What is the permissible limit of organic matter present in water for mixing concrete as per IS 456-2000?

What is the permissible limit of organic matter present in water for mixing concrete as per IS 456-2000?

Right Answer is:

200 mg/l

SOLUTION

Quality of water needed in concrete

The quantity of water in the mix plays a vital role in the strength of the concrete. Potable water that has no pronounced taste or odor is generally considered satisfactory for mixing and curing concrete. It has been observed that certain common impurities in water affect the quality of mortar or concrete. The water quality for construction shall be tested or monitored regularly, as it affects the overall strength of concrete. For plain and reinforced cement concrete permissible limits for solids in water as per IS 456 : 2000 is as follows.

Type of solid in water Max. Permissible limit in water
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
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