Minnesota Department of Transportation

511 Travel Info

Road Research

NRRA Flexible Team

Orange barrels on a highway

MnROAD | NRRA | Structure & Teams | Flexible Team

Mix Rejuvenator Synthesis (Phase I)

Status: Completed
Project Start Date: May 15, 2019
Project End Date: April 15, 2020


The objective of this project is to identify the types of mix rejuvenators available and their performance to date. This project also aims to determine the benefits and effectiveness, in terms of performance and cost, to serve as guidance in decision making. This synthesis will gather the experience and knowledge from the NRRA state members regarding their current application of asphalt rejuvenators or recycling agents with high reclaimed asphalt pavement mixes. The synthesis will mainly focus on the following aspects.

  1. Summary of national state of practice
    1. a. Recent National Cooperative Highway Research Program (NCHRP) recommendations
    2. b. Texas Department of Transportation projects
    3. c. Other national projects that are not in the NRRA member states
  2. Agency specifications that allow or inhibit the usage of rejuvenators including laboratory and performance testing
  3. Type of products that have been used by each member state
  4. Performance of projects surveyed and identification of future projects for NRRA monitoring
  5. Inputs from producers or suppliers

Methodology summary

The goal of this project is to generate a synthesis on the researches that have been done by the NRRA member states involving rejuvenators related to mix applications. This could include case studies on the types of products out in the market, applications, testing, and field performance. The PI will work with the NRRA Technical Liaison to collect information from all the NRRA state members and conduct literature review on available national studies. Once all the data have been gathered, the PI will summarize the findings in a report, which will be used to guide the NRRA Mix Rejuvenator test sections contract development and testing.


Task 1A: Survey

The PI will survey agencies and suppliers or producers on specifications, products, and performance. The constructed test sections will include mix rejuvenators conducted by the seven NRRA member states (Caltrans, Illinois DOT, Michigan DOT, Minnesota DOT, Missouri DOT, North Dakota DOT, and Wisconsin DOT) if available, and up to three other researches specified by the NRRA Technical Liaison.

  • Scheduled End Date for Final Approval: August 31, 2019
  • Deliverable: A report summarizing the information compiled under Task 1 and meetings with the NRRA Technical Liaison to discuss findings.

Task 2A: Literature review

The PI will conduct brief literature review to summarize the NCHRP report made available and other ongoing or recently completed national studies.

  • Scheduled Date for Final Approval: August 31, 2019
  • Deliverable: A report summarizing the data collected under Task 2 and meetings with the NRRA Technical Liaison to discuss results.

Task 3A: Compile report, technical advisory panel review, and revisions

The PI will prepare a draft final report, following MnDOT publication guidelines, to document project activities, findings and recommendations. This report will be reviewed by the Technical Advisory Panel (TAP), updated by the PI to incorporate technical comments, and then approved by the Technical Liaison before this task is considered complete. If possible, a TAP meeting will be scheduled to facilitate the discussion of the draft report.

  • Scheduled Date for Final Report Approval: August 31, 2019
  • Deliverables: A draft final report for TAP review, and a revised report that is technically complete and approved by the TL for publication.

Task 4A: Editorial review and publication of final report

During this task, the PI will work directly with MnDOT’s contract editors to address editorial comments and finalize the document in a timely manner. The contract editors will publish the report and ensure it meets publication standards.

  • Scheduled End Date: August 31, 2019
  • Deliverables: Final Publishable Report that meets MnDOT’s editorial guidelines and standards

Project team

Principal Investigator: Andrea Blanchette, PE, WSB, ablanchette@wsbeng.com
Co-Investigator: Tom Wood, WSB, twood@wsbeng.com and Sheue Torng Lee, WSB, slee@wsbeng.com
Project Technical Advisory Panel (TAP)

  • Jim Arduino, Georgia Pacific
  • Jason Bausano, Ingevity
  • Andy Cascione, Flint Hills
  • Jo Daniel, UNH
  • Mohamed Elkashef, UC Davis
  • Bob Kluttz, Kraton
  • John Garrity, MnDOT
  • Jerry Geib, MnDOT
  • Andrew Hanz, Mathy
  • Brian Hill, I DOT
  • Alex McCurdy, Poet
  • Pete Montenegro, Collaborative Aggregates
  • Nathan Moore, NCAT
  • Terry Naidoo, Asphalt and Wax Innovations
  • Paul Nolan, MnDOT
  • Dan Oesch, MoDOT
  • Barry Paye, WisDOT
  • Raghu Shrestha, CalTrans
  • Hassan Tabatabaee, Cargill
  • Nam Tran, NCAT
  • Michael Vrtis, MnDOT
  • Randy West, NCAT
  • Chris Williams, US Soybean Board
  • Grant Wollenhaupt, Superior Bowen

Related materials

Final report

Final report, updated 7/21//2020