The characterisation of old concrete using destructive and the ultrasonic non-destructive testing methods

摘要

The basic objective of the present experimental investigation is to contribute to the development of the ultrasonic nondestructive testing (NDT) method for the improved nondestructive characterisation of concrete. Of all known NDT methods for testing, the most promising seems to be the use of ultrasonics, because through this method several mechanical properties of concrete can be determined. Two approaches seem promising. In the first of them the velocity, whereas in the second one the damage of ultrasonic waves in concrete are used. In this experimental work, destructive and ultrasonic NDT methods are applied in order to study the damage evolution versus the compressive loading of 30 year-old concrete.