| Exposure | Reinforced concrete | ||
| (Minimum cement content (kg/m3) | Maximum free w/c ratio | Minimum grade of concrete | |
| Mild | 300 | 0.55 | M20 |
| Moderate | 300 | 0.50 | M25 |
| Severe | 320 | 0.45 | M30 |
| Very severe | 340 | 0.45 | M35 |
| Extreme | 360 | 0.40 | M40 |
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