Measurement of cement porosity by centroid frequency profiles of ultrasonic grain noise

Authors:
L. Vergara;J. Gosálbez;J. V. Fuente;R. Miralles;I. Bosch
Affiliations:
ETSI Telecomunicación, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, España;ETSI Telecomunicación, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, España;Instituto Tecnológico de la Construcción (AIDICO), Parc Tecnològic, 46980 Paterna, Valencia, España;ETSI Telecomunicación, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, España;ETSI Telecomunicación, Universidad Politécnica de Valencia, Camino de Vera s/n, 46022 Valencia, España
Venue:
Signal Processing
Year:
2004

Citing 1
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Abstract

In this paper, we propose a technique for material characterization by using centroid frequency profiles (CFP) of ultrasound echo signals. These echo signals are composed by grain noise due to the superposition of many small echoes from the inner microstructure plus observation noise. A CFP indicates the centroid frequency dependence on depth, corresponding to power spectrum density assessments at different depths. We show in the paper the relation between the mean and variance of the CFP and the grain-to-observation-noise-ratio (GOR) at every depth. The GOR depends on the material ultrasound attenuation, so that CFP may be used for material characterization. Although we consider here the estimation of cement paste porosity, the proposed technique may have general applicability. Cement paste is the main component of mortar and concrete. Therefore, cement porosity is an important problem because the vulnerability (and thence the durability) of these construction materials to external agents depends heavily on it. Experiments have been made to show the correlation between cement paste porosity and a penetration parameter obtained from the CFP.