Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios (2020) / Chapter Skim
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145 Chapter 6 presents a summary of the key findings from this study and suggests further research and implementation activities. 6.1 Summary The results from this study are presented in this report and organized with key results from Phase 1 and Phase 2 highlighted in Chapter 1 and Chapter 2, respectively.
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146 Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios The evaluation tools for binder blends and mixtures include aging protocols, recycling-agent blending methods, and laboratory tests and corresponding thresholds for adequate performance. Additional investigations of chemical compatibility of recycling agents with base and recycled binders and representative binder blending were also completed in Phase 2, and laboratory aging and climate effects were explored for both binder blends and mixtures.
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Key Findings Binder Blend Results Mortar Results Mixture Results PG & Δ T c G -R Pa ra m et er T δ = 45 ° SA R -A D , T g, T g E nd C A g A gi ng P re di ct io n PG & Δ T c C I B in de r C on te nt P b M R |E * | & G -R m FI S m , m -v al ue m N 12 .5 C R I E nv D R , G R vs N f Recycling-agent effectiveness must be characterized in high RBR binder blends or mixtures initially and with long-term aging to capture initial compatibility and rheological response to oxidation.
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Key Findings Binder Blend Results Mortar Results Mixture Results PG & Δ T c G -R Pa ra m et er T δ =4 5 SA R -A D , T g, T g En d C A g A gi ng P re di ct io n PG & Δ T c C I B in de r C on te nt P b M R |E * | & G -R m FI S m , m -v al ue m N 12 .5 C R I E nv D R , G R vs N f Adequate performance for high RBR mixtures with recycling agents can be controlled with proposed thresholds for N12.5, G-Rm, FI, Sm and m-valuem, and CRIEnv.
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Summary and Path Forward 149 properties of viscoelastic materials (such as fracture properties) can be shifted by the LVE time–temperature superposition principles provided that the same molecular motions govern both LVE and fracture properties (Tabatabaee et al.
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150 Evaluating the Effects of Recycling Agents on Asphalt Mixtures with High RAS and RAP Binder Ratios 6.2.2 Suggested Implementation Activities Ideas for suggested implementation activities generated to apply the results of this study include the following: • Field Demonstration Project: Unfortunately, the majority of the field projects in this study used significantly lower recycling-agent doses than those selected to match continuous PGH for the target climate. Thus, a field demonstration project with a recycling-agent dose selected by the method developed in this study is needed for validation of the evaluation tools also developed in this study.
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