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As per IS 456:2000, Minimum grade of concrete for plain concrete exposed to sea coast is
1. M20
2. M30
3. M40
4. M25

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Correct Answer - Option 1 : M20

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

Concrete in sea-water or exposed directly along the sea-coast shall be at least M 20 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

Minimum grade of

 Plain Concrete

Minimum grade of

reinforced concrete

Mild

-

M20

Moderate

M15

M25

Severe

M20

M30

Very severe

M20

M35

Extreme

M25

M40

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