Non-Destructive Testing of the Unique Structure Made of Post-Tensioned Concrete

Abstract

The paper describes the non-destructive in situ testing of the unique worldwide post-tensioning concrete load-bearing structure of a two-segment high building, which has been in operation for over 40 years. The scope of the tests included the determination of the number and location of the prestressing cables and the filling of the cable ducts with cement injection, which protects the prestressing steel against corrosion. Three complementary nondestructive methods, including ultrasonic tomography, and apparatus equipped with specialized software useful for recording and analyzing the obtained results, were used in the investigation. For the purpose of the conducted research, an original methodology of non-destructive testing of massive post-tensioned concrete structures has been developed, which may also be useful for other researchers who are faced with the problem of testing such structures.