Nondestructive Assessment of a Jetty Bridge Structure Using Impact-Echo and Shear-Wave Techniques

Abstract

In the current investigation, nondestructive testing (NDT) techniques were applied to evaluate the condition of existing jetty bridge structure. The structure serves as an access point for the loading and unloading of various oil products. The nondestructive strategies included crack-opening measurements using the concrete crack microscope, impact-echo test to measure the depth of the different cracks, and shear-wave testing to detect various defects inside the concrete girders and prestressed ducts. Two AASHTO girders of the jetty were chosen to carry out the various NDTs. The primary objectives of the tests are to assess the overall general condition of the structure and to provide recommendations that could be used to maintain the jetty for its current usage. The combination of the two nondestructive techniques (impact-echo and shear-wave) enabled inspectors to visualize the extension of the cracks in three dimensions and to specify the location of various regions of deterioration within the structural members with a satisfactory level of efficiency. Repair recommendations for the damaged regions were made to maintain safe and economic operation of the Jetty’s facilities.