ABSTRACT
Non-destructive testing methods (NDT methods) have been successfully used for decades in the building industry. These methods enable the survey of a structure’s condition, without causing further destruction. However destructive testing methods are impossible to avoid altogether. But based on the results of previously conducted nondestructive testing methods, the destructive testing methods can be implemented at specific targets and therefore limit the damage to only the necessary amount, which is better for both the property owner as well as the structure. The low-frequency ultrasonic echo method and the impulse radar make it possible today to answer questions in the assessment of concrete structures and reinforced concrete structures, which with previous NDT methods were not solvable or only solvable with restrictions.
