Jean-Paul Balayssac is Professor at IUT Paul Sabatier and LMDC Toulouse (France) in the field of non-destructive evaluation of concrete structures. He has coordinated national projects (ANR) and participates in international actions (COST, RILEM). Vincent Garnier is Professor at IUT (Aix Marseille University) and at LMA (CNRS) in the field of ultrasound and data fusion. It coordinates national projects (PIA) and a working group of COFREND on Non-Destructive Evaluations applied to civil engineering.