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October 13, 2017Road Materials and Pavement Design

Characterising the long-term rejuvenating effectiveness of recycling agents on asphalt blends and mixtures with high RAP and RAS contents

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Authors

FYFan YinFKFawaz KaseerEAEdith Arámbula

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Overview

Laboratory investigation reveals recycling agents improve cracking resistance in high-content recycled asphalt, indicating viable durability despite diminishing rejuvenation over long-term aging.

Key Points

  • Characterize the long-term rejuvenating effectiveness of recycling agents on asphalt blends and mixtures incorporating high proportions of reclaimed asphalt pavement and recycled asphalt shingles.
  • Formulated asphalt blends and mixtures using materials from two field projects with diverse combinations of base binder, recycling agents, and high reclaimed pavement and shingle contents.
  • Subjected blends and mixtures to multiple laboratory aging protocols, including loose mix aging at 135°C for 1 day, compacted specimen aging at 85°C for 5 days, rolling thin film oven aging, and up to 40 hours of pressure aging vessel exposure.
  • Assessed performance across aging levels by measuring binder oxidation kinetics, rheological properties, and mixture cracking resistance.
  • Recycling agents partially restored the mechanical and rheological properties of recycled binders, achieving cracking resistance equal to or exceeding agency-specified mixtures without additives, although restorative efficacy declined with aging.
  • Addition of recycling agents exhibited no significant impact on the oxidation kinetics of recycled blends but increased binder susceptibility to oxidation-induced physical hardening.
  • Mixture aging protocols of 5 days at 85°C on compacted specimens and 1 day at 135°C on loose mix yielded binder rheology corresponding to rolling thin film oven treatment plus approximately 10 and 40 hours of pressure aging vessel conditioning, respectively.

Cite This Study

Yin et al. (2017) studied this question.

synapsesocial.com/papers/69f758d35d729d8d22c16459https://doi.org/10.1080/14680629.2017.1389074
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