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In Concrete core test the strength is ________ at the top and _________ at the bottom.

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In Concrete core test the strength is ________ at the top and _________ at the bottom.

(a) Lowest, lowest

(b) Lowest, highest

(c) Highest, lowest

(d) Highest, highest

I had been asked this question in examination.

This interesting question is from Destructive Testing topic in portion Repair Technology for Concrete Structures of Concrete Technology

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Right choice is (b) Lowest, highest

Easiest explanation: The strength is lowest at the top surface and increases with depth through the element.

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