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Investigation of granular materials deformations under an unconfined compaction with x-ray computed tomography.
KTH, School of Architecture and the Built Environment (ABE), Transport Science, Highway and Railway Engineering.
2013 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

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.


Place, publisher, year, edition, pages
2013. , 57 p.
TSC-MT, 13-006
Keyword [en]
X-Ray Computed Tomography, Unconfined compaction, Digital image
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-127690OAI: diva2:645199
Available from: 2013-09-03 Created: 2013-09-03

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