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The Mechanisms of Healing of Asphalt Pavement By DingXin Cheng For Dr. Lytton’s Micromechanics Class November 11, 2002
2 Outline Surface Free Energy Concept Fatigue and Healing Analysis Mechanical Testing Results Healing Mechanisms
3 Surface Free Energy
Measurement of Asphalt -Wilhelmy Plate
Measurement of Aggregate – Universal Sorption Device (USD)
6 lab field shift factor K 2f K 2I Log N f Log CALCULATED STRAIN Fatigue shift factor
7 Fatigue and Healing Model -(1) Fatigue model without rest period Where,
8 Fatigue and Healing Model -(2) Fatigue model considering the healing effect
9 Healing Curve
10 Short-Term Healing Rate vs. Non-Polar Component
11 Long-Term Healing Rate vs Polar Component
12 Summary of Effect of Surface Free Energy on Fracture Fatigue Healing Healing potential is promoted with Reduced LW Increased AB
LW and Healing Potential
AB and Healing Potential
15 Testing Results and Healing Analysis - Aging Effect
16 Asphalt Binder Fatigue Testing including Healing Effects
17 DMA Fatigue Data for AAM-1 NfNf
18 DMA Data Fatigue for AAD-1 NfNf
19 Asphalt Mixture Healing Testing -by Si, et al.
20 Result Comparison Table Healing Potential Level AAD-1AAM-1HCR Surface Energy LowMedianHigh Binder Fatigue Test LowMedianHigh Mixture Fatigue Test LowMedianHigh
21 Mechanisms of Healing
22 Acid-Base Components of Surface Energy - Acid-Base Intermolecular Force
23 Acid-Base Attracting Energy Potential Two Particles
24 Attracting Energy Potential of One Mole Material
25 Repulsion Due to Electron Orbital Overlap
26 Net Acid-Base Attraction Energy
27 Potential Energy of Acid-Base Interaction Versus Inter-particle Distances
28 Lifshitz-van der Waals Components London Dispersion Force Debye Induction Force Keesom Orientation Force
29 Net Lifshitz-van der Waals Potential Energy
30 Potential Energy of Lifshitz-van der Waals Interaction Versus Inter-particle Distances
31 Comparison of AB and LW Potential Energy Changing with Inter-particle Distances
32 Healing Mechanism Microcracking Van der WaalsAcid-Base Forces
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