Angularity is one of the important aggregate properties contributing to the permanent deformation resistance of asphalt mixtures. Therefore, methods that are able to rapidly and accurately describe aggregate angularity are valuable in the design process of asphalt mixtures. Two computer-automated procedures, which make use of the advances in digital-image processing, to quantify fine aggregate angularity, are presented. The first method relies on the concepts of the erosion-dilation techniques. This consists of subjecting the aggregate surface to a smoothing effect that causes the angularity elements to disappear from the image. Then, the area lost as a result of the smoothing effect is calculated and used to quantify angularity. The second method is based on the fractal approach. Image-analysis techniques are used to measure the fractal length of aggregate boundary. The fractal length increases with aggregate angularity. The proposed imaging techniques are used to capture the aggregate angularity of 23 sand samples that represent a wide range of materials. The results are compared with visual analysis and indirect methods of measuring fine-aggregate angularity, such as the uncompacted air voids, and the angle of internal friction of aggregate mass. In general, the results indicate much promise for measuring aggregate properties using automated imaging technologies.
Fine-Aggregate Angularity: Automated Image Analysis Approach
Transportation Research Record
Transportation Research Record: Journal of the Transportation Research Board ; 1721 , 1 ; 66-72
2000-01-01
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
PART 3 -- AGGREGATE TESTS - Fine-Aggregate Angularity: Automated Image Analysis Approach
Online Contents | 2000
|Evaluation of Fine Aggregate Angularity Using National Aggregate Association Flow Test
Online Contents | 1994
|Quantification of Coarse Aggregate Angularity Based on Image Analysis
Transportation Research Record | 2002
|Comparing Fine Aggregate Angularity with Aggregate and Hot-Mix Asphalt Performance Tests
Transportation Research Record | 2006
|Investigation of Superpave Fine Aggregate Angularity Criterion for Asphalt Concrete
Transportation Research Record | 2007
|