A certain RCC structure has to be constructed along sea coast and will be exposed to sea water spray. What is the exposure condition according IS 456- 2000?

Environment

Exposure Condition

Mild

Concrete surfaces are protected against weather or aggressive condition, except for those situated in the coastal area.

Moderate

Concrete surfaces sheltered from severe rain or freezing whilst wet.

Concrete exposed to condensation and rain.

Concrete in contact or buried under non-aggressive soil/groundwater.

Concrete surfaces are sheltered from saturated salt air in the coastal area.

Severe

Concrete surfaces are exposed to severe rain, alternate wetting, and drying or occasional freezing whilst wet or severe condensation.

Concrete completely immersed in seawater.

Concrete is exposed to the coastal environment.

Very severe

Concrete surfaces exposed to seawater spray, corrosive fumes, or severe freezing-thawing conditions.

Concrete in contact with or buried under aggressive sub-soil/groundwater.

Extreme

The surface of members in the tidal zone.

Members in direct contact with liquid/solid aggressive chemicals,