Effect of polymers on aging characteristics of asphalt binders and asphalt-aggregate mixtures

To investigate the durability of asphalt cements, it is essential to understand the physical-chemical behavior of asphalts. Chemical change such as oxidation is thought to be the immediate cause of asphalt composition alterations. These changes create marked differences in the rheological properties of asphalt cements and result in irreversible hardening. It has been claimed that this oxidative hardening is mainly due to the formation of highly polar, strongly oxygen-contained chemical functionality with the asphalt molecules. It is evident that physical-chemical factors provide a useful tool for characterizing the durability of asphalt cements. It has been reported that physical-chemical interactions between oxygen and asphalt molecules control the kinetics of age hardening of asphalt cements rather than the intrinsic reactivity of the molecular component with oxygen. It has been indicated that the age-hardening kinetics of asphalt cements is controlled by the state of dispersion of associated molecules in asphalt instead of by the inherent reactivity of the components with oxygen. However, a Strategic Highway Research Program (SHRP) project regarding the relationship between the chemical composition and physical properties of new and aged asphalt using the pressure air vessel (PAV) test and modified rolling thin-film oven test (RTFOT) to simulate pavement oxidation, observed that the chemical and physical properties among asphalts are quite different from one another. Laboratory results lead to the conclusion that reliable and practical information is obtained only when the behavior of asphalt in the durability test can be correlated with pavement durability in the field. The main objective of the research presented in this paper is to determine the aging characteristics of modified asphalt blends and asphalt-aggregate mixtures.

Language

  • English

Media Info

  • Pagination: 390-5
  • Monograph Title: The government's and the private sector's roles and functions in the financing of toll road projects in Malaysia
  • Serial:
    • Volume: 1

Subject/Index Terms

Filing Info

  • Accession Number: 01437656
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 478105789
  • Files: ATRI
  • Created Date: Aug 24 2012 8:56PM