Question

What is the permissible limit of organic matter present in water for mixing concrete as per IS 456-2000?
1. 400 mg/l
2. 2000 mg/l
3. 3000 mg/l
4. 200 mg/l

Answer 1

Correct Answer - Option 4 : 200 mg/l

Explanation

As per clause 5.4 of IS 456 : 2000

Potable water is considered satisfactory for mixing Concrete and the permissible limits for solids is shown in table below:

Type of solid	Max. Permissible limit
Organic	200 mg/l
Inorganic	3000 mg/l
Sulphates	400 mg/l
Chlorides	2000 mg/l (concrete)
Chlorides	500 mg/l (RCC)
Suspended matter	2000 mg/l