Tools · Concrete · IS 10262:2019
Concrete mix design
Enter the grade, exposure and your material test results. You get quantities per m³ and per bag, and the full IS 10262 working, clause by clause.
Design data
Chemical admixture
Material tests
M30 mix proportion per m³
Ratio by mass: 1 : 2.01 : 3.54 with w/c 0.45. Fresh density ≈ 2,456 kg/m³. Field values correct for the absorption and moisture you entered.
For a batch
| Material | Per m³ (kg) | For 1.00 m³ (kg) | Per 50 kg bag (kg) |
|---|---|---|---|
| Cement | 350.5 | 350.5 | 50.00 |
| Water | 171.0 | 171.0 | 24.39 |
| Fine aggregate | 697.5 | 697.5 | 99.50 |
| Coarse aggregate | 1,234.2 | 1,234.2 | 176.05 |
| Admixture | 2.8 | 2.8 | 0.40 |
Step by step (IS 10262:2019)
- Target strengthIS 10262:2019 cl. 4.2, Tables 1 and 2
f′ck = fck + 1.65 S = 30 + 1.65 × 5 = 38.25 N/mm²
f′ck = fck + X = 30 + 6.5 = 36.50 N/mm²
Adopt the higher: f′ck = 38.25 N/mm²
- Entrapped airTable 3
For 20 mm aggregate, air content = 1%
- Water-cement ratioFig. 1 and IS 456 Table 5
Free w/c for strength from Fig. 1 (OPC 53 curve, approximate) = 0.461
Maximum w/c for durability (RCC, severe) = 0.45
Adopt w/c = 0.450
- Water contentcl. 5.3, Table 4
Water for 50 mm slump, 20 mm angular aggregate = 186 kg/m³
Increase 3% per 25 mm slump above 50 mm: +6.0% → 197.2 kg/m³
Admixture reduces water by 20% → 157.7 kg/m³
- Cement contentcl. 5.4, IS 456 Table 5
Cement = 157.70.450 = 350.5 kg/m³
More than the minimum 320 kg/m³ for severe exposure, OK
- Coarse and fine aggregate proportioncl. 5.5, Table 5
From Table 5 for 20 mm aggregate and Zone II sand at w/c 0.50: 0.62
Correction of 0.01 per 0.05 change in w/c: +0.010 → 0.630
Fine aggregate fraction = 0.370
- Mix calculation per m³cl. 5.6
Volume of concrete less air = 1 − 0.010 = 0.990 m³
Volume of cement = 350.53.15 × 1000 = 0.1113 m³
Volume of water = 157.71000 = 0.1577 m³
Volume of admixture = 2.801.145 × 1000 = 0.0024 m³
Volume of all-in aggregate = 0.7186 m³
Coarse aggregate = 0.7186 × 0.630 × 2.74 × 1000 = 1240.4 kg
Fine aggregate = 0.7186 × 0.370 × 2.65 × 1000 = 704.5 kg
- Field correction for absorption and moisturecl. 5.7
Coarse aggregate: absorption 0.5%, free moisture 0% → water +6.2 kg
Fine aggregate: absorption 1%, free moisture 0% → water +7.0 kg
Field water = 171.0 kg/m³
The w/c from Fig. 1 here is a smooth fit to the code’s curves, so it can differ by about 0.01 to 0.02 from a value read off the printed chart; type your own value above to override it. A design mix is only a starting point: make trial mixes and confirm the slump and 28-day strength (cl. 6) before using it on site.