Proportions
| Cement | 1 part |
|---|---|
| Sand | 1 part |
| Aggregate | 2 parts |
| Typical strength | 3,625 psi · 25 MPa |
Concrete mix
Concrete mix for a foundation
Reinforced foundations under heavier loads step up to M25 (1 : 1 : 2); above this, an engineered design mix is used.
Recommended mix
1 : 1 : 2cement : sand : aggregate
M25 nominal concrete — about 3,625 psi (25 MPa).
Planning reference. Typical proportions and strength for general work, not a structural mix design. Load-bearing and structural work must follow your local building code and a qualified engineer's specification.
Why this mix
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.
Once you know the mix, the volume calculators tell you how much of it to buy — cubic yards, cubic metres and the bag count in every size.
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