Investigation of Short-Term Laboratory Aging of Neat and Modified Asphalt Binders (2011) / Chapter Skim
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The general approach adopted for NCHRP Project 9-36 was to improve existing technologies rather than develop a completely new aging procedure. The project started with a review of existing binder aging procedures to identify viable candidate methods for possible improvement.
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This finding led to an extensive optimization study to establish operating parameters appropriate for the commercial SAFT. Operating parameters for impeller speed, airflow rate, and aging time were developed to provide a residue that best approximated the rheological properties of the RTFOT residue for PG 58-XX binders.
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The RTFOT Verification Experiment included comparisons of high-temperature continuous grades, master curve parameters, and aging indices for SAFT and MGRF residues to those for RTFOT residues. These comparisons showed that the MGRF and RTFOT provided similar aging.
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Consideration also should be given to conducting a formal ruggedness test for the current MGRF procedure to identify appropriate tolerance for the testing conditions. Factors that should be considered include bath temperature, rotational speed, flask submersion depth, airflow rate, flask angle, binder quantity, duration, and the need for a bath cover to better control temperature.
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