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concrete cover

  Environ-ment Exposure Conditions Minimum  N/mm2
      20 25 30 35 40 45 50
  Mild Concrete surfaces protected against weather or aggressive conditions 30 25 20 20 20** 20** 20**
Nom-
inal
cover
(mm)
Mode-
rate
Concrete surface away from severe    rain
Concrete subject to condensation
Concrete surfaces continuously under water
Concrete in contact with nonaggre-ssive soil
40   35 30 25 20 20 20
  Severe Concrete surfaces exposed to severe rain, alternate wetting and drying or severe condensation   45 40 30 25 25 20
  Very
severe
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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