Question

Rebound hammer test is used to measure

• A. permeability of concrete.
• B. bond stress between rebar and concrete.
• C. compressive strength of concrete.
• D. tensile strength of concrete.

Hint:

Use the rebound hammer to assess the compressive strength of concrete quickly without damaging the structure.

Answer 1

The Correct Option is C

The rebound hammer test, also known as the Schmidt hammer test, is a non-destructive test used to measure the compressive strength of concrete. The test works by firing a spring-loaded mass against the surface of the concrete and measuring the rebound of the hammer. The rebound value correlates with the compressive strength of the concrete, making it a useful tool for field testing.
Why the other options are incorrect:
- Permeability (A): The rebound hammer does not measure permeability but strength.
- Bond stress (B): The rebound hammer does not measure the bond between rebar and concrete.
- Tensile strength (D): The rebound hammer does not measure tensile strength but compressive strength.
Thus, the correct answer is (C).