visual check also underwater

data gathering

thickness measurement also underwater

physical measurements

carbonation measurement

chloride content test

pile integrity test for detecting anomalies and to determine the length of fixity (if unknown)

pull-in and pull-out tests

hardness measurements

conductivity measurements

monitoring system to monitor the behavior of the structures and check possible changes

Operating Modal Analysis, based on the monitoring system, defining the own frequency in which the structure vibrates under environmental loads that being correlated to the stiffness of the structure is used to point out anomalies