Abstract
In this work, an ultrasonic technique was developed to study the porosity and pore connectivity of recycled aggregate concretes (RACs) and to elucidate the correlations between the ultrasonic pulse velocity (UPV), recycled concrete aggregate (RCA) content, and water-accessible porosity of the resulting concrete. To estimate the changes in the degree of connectivity of the concrete pores with the amount of RCA substituted, the concrete specimens were examined at different saturation levels. The correlations between the amounts of RCA used, the UPV, and the saturation state could be determined. It was observed that the pore connectivity of the concretes increased with the amount of RCA substituted, which, in turn, increased their open porosity. These findings may facilitate the use of UPV for the estimation of open porosities of RACs at different saturation levels.
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