INVESTIGATION OF LABORATORY AGING PROCESSES OF ASPHALT BINDERS USED IN FLORIDA

A laboratory investigation was performed to evaluate a variety of aging processes used for simulating the long-term aging of asphalt binders. Four promising methods investigated in this study include an extended thin film oven test (TFOT), an ultraviolet (UV) chamber, the California tilt oven (CTO), and the pressure aging vessel (PAV). A few conventional asphalts commonly used in Florida and a few modified binders were subjected to these aging processes, and their aged residues were tested for comparison of aging severity. Because of the insensitivity of consistency measurements at lower temperatures, the most sensitive parameter for differentiating the aging severity was found to be the aging index at 60 deg C, which is the ratio of absolute viscosities at 60 deg C. On the basis of this parameter, the relative aging severities of aging processes were established. Various asphalts were found to exhibit different aging severities when subjected to different aging processes. Asphalts from different sources exhibit differentiable degrees of volatile loss when subjected to the extended TFOT. The UV chamber was found to be effective only in aging the surfaces of the binder samples. Low-viscosity asphalts were found to age more in the CTO process. Whereas low-volatile-loss asphalts show less aging in most aging processes, some high-volatile-loss asphalts could age less in the PAV process.

Language

  • English

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 60-70
  • Monograph Title: Asphalt concrete mix materials
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00669040
  • Record Type: Publication
  • ISBN: 030905513X
  • Files: TRIS, TRB
  • Created Date: Nov 23 1994 12:00AM