TOPS Webinar: Highly Modified Asphalt and Stone Matrix Asphalt |
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The Targeted Overlay Pavement Solutions (TOPS) Every Day Counts team will host its third webinar of the year February 24 at 1:30 ET. Participants will learn about the benefits, specifications, and construction considerations when using highly modified asphalt (HiMA) and stone matrix asphalt (SMA) overlays.
Join us for a TOPS webinar!
February 24, 2022
1:30 – 3:00 ET
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Tim Aschenbrener, FHWA, will introduce the Every Day Counts TOPS program.
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Don Watson, National Center for Asphalt Technology (NCAT), will provide an SMA overview.
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Sheila Hines, a GDOT consultant, will describe agency experiences with SMA projects, their performance, and lessons learned.
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Adriana Vargas-Nordcbeck, NCAT, will provide a HiMA overview.
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Howie Moseley, FDOT, will share agency experiences with HiMA projects, their performance, and lessons learned.
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The Federal Highway Administration is committed to providing equal access to this webinar for all participants. If you need alternative formats or services because of a disability, please contact Tim Aschenbrener at 303-263-4034 or via email timothy.aschenbrener@dot.gov with your request by close of business February 17, 2022.
Florida Benefits from Highly Modified Asphalt Overlays
Highly Modified Asphalt (HiMA) is having a big impact in Florida. Florida DOT began using HiMA six years ago to address severe rutting observed in high-stress locations that were subject to heavy axle loads and slow-moving traffic, such as truck weigh stations, agricultural inspection stations, and high-volume intersections and interchanges. Since then, the agency has placed more than 500,000 tons of HiMA mixtures on at least 40 projects across the State. In addition, FDOT expanded use of HiMA to other types of applications such as mitigating reflective cracking from construction joints in overlayed PCC pavements and reducing raveling in open-graded friction courses. HiMA mixtures have an increased structural contribution, potentially allowing for a reduction in pavement thickness without sacrificing performance. FDOT performed a preliminary analysis and concluded that HiMA projects need to last 10 months longer than conventional polymer-modified asphalt projects to pay for the increased cost. FDOT research and preliminary data suggest the expected gain in pavement life will exceed what is needed to offset the additional cost of HiMA.
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Every Day Counts Outtake
About 32 percent of urban roads and 14 percent of rural roads are in poor condition. Repairing them all could require $836B. FHWA’s Every Day Counts initiative known as TOPS encourages use of improved, cost-effective asphalt and concrete overlays. Learn more in this EDC outtake.
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To learn more about TOPS, contact Tim Aschenbrener (asphalt) and Sam Tyson (concrete), EDC-6 team co-leads.
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