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Concentration of water-soluble sulphates in water ___________ ppm for mild exposure.

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Concentration of water-soluble sulphates in water ___________ ppm for mild exposure.

(a) <150

(b) 150-1500

(c) 150-10000

(d) >10000

The question was asked during an online exam.

This intriguing question originated from Permeability in section Durability of Concrete of Concrete Technology

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Best answer
Correct choice is (a) <150

The explanation: Concentration of water-soluble sulphates in water less than 150 ppm for mild exposure.

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