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Recruitment of the New LTPP SPS-10: Warm Mix Asphalt Experiment

Recruitment of the New LTPP SPS-10: Warm Mix Asphalt Experiment. Gabe Cimini LTPP NCRSC Project Manager. Presentation Outline. LTPP Approach to WMA Research Site Requirements Roles and Responsibilities SPS-10 Nomination Process. Why WMA?. 356 million tons of WMA produced in 2012

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Recruitment of the New LTPP SPS-10: Warm Mix Asphalt Experiment

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  1. Recruitment of the New LTPP SPS-10:Warm Mix Asphalt Experiment • Gabe Cimini • LTPP NCRSC Project Manager

  2. Presentation Outline • LTPP Approach to WMA Research • Site Requirements • Roles and Responsibilities • SPS-10 Nomination Process

  3. Why WMA? • 356 million tons of WMA produced in 2012 • 24% of all plant mix produced in US was WMA • 35 different WMA technologies • WMA is a priority innovation under FHWA’s Every Day Counts (EDC) Initiative

  4. Objectives • Long-term performance of WMA relative to HMA • Capture data on WMA with RAP

  5. Benefits to Agencies • Detailed construction information including a construction report • Rigorous materials testing (over multiple intervals) using latest testing technology • Ongoing FWD, distress, profile, and texture monitoring to study short and long term performance • Ability to study Agency-specific issues related to WMA

  6. SPS-10 Requirements • Overview • AC overlay of existing AC pavements • 2” to 4” overlay thickness • Dense graded mix • RAP content 10-25% (binder replacement) • 1 HMA control test section • 2 WMA test sections • Foaming Process • Chemical Additive • Tack Coats between lifts

  7. Site Layout Requirements • WMA: • Production of ≤ 275°F or • Production at least 30°F less than HMA

  8. Existing Pavement Requirements • Uniformity • Subgrade type/condition • Base thickness/type • Bound layer thickness/type • Surface condition • Traffic loading • Pre-overlay repairs based on Highway Agency’s standard practice

  9. Experiment Layer Requirements • Mix design/binder grade selection based on Agency’s standard practice • Overlay thickness selected by Agency’s standard practice • Uniformity between HMA and WMA • Same binder source/grade • Same aggregate source/gradations • Mix design/JMF

  10. Supplemental Sections • Agencies can build additional test sections that will be monitored as part of the LTPP program • Varying levels of RAP • Additional WMA technologies • Layer thickness variation • Open or gap graded mixtures • Varying aggregate sources/absorption levels • Other variables of interest to Agency

  11. Roles/Responsibilities • Agencies • Nominate project(s) • Validate in-situ conditions • Submit inventory data • Develop plans, specifications, mix design • Provide construction and inspection/control/management • Perform materials sampling/patching • Collect traffic data • Provide traffic control

  12. Sampling Areas (Draft)Coring at 0, 6, 12 and 18 months after construction

  13. Traffic Data Collection Guidelines • Quality traffic data is critical in assessing the vehicle loading on pavements • Permanently mounted sensors whenever possible • As long as a documented calibration plan is followed, data from both portable and permanent equipment will be accepted (required LTPP Traffic Sheet 16 – Site calibration summary) • The agency should plan to repair faulty equipment within 1 month • At a minimum, 2 weeks of continuous classification data 4 times per year (a total of 8 weeks of classification data) • Data to be submitted by the agency on a monthly basis, however, the data will be accepted if submitted quarterly as well • If a WMA test site does not have weight data, then the agency must submit an LTPP Traffic Sheet 10 (Traffic volume and load estimate). Submitting 1 Sheet 10 per year is sufficient

  14. Roles/Responsibilities • FHWA • Develop experimental design/research plan • Coordinate among Agencies • Oversee construction data collection • Perform materials testing • Provide materials sampling support • Collect performance monitoring data • Store, analyze, and report data

  15. Nomination Process • FHWA accepting nominations now • Projects to be constructed in 2014 and 2015 • Nomination forms are available from FHWA and the LTPP Regional Support Contractors (RSCs) • FHWA will evaluate nominations and notify Agencies • Coordination through LTPP RSCs

  16. Additional Tests on Materials • Material Testing somewhat limited • Additional information beneficial on national level • Agencies encouraged to perform additional tests • Recommended by the FHWA Asphalt Mixture Expert Task Group, based upon NCHRP Research Results Digest 370:

  17. Additional Tests on Materials

  18. Contact Information

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