HT225-A Concrete Rebound Hammer for Non-Destructive Strength Testing
R6,037.50
The ROX® HT-225-A Concrete Rebound Hammer is a mechanical non-destructive testing instrument designed to assess the surface hardness of concrete and provide an indication of estimated compressive strength. Rebound hammer testing allows contractors, inspectors and construction professionals to assess concrete without cutting cores or causing significant damage to the tested surface.
The instrument works by striking the concrete surface with a spring-loaded impact mechanism and measuring the resulting rebound. Harder concrete generally produces a higher rebound value, while softer surfaces produce a lower rebound value. The rebound number can then be interpreted using the appropriate conversion table.
Concrete rebound testing is particularly useful for comparing the relative quality and uniformity of different areas of a concrete structure, identifying potentially weaker zones and carrying out preliminary assessments before further investigation.
For flooring contractors, the rebound hammer can provide useful information when assessing existing concrete slabs before grinding, repairing, coating or installing a flooring system. It should, however, be treated as an indirect testing method and not as a replacement for laboratory testing or structural engineering assessment where definitive strength verification is required.
Other names: Schmidt Hammer, durometer or Swiss hammer.
| Code | Description | Weight | Size |
|---|---|---|---|
| 33/5/009 | CONCRETE REBOUND HAMMER | 1 kg | 280 x 55 mm |
A concrete rebound hammer, also known as a Schmidt hammer or concrete test hammer, is a non-destructive testing instrument used to measure the rebound hardness of concrete.
The instrument contains a spring-loaded mass that impacts the concrete surface. The distance or value of rebound is measured and expressed as a rebound number. This value can be correlated with an estimated concrete compressive strength using an appropriate conversion chart.
- Mechanical rebound testing system.
- Spring-loaded steel impact hammer.
- Durable aluminium housing.
- Portable design for site inspections.
- Approximately 1 kg instrument weight.
- Supplied with protective carrying case.
- Conversion tables for interpreting rebound readings.
- Calibration services available through FloorsHQ.
- Designed for non-destructive concrete assessment.
- Concrete slab inspections.
- Building inspections.
- Construction quality control.
- Concrete repair assessment.
- Flooring project inspections.
- Structural concrete screening.
- Concrete uniformity testing.
- Preliminary strength assessment.
- Identification of areas requiring further testing.
- Concrete testing and inspection services.
- Concrete contractors.
- Flooring contractors.
- Structural engineers.
- Civil engineers.
- Building inspectors.
- Concrete testing laboratories.
- Construction consultants.
- Property inspection professionals.
- Concrete repair specialists.
- Quality control teams.
What is a concrete rebound hammer?
A concrete rebound hammer is a non-destructive testing instrument used to assess concrete surface hardness and estimate compressive strength using appropriate correlation data.
What is a Schmidt hammer?
A Schmidt hammer is another common name for a concrete rebound hammer used to measure the rebound hardness of concrete.
What does a rebound hammer measure?
It measures the rebound response of an impact mechanism against a concrete surface. The resulting rebound number can be correlated with estimated compressive strength.
Can a rebound hammer measure concrete strength?
It can provide an estimate of compressive strength when the rebound result is interpreted using the appropriate conversion data. It does not directly measure laboratory compressive strength.
What MPa range does the HT-225A measure?
10–60 MPa.
Is rebound hammer testing destructive?
No. Rebound hammer testing is considered a non-destructive testing method and causes minimal surface disturbance compared with core sampling.
Does the testing angle affect the result?
Yes. The conversion between rebound number and estimated MPa can vary according to the direction of impact, so the correct conversion data must be used.
Can a rebound hammer be used on concrete floors?
Yes. It can be used to assess concrete slab surface hardness and compare different areas of a floor, provided the testing procedure is appropriate for the application.
Can a rebound hammer replace a concrete core test?
No. Rebound testing provides an indirect estimate and should not automatically replace laboratory testing when definitive compressive-strength verification is required.
Does the concrete surface need to be prepared before testing?
Yes. The test area should be suitable for rebound testing and prepared according to the applicable instrument and testing procedure.
How many readings should be taken?
Testing should follow the applicable standard or manufacturer's procedure, with multiple readings used to improve the reliability of the assessment rather than relying on one impact.
Does FloorsHQ provide calibration services?
Yes, calibration services are available for the concrete rebound hammer.
| Feature | Rebound Hammer | Concrete Core Test |
|---|---|---|
| Testing Method | Non-destructive | Destructive sampling |
| Surface Damage | Minimal | Requires core drilling |
| Testing Speed | Fast | Slower |
| Site Portability | Excellent | Requires coring equipment |
| Large Area Screening | Excellent | Limited |
| Strength Result | Estimated correlation | Direct laboratory testing of core |
| Best Use | Screening, comparison and uniformity assessment | Definitive investigation where specified |
Important: Rebound hammer results should not automatically be treated as equivalent to laboratory compressive-strength results. Where structural acceptance or definitive strength verification is required, use the testing method specified by the responsible engineer, testing standard or project specification.
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