Design and Analysis Procedures for Asphalt Mixtures Containing High-RAP Contents and/or RAS

The objectives of this research are to establish mechanistic test criteria, that ensure pavement durability, for asphalt mixtures (warm and hot) containing high recycled asphalt pavement (RAP) content and/or recycled asphalt shingles (RAS); and propose asphalt mixture specifications that incorporate these mechanistic test criteria as tested on plant produced specimen and/or roadway cores based on the results of the study. The validation of the proposed methodology will be carried out on plant produced mixtures and roadway cores (depending on availability of those cores). Testing of plant-produced mixtures and roadway cores will allow for the evaluation of the impacts of higher RAP percentages and/or RAS on the durability of the evaluated asphalt mixtures. It is anticipated that two field projects from each participating state will be included. Each project will consist of a conventional mixture and mixture containing high RAP and/or RAS content. Thus, a total of four mixtures will be evaluated. Each participating state is expected to provide, at a minimum, the following: job mix formula; sufficient loose mixture for physical and mechanical tests (conventional mix, RAP and/or RAS mix, RAP and RAS sources); field cores (depending on availability); and plant and field project quality assurance/quality control (QA/QC) documentation. The specimens will undergo a rigorous physical and mechanistic testing program that will provide information to assess the expected performance of the various mixtures evaluated in regard to fatigue cracking. The date will be analyzed from a mechanistic standpoint where different damage parameters will be evaluated. The comparison among these parameters will serve as basis to decide the best performance indicators.

Language

  • English

Project

Subject/Index Terms

Filing Info

  • Accession Number: 01648739
  • Record Type: Research project
  • Source Agency: Federal Highway Administration
  • Contract Numbers: TPF-5(294), Louisiana contract 14-5PF; 1000002
  • Files: RiP, USDOT
  • Created Date: Oct 22 2017 1:01AM