Material Recipes & Design Mixes
3000 psi Concrete Design Mix (≈21 MPa)
Typical per-m³ starting quantities for 3000 psi concrete used in PCC, light slabs and non-critical members. Indicative trial-mix starting point only. Final proportions must come from a lab trial mix (ACI 211.1) using your actual cement, sand and aggregate, approved by the consultant.
Reference standards: ACI 211.1, ASTM C39, ASTM C143
| Material | Per m³ | Notes |
|---|---|---|
| Cement (OPC) | 320 kg (6.4 bags) | Grade 42.5 |
| Water | 176 L | w/c ≈ 0.55 |
| Sand (FM 2.6–2.8) | 760 kg | Clean, SSD |
| Coarse aggregate 20 mm | 1,100 kg | Crushed, SSD |
| Nominal ratio | ≈ 1 : 2 : 4 | By volume, for reference |
Mixing & application
- Get cement, sand, aggregate and admixture tested and approved before the trial for 3000 psi.
- Correct the water for aggregate moisture and absorption on the day of mixing.
- Batch by weight: aggregate, sand, cement, then 80% of water, admixture, remaining water.
- Mix in a drum or batching plant for at least 2 minutes until uniform.
- Check slump (target 75–100 mm) and temperature at the point of placing.
- Cast 6 cylinders (150×300 mm) per trial; test 3 at 7 days and 3 at 28 days.
- Target mean strength f'cr = f'c + 1.34s or f'c + 8.3 MPa when no history exists; adjust and repeat if short.
Acceptance criteria
- No single cylinder below f'c − 3.5 MPa.
- Average of any 3 consecutive tests ≥ 20.7 MPa.
Health & safety
- Wear PPE: helmet, safety shoes, gloves and eye protection.
- Wet cement causes burns — wash skin immediately.
FAQs
What is the 3000 psi Concrete Design Mix (≈21 MPa) used for?
Typical per-m³ starting quantities for 3000 psi concrete used in PCC, light slabs and non-critical members. Indicative trial-mix starting point only. Final proportions must come from a lab trial mix (ACI 211.1) using your actual cement, sand and aggregate, approved by the consultant.
Which standard does it follow?
It is based on ACI 211.1, ASTM C39, ASTM C143. Always follow your project specification where it differs.
Can I print or submit this?
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General guidance only, not engineering advice. Project specifications, approved drawings, manufacturer data sheets and your consultant's instructions take priority. See our Policy. This document was generated using CM PRO. Powered by CM PRO.