01476364

Component

https://doi.org/10.3141/2335-06

http://scholar.google.com...huja&publication_year=2013

Morphological properties of mineral aggregates are known to affect pavement and railroad track mechanistic behavior and performance significantly in relation to strength, modulus, and permanent deformation. With imaging technology, an objective and accurate measurement of aggregate particle size and shape properties can be obtained in a rapid, reliable, and automated fashion. But these advances in aggregate imaging must be brought to project sites and quarries in the field. This paper introduces field image-acquisition and image-processing techniques for extraction and analyses of size and shape properties of individual aggregate particles. Referred to as segmentation techniques, image-processing methods developed in this study analyzed two-dimensional field images of aggregates captured by a digital single-lens reflex camera. The segmented aggregate images were fed into the validated University of Illinois aggregate image analyzer to quantify particle size and shape properties by means of its image-processing algorithms for flat-and-elongated ratio, angularity index, and surface texture index. The developed method successfully determined the properties of coarse-aggregate samples collected from various depths in a layer of railroad track ballast. The promising preliminary results indicate that these segmentation techniques could be considered in the field for capturing several aggregate particles rapidly and reliably in a single image so that (a) size and shape properties of individual particles could be analyzed and (b) both spatial property variability and property changes with layer depth and usage (i.e., property degradation in time) could be evaluated under service loading.

01490600

13-4167

English

pp 50–59

2013

Transportation Research Record: Journal of the Transportation Research Board

9780309263320

Print

Figures (7) ; Photos; References (26) ; Tables (3)

Ballast (Railroads); Case studies; Field tests; Image analysis; Image processing; Machine vision; Mineral aggregates; Pavement performance; Shape; Texture

Geotechnology; Highways; Materials; Pavements; Railroads; I36: Aggregates

PRP, TRIS, TRB, ATRI

Feb 5 2013 12:48PM

• Analytical and Laser Scanning Techniques to Determine Shape Properties of Aggregates
• Assessing Soil Stiffness of Stabilized Pavement Foundations
• Assessment of Scour on Bridge Foundations by Means of In Situ Erosion Evaluation Probe
• Blast Furnace Slag as Sustainable Material in Concrete Pavements
• Durability Assessment of Coarse Aggregates for Hot-Mix Asphalt in Maine
• Evaluating Laboratory Compaction Techniques of Reclaimed Asphalt Pavement
• Evaluation of Aggregate Imaging Techniques for Quantification of Morphological Characteristics
• Guidelines for Selection and Use of Coarse Recycled-Concrete Aggregates in Structural Concrete
• Improving Properties of Reclaimed Asphalt Pavement for Roadway Base Applications Through Blending and Chemical Stabilization
• Measuring Shear Wave Velocity in Laboratory to Link Small- and Large-Strain Behavior of Soils
• Microstructural Analysis for Mechanical Behavior of Granular Waste Materials
• Moisture-Sensitive and Stress-Dependent Behavior of Unbound Pavement Materials from In Situ Falling Weight Deflectometer Tests