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Concrete cover (mm) and maximum mean value of carbonation coefficient (mm/years0.5) required for exposure resistance classes (ERC) given for XC3 exposure class.
| Exposure Resistance Classes (ERC) | XRC 0.5 | XRC 1 | XRC 2 | XRC 3 | XRC 4 | XRC 5 | XRC 6 | XRC 7 |
|---|---|---|---|---|---|---|---|---|
| Cover (mm) | 10 | 10 | 15 | 20 | 25 | 25 | 35 | 40 |
| Maximum carbonation coefficient (mm/years0.5) | 0.6 | 1.2 | 2.4 | 2.7 | 3.6 | 4.5 | 5.4 | 6.4 |
