Update on Performance of Thin Asphalt Overlays Pennsylvania Asphalt - - PowerPoint PPT Presentation

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Update on Performance of Thin Asphalt Overlays Pennsylvania Asphalt - - PowerPoint PPT Presentation

Feb 02, 2023 714 likes •1.19k views

Update on Performance of Thin Asphalt Overlays Pennsylvania Asphalt Pavement Association 55 th Annual Conference Mansour Solaimanian Penn State University 1 Outline Thin Asphalt Overlay Pilot Projects Mix Design/Lab Performance

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Update on Performance of Thin Asphalt Overlays

Mansour Solaimanian Penn State University Pennsylvania Asphalt Pavement Association

55th Annual Conference

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  • Thin Asphalt Overlay Pilot Projects

Outline

  • Mix Design/Lab Performance
  • Field Performance
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PennDOT Research Project on THMAO

 Four Year Project: June 2012 – June 2016

 Three Pilot Projects

  • District 8-0, Dauphin County, SR 0022
  • District 8-0, Lancaster County, SR 0230
  • District 3-0, Lycoming County, SR 0220
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Mix Design Lab Performance

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6.3 mm NMAS Mix Placed at 1 inch thickness

Aggregate: Skid Resistance Level (SRL): E Polymer Modified Binder: PG 76-22 Gyration Level: 75 Design Air Void: 4%, Min. Design VMA: 17 Design Binder Content: 6.7%; 7.0%; 6.9% NO RAP

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Performance Evaluation - HWTD

Specimens under water Test Temperature: 50ºC 20,000 Passes 50 Passes per minute 158-lb load

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Performance Evaluation - HWTD

1 2 3 4 5 6 2 4 6 8 10 12 14 16 18 20 Rut Depth, mm Number of Wheel Passes (X1000)

Thin Asphalt Overlay Project Hamburg Wheel Tracking Tests - 8/23/2012

Temperature = 50ºC Right Track Left Track

1st Pilot Project – SR 0022

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Performance Evaluation – Texas Overlay Tester

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Performance Evaluation – Overlay Tester

Good Performance Cycles to failure > 500

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Tack Coat Evaluation

Trimmed Core Direct Shear Mold Schematics

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11 50 100 150 200 250 300 350 1 2 3 4 5 Interface Shear Stress, KPa Interface Shear Deformation, mm

THMAO Project Tack Coat Evaluation - Core # 5

Deformation Rate: 1 mm/min Test Temperature: 25.5 C

Tack Coat Evaluation

Shear Strength = 44.5 psi (307 KPa) - Good Performance

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Field Performance

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SR 0022

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SR 0022 – 26 Months

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SR 0022

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SR 230 – Finished Overlay

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SR 230 – 16 Months

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SR 230 – 16 Months

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SR 230 – 16 Months

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SR 220 – Existing Sealed Pavement

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SR 220 – Micro-milling

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SR 220 – 13 Months

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SR 220 – 13 Months

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SR 220 – 13 Months

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Skid Resistance Results

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Friction Improvement

Data: Courtesy of PennDOT BOMO

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Friction Improvement

Data: Courtesy of PennDOT BOMO

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Friction Improvement

Data: Courtesy of PennDOT BOMO

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Ride Quality (Smoothness) Improvement

Data: Courtesy of PennDOT BOMO

20 40 60 80 100 120 140 160

April 2012 - Prepave July 2012 - Patched September 2012 - Post Paving November 2013 - 16 Months June 2014 - Two Years September 2014 - 26 Months

Travel - Left Travel - Right IRI, in/mile Travel - Left Travel - Right Passing - Right Passing - Left

SR 0022 - N. Cameron Rd Segment 330, Eastbound

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Ride Quality (Smoothness) Improvement

50 100 150 200 250

May 2013 - Prepave July 2013 - after Paving June 2014 - One Year September 2014 -15 Months

Travel - Left Travel - Right IRI, in/mile Travel - Left Travel - Right Travel - Right Passing - Left

SR230 Segment 280, Eastbound

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Ride Quality (Smoothness) Improvement

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Ride Quality (Smoothness) Improvement

Data: Courtesy of PennDOT BOMO

20 40 60 80 100 120 140 160 180

April 2012 - Prepave July 2012 - Patched September 2012 - Post Paving November 2013 - 16 Months June 2014 - Two Years September 2014 - 26 Months

Travel - Left Travel - Right IRI, in/mile Travel - Left Travel - Right Passing - Right Passing - Left

SR 0022 - N. Cameron Rd Segment 340, Eastbound

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Ride Quality (Smoothness) Improvement

10 20 30 40 50 60 70 80 90

June 2013 - Prepave November 2013 - Paved June 2014 - 9 Months September 2014 - One Year

Travel - Left Travel - Right IRI, in/mile Travel - Left Travel - Right Passing - Right Passing - Left

SR 220, Segment 10 Northbound

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Ride Quality (Smoothness) Improvement

10 20 30 40 50 60 70 80 90 100

June 2013 - Prepave November 2013 - Paved June 2014 - 10 months September 2014 - One Year

Travel - Left Travel - Right IRI, in/mile Travel - Left Travel - Right Passing - Right Passing - Left

SR 220, Segment 50 Northbound

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Rut Measurements

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Rutting, SR 230

  • 1.5
  • 1.0
  • 0.5

0.0 0.5 1.0 1.5 2.0 2.5 25 50 75 100 125 150 175 200 225 250 275 300 325

Meaured Depth, mm SR230 Eastbound, 900 ft. Octobber 15, 2014 ≈ 1/8”

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Rutting, SR 220

  • 1.5
  • 1.0
  • 0.5

0.0 0.5 1.0 1.5 25 50 75 100 125 150 175 200 225 250 275 300 325 Meaured Depth, mm

SR 220, Passing Lane, Control Section, 600 ft. Octobber 8, 2014

≈ 1/10”

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Rutting, SR 0022

  • 3
  • 2
  • 1

1 2 3 4 5 25 50 75 100 125 150 175 200 225 250 275 300 325

Vertical Depth Measurement, mm Distance, cm N Cameron St WB Travel Lane, 300 ft. October 23, 2014

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Ground Penetrating Radar

AID Integrated Testing Vehicle Courtesy of Advanced Infrastructure Design, Inc.

Can GPR provide a reliable estimate

  • f mat density?
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Air Coupled GPR

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Dielectric Distribution Map

Distance from Start (ft) Distance from Edge (ft) 400 600 800 1000 1200 1400 1600 1800 2000 2 4 6 8 10 12 14 3.8 4 4.2 4.4 4.6 4.8 5 5.2

LOW dielectric area (estimated HIGH air voids) HIGH dielectric area (estimated LOW air voids)

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GPR Dielectric-Air Void Relationship

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GPR Dielectric-Air Void Relationship

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GPR Dielectric-Air Void Relationship

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GPR Dielectric-Air Void Relationship

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Summary/Findings

  • Most Dominant Distress: Reflection of

Cracks

  • Improved Ride Quality
  • Improved Skid Resistance
  • Minor Rutting