Non destructive assessment of in situ concrete strength: comparison of approaches through an international benchmark

D. Breysse^*, J. P. Balayssac, S. Biondi, A. Borosnyói, E. Candigliota, L. Chiauzzi, V. Garnier, M. Grantham, O. Gunes, V. Luprano, A. Masi, V. Pfister, Z. M. Sbartai, K. Szilagyi, M. Fontan