X-ray computed tomography in hydraulics of asphalt mixtures: Procedure, accuracy, and application

The purpose of this paper is to obtain the pore distribution of asphalt mixture accurately by nondestructive technology. Specimens prepared with four gradations of asphalt mixtures were scanned using X-ray computed tomography (CT) which was used to measure air void sizes at different depths within specimens. The air void distributions of obtained CT images were analyzed using ring blocking segmentation combining Otsu’s method, which provided an accurate estimate of air voids in asphalt mixtures. The image processing results showed that air void distribution was not uniform in the specimens; higher air void concentrations were found at the top and bottom of the specimen, and lower, in the rest of the sample depth. The air void sizes of SUP13 and AC13 are mainly distributed between 0.15 to 0.2 mm, while PA13 and SMA13 are 0.4 to 0.65 mm and 0.4 to 0.7 mm, respectively. It is believed that the CT pictures processed by the ring blocking segmentation combining Otsu’s method is feasible and rational to capture the air voids size and content of asphalt mixtures.+

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Practical lessons learnt from the application of X-ray computed tomography to evaluate the internal structure of asphalt mixtures

DYNA ◽

10.15446/dyna.v81n188.40042 ◽

2014 ◽

Vol 81 (188) ◽

pp. 52-59 ◽

Cited By ~ 1

Author(s):

Allex Eduardo Alvarez-Lugo ◽

Juan Sebastian Carvajal-Munoz

Keyword(s):

Computed Tomography ◽

Internal Structure ◽

Asphalt Mixtures ◽

X Ray ◽

Lessons Learnt ◽

X Ray Computed

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Microstructure characterization of cold in-place recycled asphalt mixtures by X-ray computed tomography

Construction and Building Materials ◽

10.1016/j.conbuildmat.2018.03.203 ◽

2018 ◽

Vol 171 ◽

pp. 969-976 ◽

Cited By ~ 12

Author(s):

Bin Yu ◽

Xingyu Gu ◽

Fujian Ni ◽

Lei Gao

Keyword(s):

Computed Tomography ◽

Microstructure Characterization ◽

Asphalt Mixtures ◽

Recycled Asphalt ◽

X Ray ◽

X Ray Computed

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Use of Imaging Techniques for Viewing the Internal Structure of Rubberised Asphalt Mixtures

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.695.8 ◽

2014 ◽

Vol 695 ◽

pp. 8-11 ◽

Cited By ~ 1

Author(s):

Norhidayah Abdul Hassan ◽

Gordon Airey ◽

Ramadhansyah Putra Jaya ◽

Mohd Zul Hanif Mahmud ◽

Nordiana Mashros

Keyword(s):

Computed Tomography ◽

Electron Microscope ◽

Internal Structure ◽

Imaging Techniques ◽

Asphalt Mixture ◽

Asphalt Mixtures ◽

X Ray ◽

X Ray Computed ◽

Rubberized Asphalt Mixture ◽

Scanning Electron

This paper presents the application of different imaging techniques for viewing the internal structure of rubberized asphalt mixture as road materials. Two imaging techniques were used to capture the internal structure images of its compacted samples i.e. X-ray Computed Tomography (non-destructive method) and Scanning Electron Microscope, SEM (destructive method). Since a lot of previous researchers have produced extensive works on the mechanical properties, therefore, this study is an attempt to introduce the microstructure of rubberized asphalt mixtures produced using dry process method. Two types of dry mixed rubberized asphalt mixture were prepared by modifying a Hot Rolled Asphalt Mixture (HRA 60/20) with different crumb rubber sizes. A mixture of conventional HRA 60/20 was also scanned for comparison. The illustrations are aimed to provide the researchers more information regarding their internal structure distribution.Keywords: Imaging techniques, X-ray Computed Tomography, Scanning Electron Microscope, Rubberised Asphalt Mixture

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