1 Characterization of Damage Resistance to Rutting Using IPAS 2 Software Pouya Teymourpour, Hussain Bahia ARC Deliverables/Products Presentation and Workshop TRB 2015, Thursday, January 15, 2015 Marriott Marquis, Washington DC. Work completed with the generous help of Dr. Nima Roohi Sefidmazgi Dr. Raul Velasquez Dr. Aaron Coenen Funding supported by Federal Highway Administration (FHWA) Acknowledgements
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ARC Workshop iPas UW · 5 Can we measure aggregate structure? iPas2 (Image analysis and processing software) •iPas2 is tool to identify aggregate proximity during and after compaction.
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Characterization of Damage Resistance to Rutting Using IPAS2 Software
Pouya Teymourpour, Hussain Bahia
ARC Deliverables/Products Presentation and Workshop
TRB 2015, Thursday, January 15, 2015Marriott Marquis, Washington DC.
Work completed with the generous help of
Dr. Nima Roohi Sefidmazgi
Dr. Raul Velasquez
Dr. Aaron Coenen
Funding supported by Federal Highway Administration (FHWA)
Acknowledgements
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Outline• Overview
• Background– Aggregate structure role in Asphalt Concrete (AC) performance
– Imaging methods in AC characterization
• iPas2
• Internal structure analysis– Aggregate structure and rutting performance
– Factors affecting aggregate structure Gradation
Binder rheology
Compaction conditions on
• Conclusions and future work
Aggregate structure role in AC performance
•Rutting mechanisms:– Densification ( V 0
– Shearing ( V 0
•Current mix design procedures: target density
Depending on Aggregate interlock
Flow Number at Equal Density
SampleStress (kPa)
= 1034% AV
Coarse Mix 210 7Fine Mix 400 7
Almost 100% difference
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Image analysis of AC:Background
•Yue et al. 1995: Primary indices, major and minor axis, orientation
•Masad et al. 1998: Efficiency of 2D analysis, concept of anisotropy (
•Masad et al. 1999: Introduced X-ray computed tomography, initial method of contact characterization
•Tashman et al. 2001, 2007: Characterized asphalt mixtures based on air void distribution, aggregate orientation, segregation
•Zelew and Papagiannakis (2009, 2011) : focused on automation of processing and analysis
However, there is no agreement on how to quantify
and describe aggregates’ structure
Evaluating Performance - Rutting
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Flow Number (Rutting) vs. Density
Density ≠ Performance
Defining Aggregate Structure
AC Rutting Performance
?per area
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Can we measure aggregate structure?iPas2 (Image analysis and processing software)
• iPas2 is tool to identify aggregate proximity during and aftercompaction.
• Outputs:– Packing– Connectivity– Orientation– Spatial Distribution
Introduction
• iPas : Image Processing and Analysis System
• Two components:– Image Processing Filters
Enhancing
Result: Black and White Image
– Microstructure Analysis Area Fraction
Gradation
Other Micromechanical Characteristics> Proximity zones, total proximity length, contact orientation, aggregate
orientation, segregation
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iPas overviewStep 1 -Image processing
Original image Median Filtered Hmax Filtered
After watershed transform After thresholding
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Labeled image
After Coenen et al. 2011
iPas overviewStep 2- Microstructure analysis
G1
G2
G3
Segregation Orientation Number of proximity zones
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New approach for aggregate skeleton characterization: iPas2
Proximity zones Proximity length
New approach for aggregate skeleton characterization: iPas2
Performance
No. of Contact zones
Contact length
Contact orientation
Skeleton
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Example 1: Effect of aggregate Gradation on Rutting