ABSTRACT
The need to assess the structural condition of existing concrete structures strongly supports the development of Non Destructive Testing (NDT) techniques, in order to evaluate the degree of decay and to estimate mechanical parameters such as strength and stiffness (Concu, 2014, Puccinotti, 2015). Among NDT, Ultrasonic Testing (UT) is frequently applied, because the velocity of ultrasonic signals travelling through the material is directly related to mechanical and physical parameters, e.g. dynamic elastic modulus, Poisson’s ratio and density.
