HMA Training

HMA Training

Research Implementation WHRP Flexible Group Barry Paye, PE Chief Materials Engineer 2016 Mid-Continent Symposium Factors Affecting Asphalt Mixture Durability (WHRP 14-06) General Category Environment Drainage Construction Mixture Composition Specific Factors Temperature

Moisture Surface Subsurface Weather Conditions Segregation Compaction Joints Layer Bond Aggregate Properties Binder Properties Gradation Volumetric Properties Volumetric Properties In-Place Air Voids

Permeability Strength and resistance to rutting Stiffness Resistance to cracking Effective Volume of Binder VBE = VMA-Air voids Durability and resistance to cracking improves with increasing VBE Other Durability Changes VMA

Increased to 14.5 for 12.5mm LT, MT Mixes in 2015 Design VBE NMAS, mm 37.5 25.0 19.0 12.5 9.5 4.75 All SMA Minimum Design Design Air Voids, VMA, vol %

vol % 11 4 12 4 13 4 14 4 15 4 16 4 17 4 Minimum Design VBE,

vol % 7 8 9 10 11 12 13 Cracking Resistance: Effect of VBE STOA LTOA 9.0 8.0 7.0 Flexibility Index

6.0 5.0 4.0 3.0 2.0 1.0 0.0 9.5 12.5 NMAS 19 Other Durability Changes VMA

Increased to 14.5 for 12.5mm LT, MT Mixes in 2015 Moisture Sensitivity Moving the TSR from 70/75 to 75/80 in 2017 Cold Weather Paving WMA Additive Required below 40F in 2016 Air Void Regression Design Mix to standard 4.0% Air Void Adding AC to get to a 3.0% Air Void 0.2 to 0.3% increase in AC content in a mix

Increase in density targets to 93% in the field Should yield greater than 10% increase in pavement life Note: Percent Within Limits Specifications also add to these enhancements (Pilot Stage) Increasing VMA 0.5 Percent Southern Asphalt Zone Effective Recycled Binder Ratio 0 0.1 0.2 0.3

0.4 Estimated STOA Flexibility Index 12.5 mm 12.5 mm 9.5 mm 9.5 mm VBE 11.0 VBE 11.5 VBE 12.0 VBE12.5 PG 58-28 S PG 58-28 S PG 58-28 S PG 58-28 S 8.0 7.0 6.0 5.0 3.9 8.7

7.7 6.7 5.6 4.6 9.4 8.4 7.3 6.3 5.3 10.1 9.0 8.0 7.0 6.0 Improving Durability

Increase Effective Binder Content Increase design VMA Decrease design air voids Decrease design gyrations Smaller NMAS mixtures SMA Polymer modified binder High effective binder content Marylands high durability mixture Cracking Resistance: Effect of Recycle Content

STOA LTOA 10.0 9.0 8.0 Flexibility Index 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 Virgin

RAP Recycle Content RAP+RAS Performance Testing Move to Performance instead of recipe specs Hamburg Wheel Moisture & Rutting I-FIT Fatigue Cracking DCT Low Temperature Cracking Several WHRP Research Projects Looking at Specification Development of these Also doing research to validate Asphalt Content via Ignition oven

Laboratory Equipment Hamburg Wheel Ignition Oven DCT (photo courtesy of STATE Testing) 13 WHRP Research Asphalt Binder Extraction NCAT 16-02 Performance Testing UW-Madison 15-04 Joints and Density Behnke Materials 15-09 Moisture Sensitivity UW-Madison 17-04 (starting) Balanced Mix Design NCAT 16-06 (starting)

Binder Spec Changes Prior to 2016 New construction, reconstruction or pavement replacement PG 58-28 Overlays PG 64-22 Wisconsin Climate Zones Binder Grades Northern Zone New construction, reconstruction or pavement replacement Upper Layers: PG 58-34 Lower Layers: PG 58-28

Other projects (Overlay, etc.) All Layers: PG 58-28 Southern Zone All Layers: PG 58-28 Cracking Resistance: Effect of Virgin Binder Low Grade STOA LTOA 9.0 8.0 7.0 Flexibility Index

6.0 5.0 4.0 3.0 2.0 1.0 0.0 -34 -28 Virgin Binder Grade -22 PG 58-28S Versus PG 64-22S Effective Recycled Binder

Ratio 0 0.1 0.2 0.3 0.4 Estimated STOA Flexibility Index 12.5 mm 12.5 mm 19 mm 19 mm PG 58-28 S PG 64-22 S PG 58-28 S PG 64-22 S 8.0 7.0 6.0 5.0 3.9

5.7 4.6 3.6 2.6 1.6 6.6 5.6 4.6 3.6 2.6 4.3 3.3 2.3 1.2 0.2 Cracking Resistance: Effect of

Modification STOA LTOA 9.0 8.0 7.0 Flexibility Index 6.0 5.0 4.0 3.0 2.0 1.0 0.0 S

H Modification V 2015 Updates - Tack Coat Increased application rate from 0.025 to 0.05-0.07 gal/sy Unify layers increased bond strength Tack is cheap insurance Use it! Tack Application Rates Factors Affecting Asphalt Mixture Durability General Category Environment

Drainage Construction Mixture Composition Specific Factors Temperature Moisture Surface Subsurface Weather Conditions Segregation Compaction Joints Layer Bond Aggregate Properties Binder Properties

Gradation Volumetric Properties Questions/Contact Barry Paye Materials Management Section Phone: 608-246-7945 Email: [email protected]

Recently Viewed Presentations

  • RANDY MCKAIN Program Director of Youth Ministry and ...

    RANDY MCKAIN Program Director of Youth Ministry and ...

    This has created subculture of adolescents who are looking for guidance. ... Tiger McCluen of Youth Leadership in Minneapolis, MN says there are three things teens are looking for from an adult. To be known. To be valued. To be...
  • More chemical quantities - hcs.stier.org

    More chemical quantities - hcs.stier.org

    In 1 mole of CO. 2. there is 1 mole of carbon and 2 moles of oxygen.In one molecule of CO. 2. there is 1 atomof C and 2 atoms of O. Empirical to molecular. Since the empirical formula is...
  • Science & Technology SMT 310  Prerequisite: Completion of

    Science & Technology SMT 310 Prerequisite: Completion of

    * Rent your NXT Card Rent at bookstore and return to book store for credit after final exam. Make certain batteries are good before you accept or use it. They use two AAA alkaline batteries. * Register your NXT "Clicker"...
  • NY State ATA Hall of Fame

    NY State ATA Hall of Fame

    NY State ATA Hall of Fame Welcome to our Hall of Fame! The computer will automatically guide you through the background on all of our inductees. Daniel Tartick Inducted 2017 2007 Eastern Zone Singles Championship Champion Runner-up 200x200 Western Zone...
  • Revised HRD Strategy Towards 2030 - National Skills Authority

    Revised HRD Strategy Towards 2030 - National Skills Authority

    The Human Resource Development Strategy (HRDSA) is a coordination framework. Intended to combine the key levers of the constituent parts of the HRD system. The HRD subsystems (the occupational learning system e.g. SETA's TVET, and the Technology and Innovation Systems)...
  • "Energizing" Higher Education through Critical Thinking

    "Energizing" Higher Education through Critical Thinking

    Critical Thinking, Defined "Critical thinking is the process of purposeful, reflective judgment. Critical thinking manifests itself in giving reasoned and fair-minded consideration to evidence, conceptualizations, methods, contexts, and standards in order to decide what to believe or what to do."...
  • Promoting active learning - CA Sri Lanka

    Promoting active learning - CA Sri Lanka

    Costs, revenue and profit. Topics to be covered: The meaning of cost. Production in the short-run: the law of diminishing returns . Short-run production function. Costs in the short-run. Production in the long run . Relationship between sales revenue and...
  • Writing hooks - Grosse Pointe Public School System

    Writing hooks - Grosse Pointe Public School System

    Writing Hooks. Why Where How. In Narrative Writing. A hook is an action that pulls your reader further into a story. Anything that arouses curiosity and interest from your reader is a narrative hook. It's that "I couldn't put it...