Impact of Asphalt Modifier Dosage on Modified Binder Rheology and Chemistry with Long-Term Aging

Punit Singhvi, Ahmet Karakas, Hasan Ozer, Imad L. Al-Qadi, Kamal Hossain

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Asphalt modifiers/additives are increasingly used in pavement industry. Additives are commonly used as softeners to decrease the binder performance grade (PG), while polymer modifiers are usually used for heavy traffic applications to reduce permanent deformations. Recently, rejuvenators have been used in recycled pavement applications to reduce cracking susceptibility and as retarders to moisture damage. These modifiers can be derived from crude petroleum and sometimes from a bio-based feedstock. The origin of crude binder and modifier source affects the resulting binder-modifier chemical interaction. The inherent chemical variability affects the rheological performance of modified binders. It also impacts the aging potential of these binders and thereby affecting its long-term field performance. In this study, binders modified with softeners/rejuvenators at various dosages were evaluated for their performance under long-term aging. Rheological characterization of modified binders was determined using frequency sweep, linear amplitude sweep, and low temperature performance with parameters such as Glover-Rowe, R-value, crossover frequency, ΔTc, while the chemical characteristics were determined using Fourier transform infrared spectroscopy (FTIR), and thin layer chromatography and flame ionization detection (TLC-FID). An optimum dosage of the rejuvenator studied was recommended to maximize performance of the modified binder.

Original languageEnglish (US)
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
Pages274-284
Number of pages11
ISBN (Electronic)9780784482469
DOIs
StatePublished - Jan 1 2019
EventInternational Airfield and Highway Pavements Conference 2019: Testing and Characterization of Pavement Materials - Chicago, United States
Duration: Jul 21 2019Jul 24 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
CountryUnited States
CityChicago
Period7/21/197/24/19

Keywords

  • Asphalt rheology
  • asphalt modification
  • chemical characterization
  • long-term aging

ASJC Scopus subject areas

  • Mechanics of Materials
  • Civil and Structural Engineering

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