SYMPOSIA PAPER Published: 01 January 1999

Drilling Resistance as an Indicator for Effectiveness of Stone Consolidation


The drilling resistance measurement as a minimally destructive test method has been applied for more than ten years in stone conservation. The main fields of application have been to determine the depth of crusts or surface scaling areas and exfoliations. The aim of investigations at IBAC was to find a correlation between the biaxial tensile strength in bending and the drilling resistance for untreated and treated natural stones. The strengthening caused by the polymer impregnation was established by both measurements. The factor of increasing strength was different dependent on the method. The drilling resistance can be used for site application before and after a consolidation to assess the penetration depth and consolidation of the treated areas. The advantage of drill holes of 3 mm diameter compared with drilling cores of 50 mm diameter for investigations into depth is self-explanatory.

Author Information

Lotzmann, S
Research Group Coating and Adhesion, ibac- Institute for Building Research, Aachen, Germany
Sasse, HR
Organic Construction Material, ibac- Institute for Building Research, Aachen, Germany
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Developed by Committee: E06
Pages: 77–89
DOI: 10.1520/STP14183S
ISBN-EB: 978-0-8031-5403-2
ISBN-13: 978-0-8031-2606-0