1. Update from FHWA Emulsion Task Force
Pavement Preservation & Recycling Alliance
Baltimore, Maryland
November 18, 2014
Larry Galehouse, P.E., P.S.
Director, National Center for Pavement Preservation 25

2. #2
First, its goal was to review and refine material oriented research needs related to pavement preservation. This includes evaluation of the existing Pavement Preservation Roadmap Problem Statements and Consortium on Asphalt Research work plans and research. The group is expected to review and make recommendations to integrate related research activities as well as coordinate activities and knowledge sharing with SuperPave ETGs, TRB, NCHRP as well as within Industry through AEMA, ISSA, ARRA and the Asphalt Institute.
Second, the group is to proactively encourage adoption of uniform national standards for Pavement Preservation technologies through AASHTO and ASTM. This would include promotion of advanced performance based methods and specifications as well as material related certification standards.

4. Increase the Knowledge in Asphalt Emulsion Technology
GOAL #1
Increase the Knowledge in
Asphalt Emulsion Technology
Absolutely No
Understanding of
Asphalt Emulsions
Complete
Agencies
Contractors
Suppliers

5. Address Specific Needs in Asphalt Emulsion Technology
GOAL #2
Address Specific Needs in
Asphalt Emulsion Technology
Modify existing binder testing equipment and protocols to achieve accurate, representative, and repeatable estimates of performance of the residual asphalt.
2. Create practical and cost-effective testing protocols, which build upon existing PG methodologies and equipment.
3. Develop appropriate residue recovery methods for testing.

6. Develop New Standards and Methods in Asphalt Emulsion Technology
GOAL #3
Develop New Standards and Methods in
Asphalt Emulsion Technology
AASHTO Protocols for:
Design
Performance
Inspection & Acceptance

7. Develop National Specifications for Asphalt Emulsion Treatments
GOAL #4
Develop National Specifications for
Asphalt Emulsion Treatments
AASHTO specifications for:
Chip Seal
Cold In-place Recycling
Cold Mixes
Fog Seal
Micro Surfacing
Sand Seal
Scrub Seal
Slurry Seal
Tack Coat

8. Surface Performance Grade (SPG) System
GOAL #5
Develop a
Surface Performance Grade (SPG) System
for Asphalt Emulsions
Develop new grading standards for the appropriate preservation treatments.
Develop application specific performance- graded residue specifications.

9. Emulsion Task Force Subcommittees
Residue Recovery and Testing
Design Group-Spray and Mixtures
Supplier Certification and QA
Recycling Emulsions
Research
Asphalt Emulsion Special Working Group

17. FHWA Emulsion Task Force

18. Standards submitted to AASHTO
in 2010 for Adoption
Standard Practice for Certifying Suppliers of Emulsified Asphalt – Provision (PP 71)
Recovering Residue from Emulsified Asphalt using Low Temperature Evaporative Techniques – Provision (PP 72)
Determining Asphalt Binder Bond Strength by Means of the Bitumen Bond Strength Test (BBS) – Provision (TP 91)
Performance-Graded Asphalt Binder for Surface Treatments (Surface Performance Graded (SPG) Spec)– tabled

19. Immediate Focus Areas
Develop AASHTO treatment standards for micro surfacing and chip seals
Address customer need to update the state of practice
Eliminated unnecessary testing procedures and refine existing test parameters.

20. Established Standards for All Submittals to AASHTO
Development of Treatment Standards for AASHTO Require:
Design Specification
Design Practices
Construction Guide Specification

21. Products Developed and Delivered to
AASHTO in 2014
Standard Specification for Materials for Micro Surfacing
Standard Practice for Micro Surfacing Design
Standard Specification for Micro Surfacing Construction

22. Products Developed and Delivered to
AASHTO in 2014
Standard Specification for Materials for Chip Seals
Standard Practice for Chip Seal Design
Standard Specification for Chip Seal Construction
Chip Seal Practices

23. Products Developed and Delivered to
AASHTO in 2014
Revisions to Standard Specification for Emulsified Asphalt (anionic), M 140
Revisions to Standard Specification for Cationic Emulsified Asphalt, M 208
Revisions to Standard Specification for Polymer-Modified Emulsified Asphalt, M 316
The re-written M 140 covers 15 grades of emulsified asphalt (anionic) including grades for varying climate conditions with the introduction of “h” (hard) grade for very hot and/or high stress traffic areas, a standard grade, and an “s” (soft) grade for cold climates. The rapid setting emulsion types are shown in the table above. The three-level grading approach (h, standard, s) was based on a study by Gayle King which reviewed and evaluated pen grades used throughout the U.S.
The updated M 208 added 5 grades: CRS-1h, CRS-1s, CRS-2h, CRS-2s, and CQS-1. Just like the added anionic grades in the M 140 spec, these additional grades provide options for agencies with hot or cold climatic conditions or unique traffic conditions…removing the “one size fits all” approach.
The M 316 specification updated to cover 11 grades –both anionic and cationic- of polymer modified emulsified asphalt. Again, consistent with M 140 & M 208, the “h”, standard, and “s” grades were added for flexibility to address varying climatic and/or traffic conditions. The previous version of M 316 only had two grades: CRS-2P and CRS-2L.

24. Next Steps
AASHTO specifications for:
Slurry Seals
Tack Coats

25. Larry Galehouse, P.E., P.S. Director
National Center for Pavement Preservation
2857 Jolly Road
Okemos, Michigan
(517) • Fax: (517) 25