Ground Penetrating Radar (GPR): an application for evaluating the state of maintenance of the building coating

G. Leucci, S. Negri, M. T. Carrozzo


Ground Penetrating Radar (GPR) is a non-destructive methodology. For the localisation of buried structures, it
uses short time duration electromagnetic (EM) pulses lasting from about 1 ns to about 30 ns. Therefore, GPR is
characterised by a wide frequency band ranging from 10 MHz to some GHz, and is useful in the localisation of
EM discontinuities in the subsurface with high resolution. This paper describes an application of GPR to evaluate
the state of maintenance of some travertine panels attached to the inside walls of a building housing the Bank of
Naples in Campobasso and in danger of falling because of the numerous voids present between the wall and the
panels. The aim of the survey was to assess whether the GPR technique could be used to detect the voids behind
the travertine panels. The study was made to assist the design of the restoration works of the travertine covering.
Because of the very narrow thickness of both the travertine plates and the voids, special care was needed in the
acquisition and processing steps. The measurements were performed on two panels: one purposely put on to the
laboratory wall with a known position of the voids; the other one selected from among the panels to be restored.
Although pushed to the limit of the resolution achievable by the available antenna, the study has given quite good


GPR investigation;GPR resolution;travertine panel;time slices

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Published by INGV, Istituto Nazionale di Geofisica e Vulcanologia - ISSN: 2037-416X