Concrete strength classes
M30 and above are design mixes — proportioned by weight from tested materials to a target strength, not from a fixed nominal ratio. Always from an engineer's mix design.
| Designation | M30 |
|---|---|
| Ratio (by volume) | Design mix |
| Design mix by weight | Design mix parts |
| Typical compressive strength | 4,350 psi · 30 MPa |
| Typical use | Structural columns, beams, suspended slabs. |
M30 and above are design mixes — proportioned by weight from tested materials to a target strength, not from a fixed nominal ratio. Always from an engineer's mix design.
Nominal mixes like this are proportioned by volume on site and suit general and domestic work. Anything structural — reinforced, load-bearing or engineered — should use a design mix proportioned by weight from tested materials.
Need quantities? The volume calculators give the cubic yards, cubic metres and bag counts for the pour this mix goes into.
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