Nanotechnology. January 18, Principal Researchers: Troy Pauli, William Grimes, Julie Miller, James Beiswenger.
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1 Nanotechnology Presented by Troy Pauli Prepared for Federal Highway Administration Project Review Contract No. DTFH61-07-D Fundamental Properties of Asphalts and Modified Asphalts, III Washington, DC January 18, 2008 Principal Researchers: Troy Pauli, William Grimes, Julie Miller, James Beiswenger
2 Nanotechnology Hypothesis: Mechanisms of phase separation of asphalt components contribute to fatigue cracking and healing
3 Atomic Force Microscopy, AFM AFM with heating-cooling solidification sample stage
4 2008 Federal Highway Administration Project Review Nano Thin-film Chromatography
5 AAD-1 Spinodal-Blend Thin-Film Optical Microscope Image Crazing patterns
6 AFM Phase and Topography Images AAD-1 Spinodal-Blend Thin-Film
7 AFM Phase and Topography Images AAD-1 Spinodal-Blend Thin-Film
8 AFM Phase Image, AAF-1 IEC Neutral Fraction Crazing patterns?
9 Visual Example of Self-healing in a Model Asphalt-Polymer Mastic System?
10 H + CO2 HO k + CO Energy HO + CO H + CO2 Reaction Coordinate
11 Gibbs Free Energy for Reaction to Occur, ΔG ΔG = ΔH TΔS Energy Reaction Coordinate
12 ΔG = ΔH TΔS ΔG = ΔH TΔS ΔH = E a RT Energy Activation Energy Reaction Coordinate
13 Aging Index Plots
14 [ CO] 2008 Federal Highway Administration Project Review ln( ΔG*) dy = P rev + dx Absorbance Aging Index vs. Reversible State of Peptization y 0
15 Activation Energies vs. Change in Healing Index dh Ea( rest) Eb( rest) Ea( rest) Eb( rest) = Ea( rest) Ea( rest) 0
16 Reversible State of Peptization vs. Change in Healing Index P rev dy = dh + dx y 0
17 Activation Energy of Viscous Flow, Ea, kcal/mol η * dy Ea RTln Tfracture + y A dx Activation Energy vs. Fracture Temperature 0 y = x R 2 = Fractor Temperature, T fracture C 30.00
18 Moisture Resistance Experiment Sample cast on glass slide Beaker of water
19 Five-Week Water-Soaked Films
20 Five-Week Water-Soaked Films AAB-1 AAK-1
21 SHRP Asphalt AAK-1 After H 2 O Soak
22 SHRP Asphalt AAK-1 After H 2 O Soak
23 SHRP Asphalt AAF-1 After H2O Soak
24 SHRP Asphalt AAG-1 After H2O Soak
25 SHRP Asphalt AAA-1 After H2O Soak Blister?
26 Surface Tension, γ dynes/cm H 2008 Federal Highway Administration Project Review H H H H 140 H # of C vs alkanes H # of C vs alicyclic chains H # of C vs aromatic chains 120 H H # of C vs ketones # of C vs aromatic sheets H H # of C vs asphalt AMS predicted-alkanes 100 predicted-aromatics predicted-cyclics # of C vs alicyclic sheets 80 # of C vs asphalt NMR # of C vs asphalt AFM γh 2 O Organic Compound Type as Function of Surface Free Energy Number of Carbon Atoms in Molecule
27 Deposition-AFT (Automated Flocculation Titrimetry) Effective Molar Concentration, [c eff, mol/l] t i t "Floc Formation" t i < t rxn < t Reaction Time, t (seconds)
28 Deposition-AFT (Automated Flocculation Titrimetry)
29 Deposition-AFT Data Effective Molar Concentration,[c, (mol/l)] (Iso-Octane Asphaltenes) Δ[c] [c] initial [c] dep Titrant Delivery Time, t constant titrant flow rate addition AAA-1 AAB-1 AAC-1 AAD-1 AAF-1 AAG-1 AAK-1 AAM-1
30 Conclusions Cracking and healing processes have been modeled based on transition state theory. Aging index correlates with reversible state of peptization (i.e., colloidal-like structure of asphalt model). Activation energies, (i.e., flow (stiffness)/temp slope) of SHRP asphalts correlate with fracture temperature and change in healing index. Moisture damage (i.e., thin-film water soak) in model asphalt-mastic systems correlate with polyaromatic hydrocarbon concentration. Deposition-AFT data predict moisture damage in model systems.
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