Rebound Hammer Calibration(IS 13311 Pt 2 — Anvil Verification)
Calibration of rebound (Schmidt) hammers on the standard steel anvil — rebound-value verification, spring and plunger condition, per IS 13311 (Part 2) and EN 12504-2 practice.
What is Rebound Hammer Calibration?
Every rebound survey stands on one assumption: the hammer itself reads true. Springs age, plungers wear and internal friction grows — dragging rebound numbers down and making sound concrete look weak. IS 13311 (Part 2):1992 and EN 12504-2 practice anchor hammer verification on the standard steel anvil, whose expected rebound value exposes a drifting instrument instantly.
Global Lab verifies hammers on a certified calibration anvil, records the rebound series against the anvil's reference band, inspects plunger, spring and rider mechanics, and certifies fit-for-survey status — with correction guidance where values sit at band edges.
How the Rebound Hammer Calibration is Conducted
- 1
Mechanical Inspection
Plunger face, spring action and rider movement are inspected as-found. - 2
Anvil Rebound Series
The prescribed impact series is performed on the certified anvil and values recorded. - 3
Evaluation
The rebound mean is evaluated against the anvil reference band. - 4
Servicing Advice
Hammers outside band are flagged for service; borderline units get usage guidance. - 5
Certification
Anvil results and verdicts are issued via Autovity QLMS.
Applicable Test Standards
| Standard | Title | Scope | Type |
|---|---|---|---|
| IS 13311 (Pt 2):1992 | Non-Destructive Testing of Concrete — Rebound Hammer (Reaffirmed) | Method & Verification Basis | Indian Standard |
| EN 12504-2 | Testing Concrete in Structures — Determination of Rebound Number | Anvil Practice | European Standard |
| ISO/IEC 17025:2017 | Competence of Testing and Calibration Laboratories | Calibration System | International |