Question
Download Solution PDFWhat is the minimum cement content of concrete to be used for PCC required for 'severe' exposure condition?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFExplanation:
As per Table 5 of IS 456:2000, Minimum Cement Content, Maximum Water-Cement Ratio and Minimum Grade of Concrete for Different Exposures with Normal Weight Aggregates of 20 mm Nominal Maximum Size
| Exposure Condition | Plain Concrete | Reinforced Concrete | ||||
| Minimum cement content (kg/m3) | Maximum free water cement ratio | Minimum grade of concrete | Minimum cement content (kg/m3) | Maximum free water cement ratio | Minimum grade of concrete | |
| Mild | 220 | 0.60 | - | 300 | 0.55 | M20 |
| Moderate | 240 | 0.60 | M15 | 300 | 0.50 | M25 |
| Severe | 250 | 0.50 | M20 | 320 | 0.45 | M30 |
| Very Severe | 260 | 0.45 | M20 | 340 | 0.45 | M35 |
| Extreme | 280 | 0.40 | M25 | 360 | 0.40 | M40 |
Hence for 'severe' exposure conditions, the minimum cement content of concrete to be used for PCC is 250 kg/m3
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