Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction: Phase III Results (2021) / Chapter Skim
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5 Selection of Aging Index Properties The development of the laboratory aging procedure and PAM that was undertaken during the original NCHRP Project 09-54 hinged on the comparison of key aging index properties (AIPs) of laboratory-aged binders and binders extracted and recovered from field cores.
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6 Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction: Phase III Results effective rheological AIP evaluated, as the other rheological indices required fitting master curve and time-temperature shift (tTS) factor models to the rheological data coupled with subjective interpolation and extrapolation.
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Previous Research Conducted Under the Original NCHRP Project 09-54 7 AIP rather than C+S absorbance peaks. A rheological AIP was selected for the kinetics model because rheology is related more directly to performance than chemical AIPs.
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8 Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction: Phase III Results the following observations: first, the relationship between log |G* | and aging under isothermal conditions that reflect pavement temperatures is relatively linear; second, the values of kf and kc in Equations (2)
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Previous Research Conducted Under the Original NCHRP Project 09-54 9 history data at different depths obtained from the EICM for eight projects located in various climatic regions within the United States.
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10 Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction: Phase III Results was still not considered in the sense that the partial pressure of the oxygen that is available to the binder, which is influenced by the mixture's morphological properties, varies with depth; this is not manifested in the kinetics model. Therefore, additional work was needed to finalize the PAM.
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Previous Research Conducted Under the Original NCHRP Project 09-54 11 followed by long-term aging in the same oven at 95°C. The evolution of log |G*
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12 Long-Term Aging of Asphalt Mixtures for Performance Testing and Prediction: Phase III Results Aging Duration (Days) Aging Duration (Days)
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Previous Research Conducted Under the Original NCHRP Project 09-54 13 to obtain the evolution of log |G* | for the loose mix using USAT binder results.
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