Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction (2017) / Chapter Skim
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From page 12... ...
12 Overview of Research Approach This section briefly explains the research approach. Figure 2 presents a flow chart to describe the research plan.
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Research Approach 13 to evaluate the significance of observed differences in asphalt binder AIPs in terms of asphalt mixture performance. To accomplish this goal, experimental characterization was performed at multiple length scales, i.e., asphalt binder, asphalt mastic, and asphalt fine aggregate matrix (FAM)
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14 Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction After oxidizing the asphalt, it was either tested directly, blended with filler particles to create mastic, which was then tested, or blended with filler and fine aggregate to create FAM, which was then tested. The testing consisted of temperature and frequency sweep tests to establish the dynamic modulus values of the materials and time sweep tests to establish the fatigue properties of the materials.
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Research Approach 15 comparisons of extracted and recovered asphalt binder AIPs following long-term aging. Damage induced by the application and release of pressure to the compacted specimens also was assessed.
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16 Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction a separate set of mixtures. The validated kinetics model provides a basis for the future development of a methodology that integrates the effects of long-term aging on performance in Pavement ME Design and other mechanistic design and analysis methods.
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Research Approach 17 study. The PG 64-22 binder and granite aggregate were acquired from North Carolina and used in the sensitivity study and for the evaluation of candidate aging methods.
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18 Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction FAM Preparation The compositional design was developed for FAM based on the mixture design for each source. The maximum specific gravity, Gmm, was calculated at the aging level of 0 year.
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Research Approach 19 Asphalt Mixture Aging All of the asphalt mixtures aged in the laboratory were prepared using component materials that were used in constructing the pavements from which field cores were obtained. All of the component materials were prepared based on the original mix design.
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20 Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction nominal maximum aggregate size (NMAS) of the aged mix, as shown in Figure 8.
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Research Approach 21 set-up. The loose mix was dispersed in thin layers, consistent with the process for oven aging.
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22 Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction PAV Asphalt binder residue obtained from the RTFO aging was subjected to PAV aging based on AASHTO R 28 at 100°C for 20 hours. USAT The USAT, developed by Farrar et al.
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Research Approach 23 Test Methods Asphalt Binders FTIR Test Procedure ATR FTIR spectroscopy collects absorbance data within a wide spectral range (400 cm-1 to 4000 cm-1)
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