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for testing the hardness properties of rock, Standard impact energy, 2.207 Nm.
| Code | LCN656 |
| Weight (kg) | 0.6 |
| Tariff | 902480 90 |
The features of the hammer make it ideal for rock testing applications:
- Impact Angle Independence: The rebound value is independent of the impact direction.
- Optimised for Field Work: Tighter sealing against dirt and dust intrusion for longer life. Significantly lighter and more ergonomic than the classic Schmidt hammer. A large number of readings can be saved and downloaded later to a PC.
- Pre-set Statistics: Statistics methods recommended by ISRM and ASTM are implemented into the hammer for automatic calculation of the rebound number. The option is also there to define a user specific statistics method.
- Unconfined Compressive Strength: ISRM recommends a correlation between UCS and the rebound value based on the formula
- UCS = aebR (where R is the rebound value). A correlation in this format may be defined in the PC software and downloaded onto the Rock Schmidt.
- E-Modulus: ISRM recommends a correlation between elastic modulus and the rebound value based on the formula Et = cedR (where R is the rebound value). A correlation in this format may be defined in the PC software and downloaded onto the Rock Schmidt.
- Weathering Grade: Impacting on the same location twice can be used to correlate to weathering grade. The ISRM recommended method has been included in the device.
Applications:
- Geomorphological applications which investigate the bulk hardness properties of a rock outcrop
- Prediction of weathering grades
- Relative dating of landforms such as moraines and rock glaciers
- Correlation to Unconfined (or Uniaxial) Compressive Strength (UCS)
- Correlation to Young’s Modulus
- Prediction of penetration rates for tunnel boring machines and rotary drum cutters
- Testing on cores ≥ 84 mm Ø ≥ 54.7mm Ø
- Testing on rectangular blocks > 100mm thick
Type N:
- Standard impact energy, 2.207 Nm.
- Recommended for field work.
- For core testing ISRM recommends that cores should be at least moderate strength (> 80 MPa) and at least T2 size (≥ 84 mm).
Supplied as:
Rock Schmidt Type N, including battery charger with USB cable, DVD with PC software, carrying strap, grinding stone, documentation and carrying bag
| Specification: | |
| Technical Data | |
| Impact energy | (N) 2.207 Nm, (L) 0.735 Nm |
| Spring extension | 75 mm (2.95″) |
| Plunger radius | 25 mm (0.98″ |
| Dimensions of housing | 55 x 55 x 250 mm (2.16″ x 2.16″ x 9.84″) |
| Weight | 570 g |
| Memory Data | |
| No. of impacts in a series | Maximum 99 |
| Memory capacity dependent on length of test series | |
| Example | 400 series with 10 values per series |
| Example | 200 series with 20 values per series |
| Electrical data
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| Display | 17 x 71 pixels; graphic |
| Battery lifetime | >5000 impacts between charges |
| Charger connection | USB type B (5V, 100 mA) |
| Environmental conditions | |
| Operating temperature | 0 to 50°C |
| Storage temperature | -10 to 70°C |
Due to the continuous development of our products, the goods supplied may vary in detail to that illustrated on this Website.
