Direct Characterization of Aging Diffusion in Asphalt Mixtures Using Micro-Indentation and Relaxation (MIR)

M. Alsalihi, A. Hosseini, A. Faheem

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

7 Scopus citations

Abstract

This study serves as proof of concept for using mixture micro indentation and relaxation (MIR) and possible means of capturing mastic rheological properties in place without binder extraction and recovery. This is achieved via analysis of stress relaxation behavior of samples under constant indentation depth on laboratory fabricated mixture samples. For laboratory compacted samples, indentation is applied on mastic within the mix in the radial direction to explore the aging gradient. The results show significant difference in stiffness of mastic depending on location from the surface. Air content in the mix also appears to be a key factor influencing aging diffusion. The results prove the ability of this testing approach to capture rheological properties of asphalt binders within the mix directly. Testing mastic samples in the laboratory using dynamic shear rheometer (DSR) was conducted to validate the results obtained from the mixture samples. The significant contribution of this study is that it provides direct testing of the material rather than rely on chemical extraction and recovery.

Original languageBritish English
Title of host publicationAirfield and Highway Pavements 2017
Subtitle of host publicationTesting and Characterization of Bound and Unbound Pavement Materials - Proceedings of the International Conference on Highway Pavements and Airfield Technology 2017
EditorsImad L. Al-Qadi, Hasan Ozer, Eileen M. Velez-Vega, Scott Murrell
PublisherAmerican Society of Civil Engineers (ASCE)
Pages129-140
Number of pages12
ISBN (Electronic)9780784480939
DOIs
StatePublished - 2017
EventInternational Conference on Highway Pavements and Airfield Technology 2017: Testing and Characterization of Bound and Unbound Pavement Materials - Philadelphia, United States
Duration: 27 Aug 201730 Aug 2017

Publication series

NameAirfield and Highway Pavements 2017: Testing and Characterization of Bound and Unbound Pavement Materials - Proceedings of the International Conference on Highway Pavements and Airfield Technology 2017
Volume2017-August

Conference

ConferenceInternational Conference on Highway Pavements and Airfield Technology 2017: Testing and Characterization of Bound and Unbound Pavement Materials
Country/TerritoryUnited States
CityPhiladelphia
Period27/08/1730/08/17

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