FHWA’s Concrete Pavement and Materials Technical Feedback Group (TFG) met recently to discuss several focal areas identified during the group’s formative meeting in March.
FHWA Pavement Materials Team Leader Gina Ahlstrom announced the launch of a new pooled fund called “Demonstration to Advance New Pavement Technologies.” The goal is to support and showcase the implementation of innovative pavement technologies products and processes by DOTs.
Key topics included development of performance engineered mixture (PEM) programs, implementation of strategic pavement preservation, integration of sustainability and resilience into decision making process, and other topics as identified by the technical advisory committee. The pooled fund is led by FHWA (with a $2 Million contribution) and has a duration of 5 years. State DOTs can participate for $10,000.
Dr. Larry Sutter, Assistant Dean of Research and External Engagement at Michigan Tech, provided an excellent update on “Trends in Fly Ash Use and Supply.” He provided an in-depth summary of fly ash use and benefits. He commented that fly ash supply dynamics are changing and that the materials are in short supply in some markets.
Concrete pavement materials are trending toward more ternary mixtures and new SCMs, he says. Testing and verification of performance will become increasingly important with these new mixtures and constituent materials, Dr. Sutter reports, noting that there’s a significant opportunity with harvested (or beneficiated) fly ash from various sources (e.g., detention ponds) in the coming years.
Discussions also focused on concrete overlays on distressed asphalt, notably, what gaps may exist in design methods and guidance materials. This effort is seen as complementary to FHWA’s ongoing EDC6 effort on Targeted Overlays Pavement Solutions. (See related story, FHWA Expands Overlays Outreach to Division Offices.)
Leif Wathne represents ACPA and the concrete pavement industry on the CP&M Technical Feedback Group.