engleski

On the possibility of rapid nondestructive determination of compressive strength

In this work we were able to correlate the compressive strength of calcium aluminate cement mortar specimens to the features of the through-transmitted longitudinal ultrasonic pulse. The procedure is based on the description of the first part of through-transmitted ultrasonic pulse as a single Gaussian wave packet. A group of three parameters of Gaussian wave packet (Aω /tC), namely envelope amplitude, A [V], angular frequency, ω [rad s– 1], and wave packet center transit time, tC [μ s] are proportional to the compressive strengths measured. Based on the simple model of one-dimensional longitudinal ultrasonic wave propagation, we were able to show the physical meaning of the Aω /tC group of parameters as a maximum compressive stress of the material accompanying longitudinal ultrasonic wave propagation. We propose that these findings could be valid for other cement materials and also contribute to the development of the methods for rapid characterization of building materials.

calcium cluminate cement; NDT; ultrasound; compressive strength

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