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Internal structure characterization of asphalt concrete using 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]

This study is carried out to develop the workflow from image acquisition

to numerical simulation for asphalt concrete (AC) microstructure. High

resolution computed tomography (CT) images are acquired and the image quality

is improved using digital image processing (DIP). Non-uniform illumination which

results in inaccurate phase segmentation is corrected by applying an illumination

profile to correct the background and flat-fields in the image. Distance map based

watershed segmentation is used to accurately segment the phases and separate

the aggregates. Quantitative analysis of the microstructure is used to determine

the phase volumetric relationship and aggregates characteristics. The results of

the phase reconstruction and internal structure quantification using this procedure

shows a very high level of reliability.

Numerical simulations are carried out in Two dimensions (2D) and Three dimensions

(3D) on the processed AC microstructure. Finite element analysis (FEM) is

used to capture the strength and deformation mechanisms of the AC microstructure.

The micromechanical behaviour of the AC is investigated when it is considered

as a continuum and when considered as a multi-phase model. The results

show that the size and arrangement of aggregates determines the stress distribution

pattern in the mix.


Place, publisher, year, edition, pages
2013. , 100 p.
TSC-MT, 13-002
Keyword [en]
X-ray computed tomography, digital image processing, finite element
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-127689OAI: diva2:645191
Available from: 2013-09-03 Created: 2013-09-03

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