Concrete strength classes
The upper end of nominal (by-volume) mixing. At and above M25, a design mix by weight with tested materials is preferred for structural work.
| Designation | M25 |
|---|---|
| Ratio (by volume) | 1 : 1 : 2 |
| Cement | 1 part |
| Sand | 1 part |
| Aggregate | 2 parts |
| Typical compressive strength | 3,625 psi · 25 MPa |
| Typical use | Reinforced footings, columns, structural slabs. |
The upper end of nominal (by-volume) mixing. At and above M25, a design mix by weight with tested materials is preferred for structural work.
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.
Applications
Same family