Publications / 2010 Proceedings of the 27th ISARC, Bratislava, Slovakia

3D Calibration of GPR (Ground Penetrating Radar) for Bridge Measurements - Case Kajaani Varikko Bridge

Rauno Heikkilä, Teemu Kivimäki, Anja Leppälä, Martti Mikkonen, Ty A. Lasky
Pages 29-39 (2010 Proceedings of the 27th ISARC, Bratislava, Slovakia, ISBN 978-80-7399-974-2, ISSN 2413-5844)

3D calibration was performed for a GPR measurement system for concrete bridge decks. An old bridge having been repaired approximately two years prior with a new bridge deck part was considered in the test results. The deck, including then visible subsurface features, was measured earlier during the construction phase using a 3D laser scanning system, then after construction by two different GPR measurement systems and antennas. Several subsurface structural layers as well as the deck reinforcement were measured by the GPR systems. These 3D point clouds were compared with the mid-construction laser scanned point clouds. The results showed high accuracy in measurements of reinforcement, but less accuracy in measurement of concrete surface under road layers. Future development possibilities are also discussed.

Keywords: GPR, ground penetrating radar, bridges, bridge health measurements, non-destructive evaluation