Abstract
This paper describes the evaluation of quality factor for coda wave in concrete material. The elastic waves propagating throughout concrete material can be coda waves because the waves are reflected, refracted scattered and superposed at aggregates or other factors, which are well known as coda reflection. Thus herein to evaluate the coda quality factor, Qc, a pulse wave is given to cylinder specimens and the amplitudes of band-passed signals propagating in concrete are obtained by wavelet analysis. Finally, we found that Qc depends on frequency and has almost linear relation, and that Q0 (Qc at 1kHz) varies with radius and density of aggregates, and has much influence on water-cement ratio, i.e., quality of cement matrix.
