Emulsion Task Force ETF AASHTO TSP 2 Indianapolis

Emulsion Task Force (ETF) AASHTO TSP 2 Indianapolis, IN Nov 28 -29, 2018 By: Colin A. Franco, P. E. Assc. Chief Eng. RIDOT

ETG & ETF – Founding Father Jim Sorenson

ETG - Formation PAVEMENT PRESERVATION EXPERT TASK GROUP (PPETG) § Established in 1991 by FHWA / Jim Sorenson § Promote the institutionalization of the concepts of pavement preservation § Parent group of “Emulsion Task Force”

Bridge Preservation Partnership

Mission PPETG § The FHWA PPETG will advance and improve the state of the practice in the area of pavement preservation by working collaboratively with federal, state, local agencies, industry, academic interests, and the 9 regional bridge & pavement preservation partnerships.

Emulsion Task Force (ETF)

ETF - Background üIdea conceived at AEMA-ISSA-ARRA meeting February 2008 under guidance of Jim Sorenson, FHWA üIdentified need for industry expertise and involvement in ongoing research activities pertaining to asphalt emulsions and finished product systems üFirst meeting in Newport Beach, CA April 7 -8, 2008

EFT - Original Scope Deliverables üAdvance the Effort to Develop Performance Based Methods & Specification for Emulsions ● Protocols for design ● Protocols for performance ● Protocols for inspection & acceptance üEncourage Adoption of Uniform National Standards

ETF - Subcommittees § Emulsion Testing & Residue Recovery Methods ● Arlis Kadrmas- Chair § Residue Tests ● Gayle King- Chair Note: Subcommittees Combined as of March 2010 ● Arlis Kadrmas to chair combined group

ETF - Subcommittees § Aggregates, Mix Design, and Performance Tests ● Mary Stroup-Gardiner- Chair § Approved Supplier Certification ● Roger Hayner- Chair § Inspection & Acceptance ● Colin Franco- Chair § Tack Coat Review (Formed 7/26/10) ● Chris Abadie- Chair Recycling Emulsions ( NEW)

AASHTO Submittals - Deliverables § Four Standards submitted to AASHTO for Adoption ● Standard Practice for Certifying Suppliers of Emulsified Asphalt ● Recovering Residue from Emulsified Asphalt using Low Temperature Evaporative Techniques – AASHTO TP-72 ● Determining Asphalt Binder Bond Strength by Means of the Bitumen Bond Strength Test (BBS) ● Performance-Graded Asphalt Binder for Surface Treatments (Surface Performance Graded (SPG) Spec)

AASHTO Submittals – Deliverables (cont. ) § 6 Test methods for chip seals submitted to AASHTO SOM Note: Test methods developed and compiled by P. I. S. Shuler through NCHRP 680

Experimental Approach (Initial Strawman) – for E/SPG Purpose Residue Recovery Test Forced Draft Oven Conditions Report 24 hrs @ambient + ü% Residue 24 hrs @60ºC Tests on Residue from Forced Draft Oven High Temperature DSR-MSCR Th DSR freq sweep Th Polymer Identifier DSR-MSCR Th @3200 Pa (Elasticity/Durability) High Float Identifier DSR – Th (Bleeding)* non-linearity Tests on PAV after Forced Draft Oven Residue Low Temperature DSR freq sweep 10 & 20 º C Model low T (Aged Brittleness)* Polymer Degradation DSR-MSCR Th @3200 Pa (Before/After PAV)* Bending Beam Rheometer üJnr üG* & phase angle ü% Recoverable Strain üTest to be developed üG* üPhase Angle üRecoverable Strain Ratio

Emulsion Use and Performance Survey of PP Treatments § Emulsion Product/System Survey Evaluation § Conducted by Andrew Hanz of Univ. Wisconsin Madison and Colin Franco of RIDOT ● Updated prior survey format and submitted to ETF – Identify/prioritize widely used applications – Define 2 critical distresses and mechanism of failure for priority application – Determine testing needs – Existing Tests which are applicable – Research or new tests needed

ETF Survey Results ● Top Product Usage Priority – Chipseals= 100% – Tack Coat= 66. 7% – Microsurfacing= 62% ● Modes of Failure Defined- e. g: Chipseals – Chip Loss – Bleeding – Binder Cracking (Reflective or Environmental) – Underlying Mechanisms Identified ● Existing Tests Available- 84% Yes

AASHTO Construction Specification J. T. F. • AASHTO has Commissioned a Joint Task Force (S. O. Maintenance, S. O. Construction, and Comp) to work on the construction guide specifications for all emulsion treatments. • Larry Galehouse – was instrumental in getting this going – working with AASHTO COMP, S. O. Maintenance, and S. O. Construction

Accomplishments- Pre 2013 § Best Practices Document (draft) ● Original deliverable for Chip Seals and Micro Surfacings. § Low Temperature Residue Recovery Method ● Plan for Inter-lab Study and data collection (ongoing) TP 72 ● Precision and bias study with AMRL for TP 72

ETF Reenergized Mission - 2013 § Advance the Effort to Develop Performance Based Methods & Specification for Emulsions § Encourage Adoption of Uniform National Standards § Develop AASHTO STDs for all the Emulsion Treatments (listed on next slide) ● ● Materials Specs Test Methods Design Practices Construction Guide Specs § Develop QA protocols and standards for all Emulsion Treatments

ETF Reenergized Mission- Post 2013, Treatments Requiring Specs Ø Chip Seal Ø Micro Surfacing Ø Tack Coat Ø Fog Seal Ø Scrub Seal Ø Sand Seal Ø Slurry Seal Ø Foam Asphalt Stabilization Ø Thin Bonded Surface Treatment Ø Cold Mixes o Virgin o Recycled o CIR

Accomplishments, 2015, Emulsion Binder Specifications § M 140, Published Fall 2016 § M 208, Published Fall 2016 § M-316, Published Fall 2016 § All new AASHTO Standards

Accomplishments – Emulsion Treatment Standards Status: AASHTO Emulsion STDs AASHTO STANDARDS M / MP T / TP R W/ SOM Comments Construction Guide Specs Chip Seal MP 27 -16 PP 82 -16 NCHRP 14 -37 Microsurfacing MP 28 -16 PP 83 -16 NCHRP 14 -37 Tack Coat MP-XX* PP 93 -18 Fog Seal MP 33 -17 PP 88 -17 NCHRP 14 -37 Emulsion Treatments Best Practices Scrub Seal Y** PP 91 -18 Sand Seal MP 34 -18 PP 90 -18 Slurry Seal MP 32 -17 PP 87 -17 ü 2018 NCHRP 9 -62 Foam Asphalt Stabilization Bonded Surface Treatments (Nova Chip) Cold Recycled Mixtures MP 31 -17 ü PP 86 -17 Legend Emulsion Binder Standards M / MP T / TP R W/TRB Emulsified Asphalt M 140 -16 T=Test Methods Cationic Emulsified Asphalt M 208 -16 R=Design Practices Polymer-Modified Cationic Emulsified Asphalt M 316 -16 NCHRP 9 -63 Emulsion/Surface Performance Grades (E/SPG) M=Material Specs P=Provisional ü=Draft STD Submitted to SOM Y**=Tabled by ETF

Next Steps-Short Term Plan Ø Complete drafting of AASHTO standards for remaining emulsion treatments Ø Develop QA protocols for emulsion treatments starting with microsurfacing and chip seals Ø Chip Seal QA Std. Completed Ø Complete Draft of E/SPG Specifications

QA – Holistic Approach for all Emulsion Treatments Ø Ø National Accepted Standards o o Materials Specs, Test Methods, Design Practices, Construction Specs, etc Materials QA: o o Acceptance Testing (Agency) QC - Quality Control (Contractor) IA - Independent Assurance (Agency) New Process / Product Acceptance Procedures Materials Certification: o o o Agency Acceptance Plans QC Plans (Contractor) Vendor Supplied Material Certifications Workmanship QA: o o Equipment Calibration Construction Process Checks

QA – Holistic Approach (cont. ) Ø Education, Training, and Certification: ◦ ◦ ◦ Define the training needs for Agency / Contactor Staff Education and Training Resources, NHI, TCCC, and Industry Certification Program for Contractor / Agency Field Staff Note: National Center for Pavement Preservation is taking the lead on education and training. WRAPP is helping.

Development of SPG Specification for Emulsions using Superpave Principles Ø SWG Chair, Mike Voth of FHWA is leading this effort o Research and field studies being used for SPG development: o Tx. DOT – Chip seals, Darren Hazlett with Dr. Amy Epps o NCHRP project 9 -50 – Dr. R. Kim at NC State o Federal Lands Chip Seal research by Dr. Gayle King Note 1. PG - Surface Performance Graded Note 2. This work will supplement the Tx. DOT SPG spec currently at the AASHTO SOM.

Development of SPG Specification for Emulsions using Superpave Principles Plans for 2018 Ø Develop a draft specification for review by the ETF – To complete review by 2018. Ø Conduct field trials using the specification. TXDOT has already conducted trials with their spec. Ø Finalize the spec for review by AASHTO in 2019? ? Ø NCHRP Project 9 -63 will validate E/SPG Spec. Note: draft ETF spec is part of the proposal.

Draft E/SPG Specification (Example)

ETF Research Ø Successfully Initiated Research: 1) 2) 3) NCHRP 14 -37: Construction Spec for Chip Seal, Microsurfacing, Fog Seal NCHRP 9 -62: Cold Recycling Mixtures NCHRP 9 -63: Emulsion Performance Grading Ø Problem Statements 2019 1) 2) Construction Guide Specs – Slurry Seals and Tack Coats Emulsion based rejuvenating seals Ø Proposal to FHWA Office of Innovation for emulsion

Promoting the Use of Emulsions - Need a comprehensive Plan Now that the AASHTO Standards exist for most emulsion treatments, we now need to: § § Develop a marketing plan/marketing tools Promote the technology to ● Agencies ● Industry ● Academia – create course curricula § How will this be done? ● Regional PP groups ● AASHTO SO Mat, SO Maint, SO Hwy Design, ● AEMA-ISSA-ARRA meetings/conferences. = Subcommittee needed !!!!!? =

Acknowledgements Jim Sorenson 1949 -2009 Champion of the Pavement Preservation Movement

Questions… ?