Test Method Statements
Rebound Hammer (Schmidt Hammer) Test
Non-destructive surface hardness test to assess concrete uniformity and estimate strength.
Reference standards: ASTM C805
Equipment
- Calibrated rebound hammer
- Test anvil
- Grinding stone
Procedure
- Verify the hammer on the anvil.
- Grind a smooth 150×150 mm test area, away from edges and rebars.
- Take 10–12 readings at least 25 mm apart, hammer perpendicular to the surface.
- Discard readings differing more than 6 units from the median; average the rest.
- Convert using the chart for the hammer orientation.
Acceptance criteria
- Use for comparison and to locate weak areas; confirm doubtful areas by core test.
Health & safety
- Wear PPE: helmet, safety shoes, gloves and eye protection.
FAQs
What is the Rebound Hammer (Schmidt Hammer) Test used for?
Non-destructive surface hardness test to assess concrete uniformity and estimate strength.
Which standard does it follow?
It is based on ASTM C805. Always follow your project specification where it differs.
Can I print or submit this?
Yes. Use Print / PDF, add your project details and submit it through your normal approval process. Get it reviewed by your engineer or consultant first.
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General guidance only, not engineering advice. Project specifications, approved drawings, manufacturer data sheets and your consultant's instructions take priority. See our Policy. This document was generated using CM PRO. Powered by CM PRO.