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What must be the minimum grade of concrete to be used for a reinforced concrete structural element which is exposed to extreme exposure conditions?

What must be the minimum grade of concrete to be used for a reinforced concrete structural element which is exposed to extreme exposure conditions? Correct Answer M40

Concept:

As per IS 456: 2000, Table 5;

Environment

Minimum grade of RCC

Minimum grade of PCC

Nominal Cover

1. Mid

M 20

-

20 mm

2. Moderate

M 25

M 15

30 mm

3. Severe

M 30

M 20

45 mm

4. Very severe

M 35

M 20

50 mm

5. Extreme

M 40

M 25

75 mm

According to IS 456: 200, the Minimum cement content and maximum water-cement ratio based on exposure conditions for plain cement concrete and reinforced cement concrete are given below:

Exposure condition Minimum cement content (kg/m3) maximum water-cement ratio Minimum cement content (kg/m3) maximum water-cement ratio
  PCC RCC
Mild 220 0.6 300 0.55
Moderate 240 0.6 300 0.5
Severe 250 0.5 320 0.45
Very severe 260 0.45 340 0.45
Extreme 280 0.40 360 0.4

 

Extreme exposure condition: When the surface of member in the tidal zone and Members in direct contact with liquid/ solid aggressive chemicals.

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