Concrete Mix Design Reference
Standard concrete mix designs by grade from C20 to C50. Includes cement content, water-cement ratios, aggregate proportions, slump requirements, and strength development curves for construction projects.
Standard mix proportions per cubic meter of concrete. Select a grade to view detailed proportions.
Blinding, non-structural
General structural work
Slabs, beams, columns
Post-tensioned, foundations
High-rise, precast
Special structures
| Grade | Cement | Water | W/C | Slump |
|---|---|---|---|---|
| C20/25 | 300 | 180 | 0.6 | 75-100mm |
| C25/30 | 340 | 175 | 0.55 | 75-100mm |
| C30/37 | 380 | 170 | 0.5 | 100-150mm |
| C35/45 | 400 | 165 | 0.45 | 100-150mm |
| C40/50 | 420 | 160 | 0.42 | 150-200mm |
| C50/60 | 450 | 155 | 0.38 | 150-200mm |
All values in kg/m³ unless otherwise noted
Typical strength development as % of 28-day strength (OPC at 20°C)
| Age (days) | % of 28-day Strength | C30 Approx. (MPa) |
|---|---|---|
| 1 days | 16% | 4.8 MPa |
| 3 days | 40% | 12.0 MPa |
| 7 days | 65% | 19.5 MPa |
| 14 days | 85% | 25.5 MPa |
| 28 days | 100% | 30.0 MPa |
| 56 days | 110% | 33.0 MPa |
| 90 days | 115% | 34.5 MPa |
Water/Cement Ratio
Lower W/C ratio = higher strength but reduced workability. Minimum W/C for hydration is ~0.25.
Slump Test
Higher slump = more workable. Typical: 75-100mm for beams/slabs, 150-200mm for congested areas.
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Get complete mix design reference with admixture guidelines
Notes:
- Mix designs are indicative - actual mixes depend on local materials
- Aggregate proportions based on 20mm nominal maximum size
- Adjust water content for aggregate moisture condition
- Consider admixtures for improved workability or durability
- Hot weather concreting may require different mix design
REFERENCE INFORMATION
This tool provides standard reference data compiled from industry sources.
Note:
• Data is provided for quick reference and may not reflect the most current standards or specifications.