Ultrasonic Testing of Concrete Structures Using Indirect Transmission
Stergiopoulou C, McCuen RH, Aggour MS
(Received 23 March 2007; accepted 10 October 2007)

Abstract

Laboratory studies and computer simulation were used to develop a procedure for the interpretation of the results of nondestructive testing of concrete structures using the indirect transmission method. The results of the laboratory studies indicate a 10-cm spacing is best for making ultrasonic pulse measurements. A new method of calculating the velocity of the pulse is presented. The method enables concrete quality to be evaluated over short distances rather than the existing method which gives a mean velocity over an extended distance. The method can thus determine the extent of delamination of concrete at a specific location. The laboratory analyses verified using computer simulations show the effect of concrete heterogeneity on the detection of variation in concrete quality. Ultrasonic pulse velocities have a coefficient of variation of about 2 %.

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Author Stergiopoulou C, McCuen RH, Aggour MS Title Ultrasonic Testing of Concrete Structures Using Indirect Transmission Symposium , Committee on