Effects of different aging methods on chemical and rheological properties of bitumen

Giulia Tarsi, Aikaterini Varveri, Claudio Lantieri, Athanasios Scarpas, Cesare Sangiorgi

Research output: Contribution to journalArticleScientificpeer-review

15 Citations (Scopus)
39 Downloads (Pure)

Abstract

Bitumen undergoes ageing, which leads to changes in its chemical and rheological properties, causing it to become harder and more brittle with time. This study aims to compare the effects of different laboratory ageing methods on the chemistry and rheology of three bitumen types: a Pen 40=60, a Pen 70=100, and a polymer-modified bitumen (PmB). Four ageing protocols were applied: ageing at room temperature, oven ageing, pressure ageing vessel (PAV), and rolling thin-film oven test (RTFOT) combined with PAVageing. The effects of temperature, pressure, and ageing time were studied using dynamic shear tests and infrared spectroscopy. The results highlight the relationship between chemistry and rheology of bitumen. Bitumen hardening, which was revealed by an increase in complex modulus and a decrease in phase angle, was reflected in the growth of specific chemical functional groups. Among all materials, soft bitumen showed the greater tendency to oxidize. Different behavior was observed for PmB, which presented the highest resistance against oxidation among the studied bitumens, even though the reaction with oxygen caused the deterioration of the added polymer modifiers.

Original languageEnglish
Article number04018009
Number of pages8
JournalJournal of Materials in Civil Engineering
Volume30
Issue number3
DOIs
Publication statusPublished - 1 Mar 2018

Keywords

  • Ageing
  • Bitumen
  • Chemistry
  • Fourier transform infrared spectroscopy (FTIR)
  • Rheology

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