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

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 • Field Performance 2

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 3

Mix Design Lab Performance 4

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 5

Performance Evaluation - HWTD Specimens under water Test Temperature: 50ºC 20,000 Passes 50 Passes per minute 158-lb load 6

Performance Evaluation - HWTD Thin Asphalt Overlay Project Hamburg Wheel Tracking Tests - 8/23/2012 6 1 st Pilot Project – SR 0022 5 Right Track 4 Rut Depth, mm Left Track 3 2 Temperature = 50ºC 1 0 0 2 4 6 8 10 12 14 16 18 20 Number of Wheel Passes (X1000) 7

Performance Evaluation – Texas Overlay Tester 8

Performance Evaluation – Overlay Tester Cycles to failure > 500 Good Performance 9

Tack Coat Evaluation Trimmed Core Direct Shear Mold Schematics 10

Tack Coat Evaluation Shear Strength = 44.5 psi (307 KPa) - Good Performance THMAO Project Tack Coat Evaluation - Core # 5 350 Deformation Rate: 1 mm/min Interface Shear Stress, KPa 300 Test Temperature: 25.5 C 250 200 150 100 50 0 0 1 2 3 4 5 Interface Shear Deformation, mm 11

Field Performance 12

SR 0022 13

SR 0022 – 26 Months 14

SR 0022 15

SR 230 – Finished Overlay 16

SR 230 – 16 Months 17

SR 230 – 16 Months 18

SR 230 – 16 Months 19

SR 220 – Existing Sealed Pavement 20

SR 220 – Micro-milling 21

SR 220 – 13 Months 22

SR 220 – 13 Months 23

SR 220 – 13 Months 24

Skid Resistance Results 25

Friction Improvement Data: Courtesy of PennDOT BOMO 26

Friction Improvement Data: Courtesy of PennDOT BOMO 27

Friction Improvement Data: Courtesy of PennDOT BOMO 28

Ride Quality (Smoothness) Improvement SR 0022 - N. Cameron Rd Segment 330, Eastbound 160 140 120 100 IRI, in/mile 80 60 40 20 0 Travel - Left Travel - Left Passing - Left Travel - Right Travel - Right Passing - Right April 2012 - Prepave July 2012 - Patched Data: Courtesy of PennDOT BOMO September 2012 - Post Paving November 2013 - 16 Months 29 June 2014 - Two Years September 2014 - 26 Months

Ride Quality (Smoothness) Improvement SR230 Segment 280, Eastbound 250 200 150 IRI, in/mile 100 50 0 Travel - Left Travel - Left Passing - Left Travel - Right Travel - Right Travel - Right May 2013 - Prepave July 2013 - after Paving 30 June 2014 - One Year September 2014 -15 Months

Ride Quality (Smoothness) Improvement 31

Ride Quality (Smoothness) Improvement SR 0022 - N. Cameron Rd Segment 340, Eastbound 180 160 140 120 100 IRI, in/mile 80 60 40 20 0 Travel - Left Travel - Left Passing - Left Travel - Right Travel - Right Passing - Right April 2012 - Prepave July 2012 - Patched Data: Courtesy of PennDOT BOMO September 2012 - Post Paving November 2013 - 16 Months 32 June 2014 - Two Years September 2014 - 26 Months

Ride Quality (Smoothness) Improvement SR 220, Segment 10 Northbound 90 80 70 60 50 IRI, in/mile 40 30 20 10 0 Travel - Left Travel - Left Passing - Left Travel - Right Travel - Right Passing - Right June 2013 - Prepave November 2013 - Paved 33 June 2014 - 9 Months September 2014 - One Year

Ride Quality (Smoothness) Improvement SR 220, Segment 50 Northbound 100 90 80 70 60 IRI, in/mile 50 40 30 20 10 0 Travel - Left Travel - Left Passing - Left Travel - Right Travel - Right Passing - Right June 2013 - Prepave November 2013 - Paved 34 June 2014 - 10 months September 2014 - One Year

Rut Measurements 35

Rutting, SR 230 SR230 Eastbound, 900 ft. Octobber 15, 2014 2.5 2.0 ≈ 1/8” Meaured Depth, mm 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 325 300 275 250 225 200 175 150 125 100 75 50 25 0 36

Rutting, SR 220 ≈ 1/10” SR 220, Passing Lane, Control Section, 600 ft. Octobber 8, 2014 1.5 1.0 0.5 Meaured Depth, mm 0.0 325 300 275 250 225 200 175 150 125 100 75 50 25 0 -0.5 -1.0 -1.5 37

Rutting, SR 0022 N Cameron St WB Travel Lane, 300 ft. October 23, 2014 5 Vertical Depth Measurement, mm 4 3 2 1 0 -1 -2 -3 325 300 275 250 225 200 175 150 125 100 75 50 25 0 Distance, cm 38

Ground Penetrating Radar AID Integrated Testing Vehicle Courtesy of Advanced Infrastructure Design, Inc. Can GPR provide a reliable estimate of mat density? 39

Air Coupled GPR 40

Dielectric Distribution Map 14 5.2 5 12 Distance from Edge (ft) 4.8 10 4.6 8 4.4 6 4.2 4 4 2 3.8 400 600 800 1000 1200 1400 1600 1800 2000 Distance from Start (ft) LOW dielectric area (estimated HIGH air voids) HIGH dielectric area (estimated LOW air voids) 41

GPR Dielectric-Air Void Relationship 42

GPR Dielectric-Air Void Relationship 43

GPR Dielectric-Air Void Relationship 44

GPR Dielectric-Air Void Relationship 45

Summary/Findings  Most Dominant Distress: Reflection of Cracks  Improved Ride Quality  Improved Skid Resistance  Minor Rutting 46