Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios (2020) / Chapter Skim
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From page 261... ...
I-1 A P P E N D I X I Draft AASHTO Standard Practice Proposed Standard Practice for Characterization of Asphalt Mixtures with High Recycled Materials Contents and Recycling Agents AASHTO Designation: R XX-XX 1. SCOPE 1.1 This practice describes practical tools to evaluate the effectiveness of recycling agents (rejuvenators)
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I-2 Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios • T 315-12, Determining the Rheological Properties of Asphalt Binder Using a Dynamic Shear Rheometer (DSR) • T 313-12, Determining the Flexural Creep Stiffness of Asphalt Binder Using the Bending Beam Rheometer (BBR)
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Draft AASHTO Standard Practice I-3 3.5 Dynamic modulus – |E* |, the absolute value of the complex modulus calculated by dividing the peak-to-peak stress by the peak-to-peak strain for a material subjected to a sinusoidal loading.
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I-4 Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios 3.18 Recycled asphalt shingles – RAS, manufactured shingle waste or post-consumer asphalt shingle that has been processed into a recyclable material. 3.19 Recycled binder blend, for the purposes of this specification, shall mean the mixture of base binder and RAP/RAS binders.
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Draft AASHTO Standard Practice I-5 7. BINDER BLEND PREPARATION 7.1 Select the base binder content, RAP and/or RAS binder content, and recycling agent dose.
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I-6 Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios 8. ASPHALT MIXTURE SPECIMEN PREPARATION 8.1 Select the base binder content, RAP and/or RAS content, recycling agent dose, and aggregate gradation.
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Draft AASHTO Standard Practice I-7 metal wire mesh secured with clamps to avoid geometry distortion and preserve their integrity.
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I-8 Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios rate of reduction in PGH per 1% recycling agent dose. For petroleum-based aromatic extracts, a rate of reduction in PGH per 1% recycling agent dose of 1.38 is recommended.
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Draft AASHTO Standard Practice I-9 Dose -- - -- - -- - < 8-10%c a Original binder and RTFO aged by AASHTO T 240 b 20-hour PAV aging @ 100°C by AASHTO R 28 c Percent of total binder in the blend/mixture 11. BINDER BLEND RHEOLOGICAL EVALUATION TOOLS 11.1 Table 2 provides binder blend evaluation tools for use with high RBRs and recycling agents.
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I-10 Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios Table 3 -- Mixture Evaluation Tools for Use with High RBRs and Recycling Agents. Test Parameter Suggested Performance Threshold High Temperature, Short-Term Aging HWTT or APA N12.5 > 5,000 for PG 58-XX > 7,500 for PG 64-XX in cold climate > 10,000 for PG 64-XX in warm climate > 15,000 for PG 70-XX Intermediate Temperature, Track with Aging |E*
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Draft AASHTO Standard Practice I-11 RAP BAF = -0.014 × PGHRAP + 1.898 (3)
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I-12 Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios 16.1 Epps Martin, A., F Kaseer, E
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Abbreviations and acronyms used without definitions in TRB publications: A4A Airlines for America AAAE American Association of Airport Executives AASHO American Association of State Highway Officials AASHTO American Association of State Highway and Transportation Officials ACI–NA Airports Council International–North America ACRP Airport Cooperative Research Program ADA Americans with Disabilities Act APTA American Public Transportation Association ASCE American Society of Civil Engineers ASME American Society of Mechanical Engineers ASTM American Society for Testing and Materials ATA American Trucking Associations CTAA Community Transportation Association of America CTBSSP Commercial Truck and Bus Safety Synthesis Program DHS Department of Homeland Security DOE Department of Energy EPA Environmental Protection Agency FAA Federal Aviation Administration FAST Fixing America's Surface Transportation Act (2015) FHWA Federal Highway Administration FMCSA Federal Motor Carrier Safety Administration FRA Federal Railroad Administration FTA Federal Transit Administration HMCRP Hazardous Materials Cooperative Research Program IEEE Institute of Electrical and Electronics Engineers ISTEA Intermodal Surface Transportation Efficiency Act of 1991 ITE Institute of Transportation Engineers MAP-21 Moving Ahead for Progress in the 21st Century Act (2012)
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TRA N SPO RTATIO N RESEA RCH BO A RD 500 Fifth Street, N W W ashington, D C 20001 A D D RESS SERV ICE REQ U ESTED ISBN 978-0-309-48104-5 9 7 8 0 3 0 9 4 8 1 0 4 5 9 0 0 0 0 N O N -PR O FIT O R G .
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