CLASSIFICATION OF ASPHALT BINDERS INTO SIMPLE AND COMPLEX BINDERS

The objective of the NCHRP 9-10 Project is to evaluate the suitability of using the Superpave binder and mixture test system for modified asphalt binders. As part of this project, a survey of users and producers of modified asphalts as conducted. Also, a detailed analysis and review of published literature was carried out. These efforts resulted in identifying the asphalt additives most commonly used, the concerns that users and producers have with the application of Superpave binder specification to modified binders, and the projected change in the use of modified binders based on their experience and the future needs for high quality pavements. The results indicate that modified binders will be used more in the future and that there are major concerns regarding the applicability of the Superpave PG-grading system to modified binders. The analysis of information collected from the surveys and the literature search had also resulted in identification of important gaps in the PG-grading system. It is evident that the Superpave specification is based on assumptions that apply only to binders that exhibit simple rheological behavior, such as conventional unmodified asphalts. There is, therefore, a need for a new classification system that differentiates between binders that can be considered as part of the PG-grading system and others that can not. Binders that satisfy the assumption made in the PG-grading system can be considered simple binders. The other binders should be classified as complex binders because they exhibit complex behavior that does not satisfy the assumptions made in the PG-grading system. In addition to the need for a new classification system, a set of new or revised tests are needed to address characteristics that are typical of modified binders that are not included in the current PG-grading.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02702932
• Corporate Authors:

  Association of Asphalt Paving Technologists (AAPT)

  400 Selby Avenue, Suite I
  St Paul, MN  United States  55102
• Authors:
  • Bahia, H U
  • Hislop, W P
  • Zhai, H
  • Rangel, A
• Conference:
  • Asphalt Paving Technology 1998
  • Location: Boston, Massachusetts
  • Date: 1998-3-16 to 1998-3-18
• Publication Date: 1998

Language

• English

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 1-41
• Serial:
  • Journal of the Association of Asphalt Paving Technologists
  • Volume: 67
  • Publisher: Association of Asphalt Paving Technologists (AAPT)
  • ISSN: 0270-2932
  • Serial URL: https://www.asphalttechnology.org/site_page.cfm?pk_association_webpage_menu=9169&pk_association_webpage=19109

Subject/Index Terms

• TRT Terms: Asphalt; Asphalt additives; Asphalt pavements; Binders; Mix design; Rheological properties
• Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 00758866
• Record Type: Publication
• Files: TRIS, ATRI
• Created Date: Jan 21 1999 12:00AM