Abstract

The conventional ultrasonic method of checking surface properties of concrete is subject to large errors due to low signal amplitude generated by normal pressure wave transducers. This paper illustrates a series of measurements using an ultrasonic goniometer, on mortar, concrete and rock samples. A 2.25 MHz 10 mm-diameter immersion transducer was used to propagate Rayleigh waves in a sample surface by corner reflection method. The experimental results show a significant change in velocity and amplitude of the Rayleigh wave, with different concrete quality. This means that it is possible to use a pure Rayleigh wave to check the quality of concrete surfaces or sub-surfaces, as a better alternative to the conventional method.

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