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What is the permissible limits for construction of sulphates in water?

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What is the permissible limits for construction of sulphates in water?

(a) 200mg/l

(b) 2000mg/l

(c) 1000mg/l

(d) 500mg/l

I have been asked this question at a job interview.

This intriguing question originated from Use of Sea Water for Mixing of Concrete in portion Water of Concrete Technology

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Correct choice is (d) 500mg/l

To explain I would say: 500mg/l is the standard value for the permissible limits for construction of sulphates in water.

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