Question
Download Solution PDFAccording to IS 456, what is the minimum cover required for reinforcement in a concrete beam exposed to a mild environmental condition?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
|
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 |
As per IS 456: 2000, the nominal reinforcement under different environmental conditions is as shown in the table below:
|
Exposure |
Nominal Cover (mm) |
|
Mild |
20 |
|
Moderate |
30 |
|
Severe |
45 |
|
Very Severe |
50 |
|
Extreme |
75 |
|
Exposure class |
Environmental condition |
|
Mild |
Concrete surface protected against aggressive conditions. |
|
Moderate |
Concrete surface sheltered from severe rain or continuously underwater |
|
Severe |
Concrete surface: 1. Exposed to severe rain and alternate wetting and drying 2. Completely immersed in seawater 3. Exposed to the coastal environment |
|
Very severe |
Concrete surface exposed to seawater spray |
|
Extreme |
Surface members in the tidal zone |
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