Question

According to IS 456-2000, nominal cover for reinforcements in case of footings, under 'very severe' exposure:
1. shall not be less than 30 mm
2. shall not be less than 25 mm
3. shall not be less than 50 mm
4. shall not be less than 40 mm

Answer 1

Correct Answer - Option 3 : shall not be less than 50 mm

Concept:

As per IS 456 : 2000, Table 5;

Environment	Maximum 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

 

Cement content should not exceed 450 kg/m3.