Determining Aggregate Determining Aggregate Characteristics of HMA: Characteristics of HMA: 3D Processing of X 3D Processing of X - - ray CT Images ray CT Images M. Emin Kutay, Ph.D. M. Emin Kutay, Ph.D. Asphalt Mixture Scientist / Lab Manager Asphalt Mixture Scientist / Lab Manager Turner Turner - - Fairbank Highway Research Center Fairbank Highway Research Center [email protected][email protected]Acknowledgements: Acknowledgements: Nelson Gibson, Ph.D. Nelson Gibson, Ph.D. Jack Youtcheff, Ph.D. Jack Youtcheff, Ph.D. Rick Meininger, P.E. Rick Meininger, P.E. Edith Arambula, Ph.D. Edith Arambula, Ph.D.
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Determining Aggregate Characteristics of HMA: 3D ...X-ray CT imaging Rigorous image processing & analysis Separation of aggregates Individual aggregate props: 3D orientation, angularity,
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Determining Aggregate Determining Aggregate Characteristics of HMA: Characteristics of HMA:
3D Processing of X3D Processing of X--ray CT Images ray CT Images
M. Emin Kutay, Ph.D.M. Emin Kutay, Ph.D.Asphalt Mixture Scientist / Lab ManagerAsphalt Mixture Scientist / Lab ManagerTurnerTurner--Fairbank Highway Research CenterFairbank Highway Research Center
Effect of aggregate propertiesEffect of aggregate properties
•• Fine Fine graded HMA mixgraded HMA mix–– CoarseCoarse AggrAggr: Little or no contact points: Little or no contact points–– FineFine AggrAggr: Very important: Very important
•• Coarse Coarse graded HMA mixgraded HMA mix–– CoarseCoarse AggrAggr: Some contact points: Some contact points–– FineFine AggrAggr: Important: Important
•• SMA SMA MixMix–– CoarseCoarse AggrAggr: Many contact points: Many contact points–– FineFine AggrAggr: Less important: Less important
Steps of ImageSteps of Image--based Aggregate Extractionbased Aggregate Extraction
Individual aggregate props:Individual aggregate props:3D orientation, angularity, 3D orientation, angularity, Specific surface area Specific surface area ……etc.etc.
Calculation of contact Calculation of contact pointspoints