|Environ-ment||Exposure Conditions||Minimum N/mm2|
|Mild||Concrete surfaces protected against weather or aggressive conditions||30||25||20||20||20**||20**||20**|
|Concrete surface away from severe rain |
Concrete subject to condensation
Concrete surfaces continuously under water
Concrete in contact with nonaggre-ssive soil
|Severe||Concrete surfaces exposed to severe rain, alternate wetting and drying or severe condensation||45||40||30||25||25||20|
|Concrete surfaces exposed to sea water spray, corrosive fumes||50||40||30||30||25|
|Extreme||Concrete surfaces exposed to abrasive action, e.g. sea water carrying solids or flowing water with pH ≤ 4.5 or machinery or vehicles||60||50||40||30|
|Maximum water/cement ratio||0.65||0.65||0.60||0.55||0.50||0.45||0.42|
|Minimum cement content, (kg/m3)||315||325||350||375||400||410||420|
|* This table relates to aggregate of 20 mm nominal maximum size.|
** May be reduced to 15 mm provided the nominal maximum aggregate size does not exceed 15 mm.
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