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Symptoms for aggressive ASR?

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Symptoms for aggressive ASR?

(a) It will show disintegration of the concrete evidenced by loss of the cement paste

(b) It will show concrete surfaces that are very rough in areas where the paste is leached

(c) Affected concrete does not exhibit telltale features too distinctly

(d) Expansion does not occur without reaction products

This question was posed to me during an online exam.

Enquiry is from Symptoms and Diagnosis of Distress in chapter Repair Technology for Concrete Structures of Concrete Technology

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The correct choice is (d) Expansion does not occur without reaction products

Explanation: Harmful ASR expansion does not occur without reaction products. But reaction products can occur without harmful ASR expansion.

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