Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE credits
The behavior of the asphalt mixtures under large deformations, for example an
unconfined compaction is of high practical importance. Quantitative measurement of
the spatial distribution of internal structure of asphalt mixtures is crucial to study
deformation behavior of asphalt mixtures. Deformation of granular material under an
unconfined compaction is investigated in this study, as a groundwork for further
research on deformation behavior of asphalt mixtures. Two sets of 3D images of
specimens are obtained using X-Ray computed tomography (CT) under an unconfined
compaction. Digital image analysis procedure is developed to segment different
phases for characterizing spatial distribution of internal structure. Comparative
volumetric relationship before and after compaction showed that air void distribution
is not changed heavily due to absence of interlocking. Initial and final spatial
positions of individual granules are investigated to trace their movement under
compaction. It is shown that X-Ray CT could be a useful tool to characterize internal
structure of asphalt mixtures and its evolution during deformation.
2013. , 57 p.