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Correlation to unconfined compressive strength of rock / Correlation to modulus of elasticity of rocks / Prediction of weathering grades / Classification of surfaces for drop testing / Prediction of penetration rates for tunneling machines
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Standard impact energy 2.207 Nm recommended for bulk rock testing
Low impact energy 0.735 Nm recommended for testing on cores
The Original Swiss-made rebound hammer with its unique optical measurement provides the most accurate correlations possible for rock testing applications. Measure, evaluate, report and collaborate.
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...
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 Rock Schmidt 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)
Visit the download section below to see the full Rock Schmidt Conversion Curve Database.
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