Image-Based Coarse-Aggregate Angularity Analysis and Evaluation
Publication: Journal of Materials in Civil Engineering
Volume 32, Issue 6
Abstract
The angularity of coarse aggregates significantly influences the performance of asphalt pavement. However, the research remains in the qualitative stage, and no universal evaluation standard has been proposed. This research proposes image-based methods to quantitatively analyze the angularity of coarse aggregates, thereby providing corresponding evaluation standards. First, aggregate levels of 4.75–9.5, 9.5–13.2, and 13.2–16 mm were obtained by sieving experiments, which were then abraded 0, 400, 800, and 1,200 times using a Los Angeles abrasion machine. Subsequently, the aggregate particle angularity parameters, including circumference, area, convex hull circumference, convex hull area, and total number of corner points, were calculated. Meanwhile, the aggregate imaging system (AIMS) gradient, skeleton extraction, convex hull, and uncompacted void content (UVC) methods were used to evaluate the angularities of the aggregates. Thereafter, the AC-13C-type mixture test specimens were formed using different angularity aggregates. On this basis, the angularity-related pavement skid resistance and rut resistance tests were conducted. The results show that the skeleton extraction method performs excellently for evaluating all aggregate levels, while the convex hull method is suitable for 9.5- and 13.2-mm aggregates, the AIMS gradient method is suitable for assessing 4.75- and 9.5-mm aggregates, and the UVC method is suitable for assessing 9.5- and 13.2-mm aggregates.
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Data Availability Statement
The source data, models, or code are supposed to be optimized with respect to current versions of the developed models to improve their limitations. Some of the data, models, or code generated or used during the study are available from the corresponding author by request. Moreover, the demo code and the raw data of this paper can be found from the GitHub repository: https://github.com/juhuyan/aggregate-angularity-analysis.
Acknowledgments
This research is funded by National Natural Science Foundation of China (Grant No. 51978071) and Fundamental Research Funds for the Central Universities, Chang’An University (Grant Nos. 300102249301, 300102249306), China. This research is also supported by the Norman W. McLeod Chair in Sustainable Pavement Engineering, Centre for Pavement and Transportation Technology (CPATT), University of Waterloo, Waterloo, Ontario, Canada. Therefore, they are highly acknowledged. The authors would also like to express thanks to the anonymous reviewers for providing valuable comments.
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©2020 American Society of Civil Engineers.
History
Received: Apr 8, 2019
Accepted: Oct 7, 2019
Published online: Mar 27, 2020
Published in print: Jun 1, 2020
Discussion open until: Aug 27, 2020
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