PSI - Issue 84

L. Pisani et al. / Procedia Structural Integrity 84 (2026) 1144–1150 L. Pisani et al. / Structural Integrity Procedia 00 (2026) 000–000

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Following the promising laboratory test results, prestressing strands of diameter 15 mm in a sugar refinery silo were measured at different silo heights. A single measurement on strands was done by both XRD and MBN at the same position. Repetition on the same wire position is reported as reading1 and reading 2. Then, the laboratory INT to MPa linear regression reported at Fig.6 has been used to convert the MBN INT into MPa, obtaining a good correlation between the two methods. 5. Conclusions While the use of XRD is a proven methodology for measuring existing tensile stress in prestressing steel, an experimental campaign has proven that MBN, properly calibrated, can yield results of the same accuracy level as XRD. The two methodologies can therefore find a very good synergy, where XRD data are used for MBN calibration, but then, thanks to the incomparable higher speed of MBN measurements, a very high number of measurements can be taken. Typical applications foresee the rapid assessment of the stress state of many parallel or twisted wires and the periodic check of external prestressing systems against stress decay in time. 6. References Carfagno, Noorai, Brauss. 1995. X-ray diffraction measurements of stresses in post-tensioning tendons https://www.e-periodica.ch/cntmng?pid=bse-re-003%3A1995%3A73%2F1%3A73%2F2%3A%3A235 Alberto Gennari Santori, Diego Esposito, Luca Righetti Francesca Ciarallo, Luca Ranedda, Davide Testa, Giuseppe Galassi , Sconocchia , 2024. Special inspection – traditional and innovative investigation techniques carried out on the “Passignano” viaduct Procedia Structural Integrity 62 (2024) 339–346 Bernardino Chiaia, Giulio Ventura, Oscar Borla, Mauro Corrado, 2023. Non-Destructive Techniques for the Stress Measurement of Prestressing Wires and Breakage Detection”, Structural 249, paper 29 https://doi.org/10.12917/STRU249.29 Mariano Angelo Zanini Flora Faleschini and Carlo Pellegrino, 2022. New trends in assessing the prestress loss in post-tensioned concrete bridges. Dipartment of Civil, Environmental,and Architectural Engineering, University of Padova, Padova, Italy https://www.frontiersin.org/articles/10.3389/fbuil.2022.956066/full Isabella Mazzatura, Walter Salvatore, Silvia Caprili, Simone Celati, Michele Mori, Massimo Gammino 2023. Damage detection, localization, and quantification for steel cables of post-tensioned bridge decks Department of Civil and Industrial Engineering, University of Pisa, Pisa, Italy SINA Site Service S.p.A (ASTM Group), Milano, Italy https://www.sciencedirect.com/science/article/pii/S2352012423014029 R.Rautiohao;J.Kivimaa;M.Moilanen 1994. Stress response of Barkhausen Noise in High carbon Steel cables and ropes. Journal of Magnetism and Magnetic Materials 129(1994) 217-225 Neslušan, M., Bahleda, F., Moravčík, M ., Zgútová, K., & Pastorek, F. 2019. Assessment of tendon prestressing after long-term service via the barkhausen noise technique. Materials, 12(20) . Behleda,F;Dreveny,I; Nenuslan,M. 2012. Employment of Barkhausen Noise Technique for Assessment of Prestressing Bars Damage with respect of their Over-stressing Metals, 2012,11,770 https://doi.org/10.3390/met11050770.