Mechanical and Microstructural Properties of Asphalt Binders Containing Various Proportions of Reclaimed Asphalt Pavement (RAP)

K. Lakshmi Roja*, Wubulikasimu Yiming, Eyad Masad

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)

Abstract

This study aims to characterize the mechanical and microstructural properties of asphalt binders prepared with 25 and 35% of RAP contents. A base binder of pen 60/70 (PG 64-22) was used in this study. The binders were characterized by conducting performance grading, multiple stress creep recovery, and frequency sweep tests. The performance of RAP blended binders were compared with the control binder. In addition, microstructural investigation was carried out using an atomic force microscope (AFM) to evaluate the mixing and adhesion between the conventional and recycled binder. From the rheological studies, the dynamic modulus of binder increased with an increase in RAP proportion. The binder testing results showed higher rut resistance characteristics for 35% RAP binder compared to 25% RAP and control binders. In microscopic studies, as the proportion of RAP increased from 0 to 35%, the surface roughness increased and the phase contrast decreased. The results of this study would be of value to the highway authorities and contractors as they move towards adopting more RAP material in the construction of asphalt pavements.

Original languageEnglish
Title of host publicationAirfield and Highway Pavements 2019
Subtitle of host publicationTesting and Characterization of Pavement Materials - Selected Papers from the International Airfield and Highway Pavements Conference 2019
EditorsImad L. Al-Qadi, Hasan Ozer, Andreas Loizos, Scott Murrell
PublisherAmerican Society of Civil Engineers (ASCE)
Pages295-301
Number of pages7
ISBN (Electronic)9780784482469
DOIs
Publication statusPublished - 2019
Externally publishedYes
EventInternational Airfield and Highway Pavements Conference 2019: Testing and Characterization of Pavement Materials - Chicago, United States
Duration: 21 Jul 201924 Jul 2019

Publication series

NameAirfield and Highway Pavements 2019: Testing and Characterization of Pavement Materials - Selected Papers from the International Airfield and Highway Pavements Conference 2019

Conference

ConferenceInternational Airfield and Highway Pavements Conference 2019: Testing and Characterization of Pavement Materials
Country/TerritoryUnited States
CityChicago
Period21/07/1924/07/19

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