NDT James W-M-250 Rebound Hammer

CODE: CONC SCH HAMMER

The James Instruments W-M-250 is a manual rebound concrete test hammer, used for determining the strength characteristics of concrete.

Often referred to as a Schmidt or Swiss Hammer, this type of tool is the most widely used non destructive instrument for compressive strength determination.

This simple to use hammer measures the rebound of a spring-loaded mass impacting against the surface of the sample. The test hammer will hit the concrete at a defined energy. Its rebound is dependent on the hardness of the concrete and is measured by the test equipment.
By reference to the conversion chart, the rebound value can be used to determine the compressive strength.

When conducting the test the hammer should be held at right angles to the surface which in turn should be flat and smooth.
The rebound reading will be affected by the orientation of the hammer, when used in a vertical position (on the underside of a suspended slab for example) gravity will increase the rebound distance of the mass and vice versa for a test conducted on a floor slab.
The minimum verifiable strength is 1400 PSI (10 MPa) to approximately 9000 PSI (62 MPa). All concrete test hammers measure the surface hardness of the material they are testing; this is then correlated to concrete compressive strength.

The W-M-250 is in conformity with a wide range of international requirements and documents including EN 12504-2 Testing concrete in structures.


Product specifications
.
- Measurement Method: Concrete compressive strength
- Scale Measurement: Rebound value (can be used to esitmate MPa or PSI)
- Dimensions: 394 x 292 x 64 mm
- Weight: 900 grams

Standard package includes: W-M-250 hammer, pouch.