Effect of recycling agents in recycled asphalt binders observed with microstructural and rheological tests

Ilaria Menapace, Lorena Garcia Cucalon, Fawaz Kaseer, Edith Arámbula-Mercado, Amy Epps Martin, Eyad Masad, Gayle King

Research output: Contribution to journalArticle

21 Citations (Scopus)


In this study, the effect of recycling agents on recycled blends obtained from base and recycled asphalt binders and the performance of the rejuvenated binders with aging was investigated by means of Atomic Force Microscopy (AFM) and Dynamic Shear Rheometer (DSR). This study arises as the amount of recycled materials in asphalt pavements continues to increase. Recycled binders are significantly stiffer than base binders; however, the performance grade can be restored by inclusion of recycling agents. Nevertheless, intermediate temperature cracking performance evaluated by the Glover-Rowe (G-R) parameter indicated that the effect of the recycling agents is not sustained with subsequent aging, which could jeopardize its effectiveness in service. The AFM images provided microstructural information, which offer indications about changes in molecular mobility and degree of association with aging, presence of agglomerations, and the dispersive effect of recycling agents.

Original languageEnglish
Pages (from-to)61-74
Number of pages14
JournalConstruction and Building Materials
Publication statusPublished - 15 Jan 2018



  • Atomic Force Microscopy
  • Glover-Rowe parameter
  • Microstructure
  • Reclaimed asphalt pavement
  • Recycled asphalt shingle
  • Recycling agent
  • Rejuvenator
  • Rheology

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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