GATE 2021 AR – Question 32

Building Construction, Materials, and Structural Systems · Building materials characteristics & applications · 1 mark · Multiple choice

Which concrete property is assessed by a rebound-hammer test?

Permeability
Bond stress between rebar and concrete
Compressive strength
Tensile strength

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Show answer and explanation

Correct answer: (C) Compressive strength

Explanation

Rebound response measures surface hardness and is correlated, with appropriate calibration and limitations, to concrete compressive strength, C. It does not directly measure rebar bond, permeability or tensile strength. Surface condition and concrete composition influence the correlation.

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