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
|
