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    Drilling Resistance as an Indicator for Effectiveness of Stone Consolidation

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    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.


    drilling resistance measurement, minimum destructive test method, biaxial tensile strength in bending, natural stone, polymer impregnation, penetration depth, effectiveness of consolidation

    Author Information:

    Lotzmann, S
    Civil Engineer, Research Group Coating and Adhesion, ibac- Institute for Building Research, Aachen,

    Sasse, HR
    Professor, Organic Construction Material, ibac- Institute for Building Research, Aachen,

    Committee/Subcommittee: E06.24

    DOI: 10.1520/STP14183S