SUPERPAVE

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SUPERPAVE

• FOR
• LOCAL ROADS
• LOW VOLUME STATE HIGHWAYS

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PROBLEM STATEMENT

• ROADS MUST ACCOMODATE
• Extreme Temperatures High - 110FLow - minus
  40F
• EnvironmentMountains Snow and RainDeserts
  High Temperature
• Traffic Types
• Forest, Agriculture, Mineral Hauling/Loads
• Recreational Traffic
• Buses and Heavy Trucks

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FLEXIBLE PAVEMENTSGOVERNING DISTRESSES FOR

• STATE ROADS
• COUNTY ROADS
• CITY ROADS

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Governing Distress TypesFor State Roads (ADT lt
5000)
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Governing Distress TypesFor County Roads
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Governing Distress Types
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STUDY OBJECTIVE

• Implement SHRP Superpave technologies and
  evaluate use performance on local streets and
  low volume state and county roads.

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STUDY TASKS

• Organize Technical Working Group
• Coordinate work with the Rocky Mountain Asphalt
  User/Producer Group
• Develop Standard Binder Asphalt mix design
  criteria for streets roads
• Evaluate mixes (SHRP protocol level 1)
• Construct Experimental Pavement Sections
  Evaluate Performance
• Prepare Design Construction Reports
• Conduct Periodic Condition Surveys Prepare
  Performance Reports

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Expected Benefits

• Cost Savings
• Increased Pavement Life
• Improved Service to Road User

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TWG- Technical Working Group

• State DOT

County
Asphalt Institute
City/Town
RMAUPG
Contractors
Materials/Suppliers
Consultants
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Superpave Asphalt Mix Design Criteria(Level I
Mix Design)

• Residential Streets
• County Roads/ Low Volume State Roads
• Collector Arterial Streets (i.e. Buses)
• Industrial Areas

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Selection of Materials

• Asphalt Cements (Hi - Low Temp Map for State)
• PG 64-28
• PG 64-34
• PG 64-40
• PG 70-28
• Aggregates (Max. Size)
• 19mm / ¾ inch
• 12mm / ½ inch

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Mix Design Criteria
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Ogden CITYSuperpave Projects

• FIRST PROJECT 1997
• OVERLAY PROJECTS 1998 - 2000

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Ogden City - Projects

• RECONSTRUCTION
• Superpave Level I Mix Design
• PG-64-28 Asphalt Cement
• 3 inches of HMA
• 19mm (3/4 inch) max. size aggregate

• OVERLAYS
• Superpave Level I Mix Design
• PG-64-28 Asphalt Cement
• Partial roto-mill of existing surface.
• Non-woven fabric
• 2 inches HMA

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Ogden - Reconstruction of 34 th Street

• Superpave Level I Mix Design Required.
• PG-64-28 Asphalt Cement selected.
• Mix design validated by UDOT.
• Pavement Structure
• 3 inch HMA surface
• 8 inch crushed aggregate base

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34 th Street Jefferson to Washington
Reconstructed- 1997 3 in. HMA 19 mm max.
aggr. Asphalt PG-64-28

• Condition Rating

3459
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Henderson Avenue
Costructed 1999 2 in. HMA Overlay 12.5 mm max.
aggr. Asphalt PG 64-28

• Condition Rating

dcp01427
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25th Street from Taylor Avenue to Fillmore
Avenue constructed 1999
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Comparison of PW Overlays Superpave Overlays
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SALT LAKE CITY Superpave Projects
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Salt Lake City - Projects

• RECONSTRUCTION
• Superpave Level I Mix Design
• PG-64-28 or PG-70-28 Asphalt Cement
• 7 inches of HMA
• 19mm (3/4 inch) max. size aggregate

• OVERLAYS
• Superpave Level I Mix Design
• PG-64-28 Asphalt Cement
• Partial roto-mill of existing surface.
• Non-woven fabric
• 2.5 inches HMA

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2100 South - 1700 East to 2300 East
Reconstructed in two phases 1997 1998 7 in.
HMA 19 mm max. aggr. Asphalt Cement PG 70-28

• Condition Ratings

15,000 ADT 7 Trucks Buses 150 trips/day
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2100 South, 940 East to 1100 East
Constructed 2000 3 in. Overlay of PCCP 12.5 mm
max. aggr. Asphalt Cement PG 64-28

• Condition Ratings

15000 ADT
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9th Ave (E Street to F Street)
Constr. 2000 2.5 Overlay w fabric 12.5 mm max.
aggr. Asphalt Cement PG 64-28

• Condition Ratings

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Cheyenne St.- Wasatch to 800 South
Constr. 2000 2.5 in. Overlay w fabric 12.5 mm
max. aggr. Asphalt Cement PG 64-28

• Condition Ratings

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Concord - 300 South to 340 South
Constr. 2000 2.5 in. Overlay w fabric 12.5 mm
max. aggr. Asphalt PG 64-28

• Condition Ratings

600 ADT 60 bus trips per day
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Salt Lake City Summary

• Comparison
• 900 East 7 in. HMA
• AC-20
• ADT 14000
• 2100 South 7 in. HMA
• PG 70-28
• ADT 15000
• 900 East has 4 times more rutting than 2100 South

• Cost
• 2000 AC-20, ¾ HMA
• 1.31/sq./in.
• 2002 AC-20, ¾ HMA
• 1.50/sq./in.
• 15 increase in cost.
• 2000 PG 64-28, ½ HMA
• 1.55/sq./in.
• 2002 PG 64-28, ½ HMA
• 1.70/sq./in.
• 10 increase in cost.

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Other Experimental Projects

• Orem City
• 1200 South 400 West to Sandhill Road
• State Route 10
• Just North of Castledale between Reference Posts
  38.6 and 41.3
• State Route 30
• Park Valley

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City of Orem 1200th South 400 West to Sandhill
Road
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Orem Overview 0.5 Mile Section 1800 tons Close to
Utah Valley State College SHRP Level I Mix
Design 19mm PG 64-34
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Orem CitySHRP Level I Mix Design

• UDOT Central Materials Bituminous Mix Design
  Laboratory
• AMRL Accredited
• FHWA approved gyratory compactor
• Atsers Asphalt-it 6.0 design software

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Aggregate

• Geneva Rock Products
• Gradation modified to avoid restricted zone
• Fine aggregate angularity out of spec in one
  stockpile

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Binder SelectionWhy PG 64-34?

• City Setting - Dynamic loading
• Minimize thermal cracking
• Safety factor

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Paving Mixture

• 1 Lime - Antistrip
• Lower asphalt content longer mix times?

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1200 South Sandhill Rd. Reconstructed August
1997
Condition 1-24-03
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Condition Comparison
1-24-2003
1997
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1200 South Sandhill Rd. Reconstructed August
1997
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SR-10 Overview

• Project SP-0010(8)39
• Rotomill and Overlay - 1998
• Length 2.7 miles or 4.35 Kilometers
• 4,400 Metric Tons
• ADT 3235
• 19 mm PG 64-40 mix
• Average Remaining Service Life 3 years

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Original Condition
State Route 10 Ref Posts 38.6 - 41.3 North of
Castledale
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COAL TRUCK TRAFFIC SR- 10
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SR 10 Ref. Post 38.6 to 41.3

• Condition Rating

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SR-10 MP-38.67
July 2002
July2002
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SR 10 MP 39.07
July 2002
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Comparison
4-1-2000
10-9-02
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SR-30 Overview

• Project SP-0030(22)42
• HMA Overlay
• 19mm max. aggr.
• PG 64-34 asphalt cement
• Constructed 1998

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State Route 30 Park Valley
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Oil Graph
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Georgia Loaded Wheel Test
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SR- 30 MP 30
October 2001
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SR 30 MP 46
October 2001
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Condition Comparison
2001
1998
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Changes with Superpave

• Increased testing and specifications
• More coarse aggregate in mix
• Binders now engineered
• Binder specification based on temperature
  extremes

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SUPERPAVE COSTS

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Average Increase In Cost

• 2000 1.00/ton of mix(28.00 per ton)
• 2002 3.00/ton of mix
• (31.00 per ton)

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Lessons Learned Construction

• Must have solid foundation
• Requires Quality Construction Procedures
• Requires Additional Compactive Effort
• Tender Zone
• QC/QA a must
• Excellent Joint Construction

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Lessons Learned Performance

• On New or Total Reconstructed Pavements No
  Thermal Cracking After 5 Years
• Reduced Reflective Cracking for 2 inch Plus
  Overlays
• At Least 19mm(¾ inch) Maximum Size Aggregate
  Required for City Bus Traffic
• 12mm(½ inch) max. Size Aggregate Works Well for
  Overlays on Residential Streets
• Longitudinal Joint Construction has Been
  Excellent on Most All Projects.