Asphalt Binder Extraction Protocol for Determining Amount & PG Characteristics of Binders Recovered from Asphalt Mixtures
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2018-03-01
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Edition:FINAL REPORT
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NTL Classification:NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance
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Abstract:Accurate determination of asphalt content is critical to ensuring the quality of asphalt mixes used in Wisconsin’s road projects. The two most-common methods for determining asphalt content are the American Association of State Highway and Transportation Officials (AASHTO) solvent extraction and ignition tests. These procedures are well established; however, their accuracies are sensitive to variations in materials and high recycled binder content mixes commonly used in Wisconsin. Therefore, an evaluation is needed to assess within-lab and between-lab testing variability. The main objectives of this research were to evaluate solvent extraction, ignition and asphalt analyzer test procedures; determine tolerances between methods; and modify WisDOT material and mix standards. The research team also evaluated the variability of the performance grade (PG) properties of extracted binder after recovery.
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