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What is external sulphates attack?

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What is external sulphates attack?

(a) Industrial waste water

(b) Presence of natural gypsum in the aggregates

(c) Hydraulic cements

(d) Portland cement might be over-sulphated
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The correct choice is (a) Industrial waste water

The best explanation: External sources of sulphate are very common and are usually are a result of high-sulphate soils and ground waters or can be result into industrial pollution.
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