Asphalt Binder Aging Methods to Accurately Reflect Mixture Aging (2021) / Chapter Skim
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Pages 166-170
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From page 166... ...
166 Conclusions Short-Term Conditioning The research concerning short-term binder conditioning conducted in NCHRP Project 09-61 included the following: 1. A critical evaluation of AASHTO T 240, 2.
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From page 167... ...
Conclusions and Recommendations 167 from binder recovered from short-term conditioned loose mixtures. However, the ratio of the AASHTO T 240 aging index to the recovered loose mix conditioned aging index was not a function of the viscosity of the binder at the conditioning temperature, indicating the bias could be eliminated by increasing the conditioning temperature above 135°C or increasing the conditioning time.
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From page 168... ...
168 Asphalt Binder Aging Methods to Accurately Reflect Mixture Aging of conditioning using a mass of 50.0 g. Both are approximately equivalent to 10 years of field aging at a depth of 0.75 in for the pavements at the Arizona and Minnesota sites.
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From page 169... ...
Conclusions and Recommendations 169 Conditioning for Revised Performance Grading Criteria The greatest potential use of the research from this project is in conjunction with changes to binder performance grading criteria that account for the additional aging simulated by 12.5 g, 20-hr, 2.1 MPa long-term PAV conditioning. The 12.5 g, 20-hr, 2.1 MPa PAV conditioning temperatures as a function of climate recommended from the NCHRP Project 09-61 research simulate near-surface aging after 10 years in service.
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From page 170... ...
170 Asphalt Binder Aging Methods to Accurately Reflect Mixture Aging 4. Implementation of the suggestions in the Proposed AASHTO Practice, 0.8 mm Static Film Short- and Long-Term Conditioning of Asphalt Binder will require the development of a new oven with accurate temperature and pressure control for performing the short-term conditioning.
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