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Rebound Hammers

RockSchmidt

Rock strength and uniformity testing using rebound hammer technology

Automated working

N and L versions

Extremely durable

Applications:

Correlation to unconfined compressive strength of rock / Estimation of weathering grade / Estimation of modulus of elasticity of rock

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Adapted specifically for rock testing applications and penetration rate prediction for tunnel boring machines and rotary drum cutters

User experience

Automated working with ASTM and ISRM standards.

Versatility

N and L versions for core testing and massive rock.

Reliability

Extremely durable, optimized for fieldwork.

Sensor

Tech Specs

Impact Energy

2.207 Nm (N), 0.735 Nm (L)

Compressive Strength Range

20 to 150 MPa Unconfined (or Uniaxial) Compressive Strength (UCS)

Measurements

Impact angle independent
Series validity checked automatically
Delete impacts
Select units
Create custom curves
Create custom curve databases for different rock types

Report Generation

Using RockLink PC software included

Instrument Firmware

Custom curves
Correlation to UCS
Correlation to E-modulus
Weathering according to ISRM
Rebound according to ASTM and ISRM
Single button programming of settings

Pc Software

RockLink for data assessment and export to third party software

Display

Integrated digital display

Memory

400 series of 10 measurements

Connections

USB interface to PC

Battery

Integrated Li-ion

Battery Lifetime

>5000 impacts between charges

Operating Temperature

0° to 50°C

Languages

English, German, Japanese, Chinese, Korean, Spanish, Portuguese, Italian, French, Russian

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FAQ

Are there any rebound hammer conversion curves available for rock testing?

There are many rebound hammer correlation curves freely available for different lithologies to be found in literature on the internet. e.g. Aydin, A. & Basu, Arindam. (2005). The Schmidt Hammer in rock material characterization. Engineering Geology. 81. 1-14. 10.1016/j.enggeo.2005.06.006. Most of these curves were created with classical R-value hammers and can be used entered directly as a custom material curve in the Original Schmidt Live app. To use with the RockSchmidt it is necessary to convert to a Q-value curve. Typically the Q-value is R-value + 10. e.g. Katz et al. (2000) UCS = 2.21e(0.07R) Using the R-value curve and the corresponding Q-value it is a simple matter to derive the Q-value curve using the trendline function in spreadsheet software. UCS = 1.0975e(0.07Q)

Any questions?