Paper Fourier Transformation Infrared Spectroscopic (FTIR) Analysis on Modified Asphalt Binders

The primary objective of this study was to observe any changes in asphalt binder spectra due to modification at different aging conditions. A performance grade (PG) binder (PG 64-24) was modified with different dosages and combinations of PPA (polyphosphoric acid), styrene-butadiene-styrene (SBS), and nanoclay. This analysis was able to detect changes in certain functional groups due to aging. After simulating aging on asphalt binder samples, aromatic index ratios were observed to increase, whereas the aliphatic index ratio decreased. Moreover, reactions that occurred during the aging process caused significant increases within the aromatic index (C=C) and carbonyl index (C=O). Observations made from this analysis led to the conclusion that nanoclay modification might cause changes within the chemical fractions to enhance mechanical properties of asphalt binders, whereas the addition of PPA might have changed the polarity of one or more chemical fractions after the modification. In the case of SBS modification, the emergence of the new peak indicates the existence of a new functional group. Finally, it was evident that changes within the functional groups that occurred due to any modification or aging from the spectroscopic analysis can establish the FTIR spectroscopy as a quick tool to observe changes in the chemical fingerprint of asphalt binders.

Language

  • English

Media Info

  • Media Type: Web
  • Features: References;
  • Pagination: pp 150-159
  • Monograph Title: Tran-SET 2020

Subject/Index Terms

Filing Info

  • Accession Number: 01762794
  • Record Type: Publication
  • ISBN: 9780784483305
  • Files: TRIS, ASCE
  • Created Date: Jan 12 2021 3:03PM