Ultrasonic inspection of prefabricated constructions using reverse time migration imaging method

In prefabricated buildings, the compactness of grouting in connection sleeve plays a decisive role in structural safety. However, there is no efficient method for inspecting the grouting quality between the rebar and the sleeves, which are embedded prefabricated constructions. Considering the important role grouting sleeve played, we innovatively propose an ultrasonic inspection method using reverse time migration, which can distinguish the defects in prefabricated constructions. Half-grouting model is constructed to simulate the common situations in practice, while no grouting and full-grouting models are built as contrast. In constructed images, the internal information of steel sleeve can be observed with high contrast, and the location of the defects can be performed clearly. It confirms the feasibility of our proposed method.