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This Document Has Been Superseded
A newer publication replaces it: BSI BS EN 12504-2
Testing concrete -- Recommendations for surface hardness testing by rebound hammer
WITHDRAWN, 8/15/2001
Functioning of rebound hammers: The rebound hammer measures the surface hardness of concrete by the principle of rebound of a spring-loaded mass impacting a concrete surface.
Applications: It is primarily used for non-destructive testing of concrete to assess uniformity, estimate compressive strength, and detect surface defects.
Factors influencing readings: These include surface smoothness, moisture content, age of concrete, type of cement, carbonation, temperature, and the angle of impact during testing.
Method of calibration: Calibration is done using a standard calibration test block of known hardness to ensure accuracy and consistency of rebound numbers.
Testing procedure: The procedure includes:
Reporting of results: The results should detail the location of test points, rebound numbers obtained, average values, any deviations noted, and an interpretation of concrete quality based on standard correlations.
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