In order to validate the methodology developed in WPs 1-2-3, an experimental test program is set up, consisting of a limited set of concrete elements (two beam types with different reinforcement configurations and one slab type specimen). For each specimen type, there will be 1 reference specimen, 2 specimens with different degrees of corrosion and 1 specimen with locally induced corrosion, established through accelerated testing. The specimens will first be subjected to non-destructive tests (measurements and vibration data), and consequently be subjected to destructive testing (core drilling for compression and tensile tests, reinforcement testing in relation to strength and corrosion patterns, and a 4-point bending test or shear tests).