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ETF Rejuvenator Task Force

ETF Rejuvenator Task Force. June 2019 Update Hassan Tabatabaee, Cargill. Task Force Members. Hassan Tabatabaee, Cargill (Chair) Andrew Hanz , MTE Andy Clayton, Blue Line Larry Galehouse , MSU Pete Montenegro, Collaborative Aggregates (replacing Katy Fleury) Russell Milan, MI Paving

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ETF Rejuvenator Task Force

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  1. ETF Rejuvenator Task Force June 2019 Update Hassan Tabatabaee, Cargill

  2. Task Force Members • Hassan Tabatabaee, Cargill (Chair) • Andrew Hanz, MTE • Andy Clayton, Blue Line • Larry Galehouse, MSU • Pete Montenegro, Collaborative Aggregates (replacing Katy Fleury) • Russell Milan, MI Paving • Gayle King, GHK • Colin Durante, Pavement Technology 2 Conference Calls have been held to discuss TF scope and objectives.

  3. Task Force Objectives • Education: • Offer educational material to ETF and industry on past and current state of the practice for rejuvenators in pavement preservation. • Joint presentation by Andy Calyton, Hassan Tabatabaee, and Andrew Hanz, hopefully during next ETF meeting. • Specification: • Address gaps in pavement preservation specifications with regards to rejuvenators. • Utilize and build on existing and historical state agency and industry specifications • Align activities with other parallel rejuvenator committees (e.g. ASTM and AI). • Research Need Statements • Create RNS to address identified gaps in performance-based test methods and mechanisms for rejuvenators pavement preservation. • Build on RNS previously submitted by ETF to NCHRP.

  4. Education • Joint presentation on past and current state of the practice for rejuvenators in pavement preservation, hopefully during next ETF meeting. • Andy Calyton to present on past rejuvenating pavement preservation practice history, • Hassan Tabatabaee to present on current bio-based rejuvenating practice in pavement preservation • Andrew Hanz to present on NCAT scrub seal life-extension experience. • Future presentations may be potentially organized as a webinar.

  5. Specification • Specification being considered so far: • California Rejuvenating Pavement Preservation Specification • ASTM D4552 (Screening spec for Hot Mix rejuvenators) • Rejuvenator Spec table in Scrub Seal Specification • Possible approaches being considered: • Create separate specification for each pavement preservation application that contains its own embedded rejuvenator specification table (as in the current proposed Scrub Seal spec) • Create a basic stand-alone specification for pavement preservation rejuvenators that can be referenced by other pavement preservation standard methods. • In either case, performance-based test methods for rejuvenating pavement preservation application are a current gap in knowledge.

  6. Research Need Statements • Three general sets of ideas have been proposed by the task force so far. Scope will be narrowed as work begins on the documents: • Scrub seal performance test (includes measuring diffusivity of rejuvenators in underlying layers.) • Rejuvenating fog performance test (includes measuring diffusivity of rejuvenators in underlying layers.) • Emulsion and bitumen quality/analytical assessment after introduction of rejuvenators,– e.g. chemical, stability, rheology, etc. (Potentially expanding research to include emulsion residue modification and softening with additives)

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