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

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

(a) <150

(b) 150-1500

(c) 150-10000

(d) >10000

This question was addressed to me in final exam.

I'd like to ask this question from Permeability topic in chapter Durability of Concrete of Concrete Technology

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Right option is (c) 150-10000

To explain I would say: Concentration of water-soluble sulphates in water 150-10000 ppm for severe exposure.

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