The Mechanisms of Healing of Asphalt Pavement By DingXin Cheng For Dr. Lytton’s Micromechanics Class November 11, 2002.

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Presentation transcript:

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 NfNf

18 DMA Data Fatigue for AAD-1 NfNf

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

33