Update on Performance of Thin Asphalt Overlays
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1 Update on Performance of Thin Asphalt Overlays Pennsylvania Asphalt Pavement Association 55 th Annual Conference Mansour Solaimanian Penn State University 1
2 Outline Thin Asphalt Overlay Pilot Projects Mix Design/Lab Performance Field Performance 2
3 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
4 Mix Design Lab Performance 4
5 6.3 mm NMAS Mix Placed at 1 inch thickness Aggregate: Skid Resistance Level (SRL): E Polymer Modified Binder: PG Gyration Level: 75 Design Air Void: 4%, Min. Design VMA: 17 Design Binder Content: 6.7%; 7.0%; 6.9% NO RAP 5
6 Performance Evaluation - HWTD Specimens under water Test Temperature: 50ºC 20,000 Passes 50 Passes per minute 158-lb load 6
7 Rut Depth, mm Performance Evaluation - HWTD 6 5 Thin Asphalt Overlay Project Hamburg Wheel Tracking Tests - 8/23/ st Pilot Project SR Right Track 3 Left Track 2 1 Temperature = 50ºC Number of Wheel Passes (X1000) 7
8 Performance Evaluation Texas Overlay Tester 8
9 Performance Evaluation Overlay Tester Cycles to failure > 500 Good Performance 9
10 Tack Coat Evaluation Trimmed Core Direct Shear Mold Schematics 10
11 Interface Shear Stress, KPa Tack Coat Evaluation Shear Strength = 44.5 psi (307 KPa) - Good Performance THMAO Project Tack Coat Evaluation - Core # 5 Deformation Rate: 1 mm/min Test Temperature: 25.5 C Interface Shear Deformation, mm 11
12 Field Performance 12
13 SR
14 SR Months 14
15 SR
16 SR 230 Finished Overlay 16
17 SR Months 17
18 SR Months 18
19 SR Months 19
20 SR 220 Existing Sealed Pavement 20
21 SR 220 Micro-milling 21
22 SR Months 22
23 SR Months 23
24 SR Months 24
25 Skid Resistance Results 25
26 Friction Improvement Data: Courtesy of PennDOT BOMO 26
27 Friction Improvement Data: Courtesy of PennDOT BOMO 27
28 Friction Improvement Data: Courtesy of PennDOT BOMO 28
29 IRI, in/mile Ride Quality (Smoothness) Improvement 160 SR N. Cameron Rd Segment 330, Eastbound Travel - Left Travel - Right Passing - Left Passing - Right April Prepave September Post Paving June Two Years Data: Courtesy of PennDOT BOMO 29 July Patched November Months September Months
30 IRI, in/mile Ride Quality (Smoothness) Improvement 250 SR230 Segment 280, Eastbound Travel - Left Travel - Right Passing - Left Travel - Right May Prepave June One Year 30 July after Paving September Months
31 Ride Quality (Smoothness) Improvement 31
32 IRI, in/mile Ride Quality (Smoothness) Improvement 180 SR N. Cameron Rd Segment 340, Eastbound Travel - Left Travel - Right Passing - Left Passing - Right April Prepave September Post Paving June Two Years Data: Courtesy of PennDOT BOMO 32 July Patched November Months September Months
33 IRI, in/mile Ride Quality (Smoothness) Improvement 90 SR 220, Segment 10 Northbound Travel - Left Travel - Right Passing - Left Passing - Right June Prepave June Months November Paved 33 September One Year
34 IRI, in/mile Ride Quality (Smoothness) Improvement 100 SR 220, Segment 50 Northbound Travel - Left Travel - Right Passing - Left Passing - Right June Prepave June months 34 November Paved September One Year
35 Rut Measurements 35
36 Meaured Depth, mm Rutting, SR 230 SR230 Eastbound, 900 ft. Octobber 15, /
37 Meaured Depth, mm Rutting, SR 220 1/10 SR 220, Passing Lane, Control Section, 600 ft. Octobber 8,
38 Vertical Depth Measurement, mm Rutting, SR 0022 N Cameron St WB Travel Lane, 300 ft. October 23, Distance, cm
39 Ground Penetrating Radar AID Integrated Testing Vehicle Courtesy of Advanced Infrastructure Design, Inc. Can GPR provide a reliable estimate of mat density? 39
40 Air Coupled GPR 40
41 Dielectric Distribution Map Distance from Edge (ft) Distance from Start (ft) LOW dielectric area (estimated HIGH air voids) HIGH dielectric area (estimated LOW air voids) 41
42 GPR Dielectric-Air Void Relationship 42
43 GPR Dielectric-Air Void Relationship 43
44 GPR Dielectric-Air Void Relationship 44
45 GPR Dielectric-Air Void Relationship 45
46 Summary/Findings Most Dominant Distress: Reflection of Cracks Improved Ride Quality Improved Skid Resistance Minor Rutting 46
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