Three Dimensional Digital Sieving of Asphalt Mixture Based on X-ray Computed Tomography

In order to perform three-dimensional digital sieving based on X-ray computed tomography images, the definition of digital sieve size (DSS) was proposed, which was defined as the minimum length of the minimum bounding squares of all possible orthographic projections of an aggregate. The correspondin...

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Bibliographic Details
Published in:Applied sciences 2017-07, Vol.7 (7), p.734
Main Authors: Hu, Chichun, Ma, Jiexian, Kutay, M.
Format: Article
Language:English
Subjects:
aggregate gradation
Aggregates
Asphalt
Asphalt mixes
asphalt mixture
Calibration
Computed tomography
Digital imaging
image processing
Laboratories
Orthography
Sieve analysis
Stone mastic asphalt
X-ray computed tomography
X-rays
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Summary:In order to perform three-dimensional digital sieving based on X-ray computed tomography images, the definition of digital sieve size (DSS) was proposed, which was defined as the minimum length of the minimum bounding squares of all possible orthographic projections of an aggregate. The corresponding program was developed to reconstruct aggregate structure and to obtain DSS. Laboratory experiments consisting of epoxy-filled aggregate specimens were conducted to investigate the difference between mechanical sieve analysis and the digital sieving technique. It was suggested that concave surface of aggregate was the possible reason for the disparity between DSS and mechanical sieve size. A comparison between DSS and equivalent diameter was also performed. Moreover, the digital sieving technique was adopted to evaluate the gradation of stone mastic asphalt mixtures. The results showed that the closest proximity of the laboratory gradation curve was achieved by calibrated DSS, among gradation curves based on calibrated DSS, un-calibrated DSS and equivalent diameter.
ISSN:2076-3417
2076-3417
DOI:10.3390/app7070734