Ultrasonic testing.

Evaluation of concrete properties from sonic tests Whitehurst, E. A. 1966 Ultrasonic Testing of Materials Krautkramer, Josef 2003 Ultrasonic testing of materials Krautkramer, J. 1993 Ultrasonic testing of materials Krautkrämer, Josef 1990 Ultrasonic testing of materials Krautkrämer, Josef 1983 Ultrasonic testing of materials Krautkrämer, Josef 1969