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4/18/2019
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Tangible Local Agency Solutions for Pavement Preservation
Ryan Miles, PE
Street Operations Program ManagerCity of Vancouver
4/18/2019
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Presentation Overview
• Treatment selection
• Rehabilitation tools
• Preservation tools and lessons learned
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Pavement Management Objectives
• Extend the life of existing pavements over the entire network for as long as possible – “Take care of what we have”
• Right treatment, on the right street, at the right time
• Avoid worst-first strategies
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Condition Assessment
• Utilize some form of rating system− Pavement Condition Index (PCI) 0 – 100
− Pavement Serviceability Index (PSI) 0 – 5
− Simple visual rating (e.g. PASER) 0 - 10
• Routine/regular assessment
• Consistent and repeatable method
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Good
Condition Assessment
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Excellent Fair
FailedPoor
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Pavement Performance
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No Distress
Pave
men
t Con
ditio
n
Failed
Age (years)
Excellent
Pavement Performance
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No Distress
Pave
men
t Con
ditio
n
Failed
Age (years)
Fair
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Pavement Performance
9
No Distress
Pave
men
t Con
ditio
n
Failed
Age (years)
Failed
Pavement Performance
10
No Distress
Pave
men
t Con
ditio
n
Failed
Age (years)
Condition = f(Age)
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Treatment Selection
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Reconstruction
PreservationResurfacing(Rehabilitation)
$2-$12/SY
$20-$45/SY
$70-$100/SY
Pave
men
t Con
ditio
n In
dex
(PC
I)
Age (years)
Treatment Selection
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• Type of street
• Traffic volumes and impacts
• Previous treatments – when and what
• Types of pavement distress
• Coordination with other projects
Factors to consider:
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Rehabilitation Treatments
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• Mill and inlay
• Traditional overlays
• Pulverize and pave
• Fiber reinforced asphalt
• Cement treated base
Rehabilitation Treatments (cont’d)
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• $20 - $45/sy
• ADA curb ramps in advance
• Pavement repairs
• Deep mills in travel lanes
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Preservation Treatments
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• Slurry Seals
• Microsurfacing
• Chip Seals
• Cape Seals
• Bonded Wearing Course
• Other Treatments
Slurry Seals
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• Using since the late 90’s
• Residential streets only
• Joint contracts with other county agencies
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Slurry Seals (cont’d)
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• $2 - $3/sy• 8 to 10 year life
• Work when school is out
• Slurry only contract
Slurry Seal Lessons
• PCI > 70 • Prep is important• Traffic volumes
• Grouping of streets
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• Using since 2009
• Type 2 and Type 3 rock
• Arterials and collectors
• Continuous and truck mounted applications
Microsurfacing
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Microsurfacing (cont’d)
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• Type 2: $3 - $5/sy
• Type 3: $4 - $6/sy
• 7-8+ year life
• Prep work done by City crews
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• PCI > 70• Striping removal• Night work• Application
− Workmanship/Equipment
− Application rate
Microsurfacing Lessons
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Chip Seals
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• Started using in 2011
• Traditional emulsion chip seal
• 3/8” Asphalt rubber chip seals
• ¼” Chip seals (only in 2017)
• Fog seal all types
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Chip Seals (cont’d)
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• AR Chip: $4 - $7/sy
• ¼” Chip: $3 - $4/sy
• Emulsion chip: 6+ years
• AR Chips performing well to date− 5+ years
• ¼” Chip seals: too soon to tell
Chip Seals (cont’d)
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Chip Seals (cont’d)
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Chip Seals Lessons
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• PCI > 55
• Street prep
• Sweeping after placement
• Public perception
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Cape Seals
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• Started using in 2012
• 3/8” Asphalt rubber chip seal
• Either slurry (residential) or
microsurfacing (arterials)
Cape Seals (cont’d)
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• $8 - $12/sy− Slurry lower end
− Micro higher end
• Good performance to date− 6+ years
• Minimal prep
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Cape Seals (cont’d)
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Cape Seal Lessons
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• PCI > 50• Can go lower but streets need
more prep
• One contractor to do both treatments
• Don’t chip seal only next to cape seal in residential areas
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Bonded Wearing Course
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• Pilot project in 2018• Part chip seal and part overlay
• Oil application for sealing and bonding of surface
• Thin lift of asphalt for ride quality and durability
Bonded Wearing Course (cont’d)
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• $11 - $16/sy• Uses a gap/open graded asphalt
• Can be used in urban or rural areas with varying traffic loads
• Prep work still required
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Bonded Wearing Course Lessons
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• PCI > 55 - 60
• Best not to use with curb and gutter unless a true overlay
• Open graded asphalt mix reduces spray from water
• Adjust utilities after placement
Other Preservation Treatments
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• Crack sealing• Double chip seals
• Micro-chip-micro
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Other Preservation Treatments
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Ryan Miles, City of VancouverStreet Operations Program [email protected]
Questions and Discussion
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