Moving Research into Practice. Support for Implementation of Proposed AASHTO Standards for Asphalt Binders and Mixtures

A key activity of the FHWA Expert Task Groups (ETGs) for Asphalt Binders and Asphalt Mixtures and Construction was vetting of proposed new and revised AASHTO standard specifications, tests, and practices developed through NCHRP before their submission to the AASHTO Committee on Materials and Pavements (COMP) for review and potential adoption. In some cases, the ETGs might even conduct additional laboratory evaluation and refinement of proposed standards before they were sent to COMP. Overall, this process assisted COMP in the speedy adoption of worthwhile new or revised standards by assessing the supporting data, catching errors in methodology or text, and providing an independent third-party evaluation by practitioners from the DOTs and industry. NCHRP Projects 09-52, 9-54, 9-56A, 9-59, 9-60, and 9-61 are each developing new or revised AASHTO standards as follows: 09-52 (completed): (1) proposed changes to AASHTO R 30 and (2) a proposed AASHTO practice to measure the effects of asphalt plant mixing and processing on binder absorption by aggregate and asphalt mixture characteristics in the field. 09-54 (estimated completion, November 2019): a proposed procedure for the long-term conditioning of uncompacted hot mix asphalt (HMA) for performance testing to simulate the aging that occurs over the service life of a pavement. 09-56A (estimated completion, September 2019): a statistically valid correction factor verification procedure to identify and troubleshoot causes for non-comparing, statistically different, or biased results of AASHTO T 308. 09-59 (completed): proposed revisions to AASHTO T 313, M 320, and M 332 to (1) replace current binder fatigue test temperatures with temperatures tied to the low temperature PG Grade; (2) replace current binder fatigue specification parameter, |G*| sin δ, by the Glover-Rowe parameter (GRP = |G*| cos2 δ / sin δ); and (3) include in the binder fatigue specification an allowable range for the Christensen-Anderson R-value of from 1.5 to 2.5, after RTFOT/20-hour PAV aging. 09-60 (estimated completion, December 2019): proposed changes to the AASHTO M 320 and M 332 and their supporting tests and practices to remedy gaps and shortcomings related to the premature loss of asphalt pavement durability in the form of cracking and raveling. 09-61 (estimated completion, February 2020): propose revised or new laboratory aging methods to accurately simulate the short-term (from production to placement) and long-term (in-service) aging of asphalt binders compared to the current RTFO and PAV conditioning procedures. This project will provide technical support to AASHTO COMP in its review of these NCHRP products for possible adoption as full or provisional standards. The objective of this implementation project is to support the review and potential adoption by the AASHTO Committee on Materials and Pavements of proposed AASHTO standards produced in NCHRP Projects 09-52, 09-54, 09-56A, 09-59, 09-60, and 09-61.

Language

  • English

Project

  • Status: Proposed
  • Funding: $120000
  • Contract Numbers:

    Project 20-44(19)

  • Sponsor Organizations:

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Project Managers:

    Harrigan, Edward

  • Start Date: 20190722
  • Expected Completion Date: 0
  • Actual Completion Date: 0

Subject/Index Terms

Filing Info

  • Accession Number: 01712247
  • Record Type: Research project
  • Source Agency: Transportation Research Board
  • Contract Numbers: Project 20-44(19)
  • Files: TRB, RiP
  • Created Date: Jul 22 2019 3:30PM