Statistical analysis of material structural noise generated
by microstructures of scatters in a pulse-echo system, has
been habitual in tissues and certain other materials, but
scarcely applied to concrete and mortar hitherto. In these
substances, it is rather regarded as a problem that limits
ultrasonic application; this being used to detect internal
defects in relatively low ultrasonic frequencies (up to
200 kHz). In this application, however, structural noise