Ultrasonic wave attenuation measurements have been used to
successfully characterize the microstructure and material
properties of inhomogeneous materials. Recent research has applied
acoustic scattering models to predict ultrasonic attenuation in
simple cement-based materials with good results. The goal of the
current research is to extend this past work and to investigate the
influence of elastic inclusions in order to simulate a more
realistic microstructure: a cement paste matrix material that
contains both sand inclusions and air voids. The sand inclusions
simulate fine aggregates as they are present in real civil
engineering structures, while the air voids provide an additional
microstructure that is present in concrete components. This
research considers an independent scattering model as well as a
self-consistent effective medium theory approach in order to model
the scattering attenuation due to the sand inclusions in the cement
paste matrix. The research develops a reliable measurement
technique that is essential to assess wave attenuation of
particulate materials. The measured attenuation is finally compared
to the model predictions and the results are discussed.
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