Grades Of Concrete and their Ratios

Here are different grades of concrete with respect to their ratio of cement, sand (fine aggregate) & stone (coarse aggregate) as per British Specifications.
Grade (MPa) Grade (psi) Cement : Fine Agg : Coarse Agg
M5 725 1:4:8
M10 1450 1:3:6
M15 2175 1:2:4
M20 2900 1:1.5:3
M25 3625 1:1:2
National Highways Authority
ClassStrengthUnitsRatios (MRS)Water Cement Ratioslump (mm)Usage
Class A13000psi1:1:20.5825-75unreinforced/reinforced concrete strucutres
Class A23500psi1:1:20.58100-150under water
Class A34000psi1:1:20.58100-150piles
Class B

2418
(2400)

psi1:1.5:30.6525-75piles only
Class C3000psi1:2:40.5825-75cribbing/general use
Class D14978
(5000)
psi1:1:20.450-100Pre-stressed – post tensioned structures
Class D26045
(6000)
psi1:1:20.450-100Pre-stressed – post tensioned structures
Class D3

7112
(7000)

psi1:1:20.450-100Pre-stressed – post tensioned structures
Class Y

2575
(2600)

psi1:1.5:30.5850-100filler in steel grid, bridge floor
Lean Concrete

1423
(1400)

psi1:4:8 In contact with soil

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