio? M20 concrete mix ratio is (1:1.5:3) respectively. M20 has compressive strength of 20 N/mm2 (MPa) or 2900 Psi. and M25 concrete mix ratio is (1:1:2).
M15 has concrete mix ratio (1:2:4) and it is most commonly use concrete mix because of its compressive strength and economical conditions in ordinary concrete mix section.
It has 15 Newton compressive strength per square millimeter or 2175 Pounds per square inch. M15 concrete is use in Building columns, beams, slab, for plinth beam, bridge piers, pavements almost everywhere generally.
M30, M40, M50 mix design:
M30 to M50 Concrete mix are Standard mix. It is mixed according to designed. That have really high compressive strength.
That are used in Septic tanks, Dams, Barrages, Flyovers, Bridges columns etc. That have as high compressive strength of 4350 psi to 7250 psi.
M60, M70, M80 Concrete mix grade:
M60 to M80 concrete mix are high strength concrete and designed mix. That have 8700 psi to 11603 psi compressive strength. That are used in special occasions.
which concrete grade is used in burj khalifa? In construction of burj khalifa M50 to M80 (high strength) concrete mix grade is used.
Beside compressive strenth high strength concrete mix grade also have resistance against chemical erosion, acid attacks etc.
High strength concrete mix grade is used in chemical labs, nuclear reactors, nuclear weapon ware houses.