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What is internal sulphates attack?

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What is internal sulphates attack?

(a) Presence of natural gypsum in the aggregates

(b) Soil may contain excess of gypsum

(c) Sulphate are more usually are a result of ground water

(d) Industrial waste water

The question was posed to me in an internship interview.

This is a very interesting question from Mass Concrete and Chemical Action topic in section Durability of Concrete of Concrete Technology

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The correct choice is (a) Presence of natural gypsum in the aggregates

The explanation is: Internal sulphates attack are rarer but originates from such concrete-making materials like Presence of natural gypsum in the aggregates.

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