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.