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If the coefficient of the two materials differ by more than 5.4 * 10^-6 per ^oC, then?

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If the coefficient of the two materials differ by more than 5.4 * 10^-6 per ^oC, then?

(a) Workability of concrete may freeze

(b) Durability of concrete subjected to freezing

(c) Durability of concrete subjected to boiling

(d) Workability of concrete subjected to boiling

The question was asked in a job interview.

My doubt is from Thermal Properties in chapter Aggregates and Testing of Aggregates of Concrete Technology

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The correct choice is (b) Durability of concrete subjected to freezing

The best I can explain: If the coefficient of the two materials differ by more than 5.4 * 10^-6 per ^oC, then the Durability of concrete subjected to freezing and thawing may be affected.

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