GNGTS 2023 - Atti del 41° Convegno Nazionale

Session 3.2 ___ GNGTS 2023 a correct calibration, can identify rebars’ depth in precast segments with high precision. Of course, the acquisition methodology is fundamental. The closer the GPR measurement lines are, the more detailed a map of the lines depth and geometry is obtained. The results show that the GPR method, conducted in the right way with precision and accuracy, can be a good solution for the purpose, in addition to being a fast and accurate method. References Feng D., Wang X., Zhang B.; 2018: Specific evaluation of tunnel lining multi-defects by all-refined GPR simulation method using hybrid algorithm of FETD and FDTD . Constr. Build. Mater, 185, 220–229. Garrido I., Solla M., Lagüela S., Fernández N.; 2020: IRT and GPR Techniques for Moisture Detection and Characterisation in Buildings. Sensors 20(22), 6421; https://doi.org/10.3390/s20226421. Harseno R.W., Lee S.-J., Kee S.H., Kim S.; 2022: Evaluation of Air-Cavities behind Concrete Tunnel Linings Using GPR Measurements. Remote Sens. 2022, 14, 5348. https://doi.org/10.3390/rs14215348. Hugenschmidt, J., Loser, R. Detection of chlorides and moisture in concrete structures with ground penetrating radar. Mater Struct 41, 785–792 (2008). https://doi.org/10.1617/s11527-007-9282-5 Koyan, P.; Tronicke, J.; Allroggen, N.; Kathage, A.; Willmes, M. Estimating moisture changes in concrete using GPR velocity analysis: Potential and limitations. In Proceedings of the 2018 17th International Conference on Ground Penetrating Radar (GPR), Rapperswil, Switzerland, 18–21 June 2018; Institute of Electrical and Electronics Engineers Inc.: New York, NY, USA, 2018 Lalagüe A., Lebens M.A., Hoff I., Grøv E.; 2016: Detection of Rockfall on a Tunnel Concrete Lining with Ground-Penetrating Radar (GPR) . Rock Mech. Rock Eng. 2016, 49, 2811–2823. Li D., Yan E.; 2021: An Improved GPR Method Based on BP and RPCA for Tunnel Lining Defects Detection and Its Application in Qiyue Mountain Tunnel, China. Appl. Sci . 11, 10234. https://doi.org/10.3390/app112110234 Parkinson G., Ékes C.; 2008: Ground penetrating radar evaluation of concrete tunnel linings. Proceedings of the 12th International Conference on Ground Penetrating Radar, Birmingham, UK. Pizzarotti E.M.; 2019: Brenner Base Tunnel, Italian Side: Construction methods for a railway 22 km long tunnel. DOI: 10.1201/9780429424441-394 Reference author: Domenico Di Massa - Domenico.dimassa@socotec.com