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Ultrasonic Evaluation of Concrete

Ultrasonic analysis techniques have been developed for evaluating the internal structure of concrete and related materials. The penetration of ultrasound into concrete has been evaluated at a wide range of frequencies, where it is found that the penetration follows a linear inverse dependence on frequency. From this information it is possible to establish both the maximum penetration and the spatial resolution of ultrasonic analysis. Using backscattering from a concrete block, stochastic scattering from the internal structure is illustrated. Signal enhancement is obtained by using weighted deconvolution to obtain wideband pulse analysis from which axonometric plots of internal structure can be derived.