As per IS 456: 2000, the minimum grade of concrete to be used for plain concrete and reinforced concrete, respectively, in concrete works exposed directly along the sea coast are:

As per IS 456: 2000, the minimum grade of concrete to be used for plain concrete and reinforced concrete, respectively, in concrete works exposed directly along the sea coast are:

Right Answer is:

M25 and M40

SOLUTION

Concrete in Sea-water (as per IS 456: 2000)

Concrete in sea-water or exposed directly along the sea-coast shall be at least M20 Grade in the case of plain concrete and M 30 in case of reinforced concrete. The use of slag or pozzolana cement is advantageous under such conditions.

Exposure class Environmental condition Minimum grade required for reinforced concrete Minimum grade required for Plain concrete
Mild Concrete surface protected against aggressive conditions. M20
Moderate Concrete surface sheltered from severe rain or continuously underwater M25 M15
Severe Concrete surface:

1. Exposed to severe rain and alternate wetting and drying

2. Completely immersed in sea water

3. Exposed to coastal environment

M30 M20
Very severe Concrete surface exposed to sea water spray M35 M20
Extreme Surface members in tidal zone M40 M25
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