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FEATURE CORE INNOVATION AREA (CIA)
TEAM PRESENTATION:
Presented by:
Robert Blight
Supervising Engineer, NJDOT
Pavement & Drainage
Management
CIA TEAM
INFRASTRUCTURE
PRESERVATIONNJDOT – Bob Signora
FHWA – John Miller
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PAVEMENT PRESERVATION ON HIGH TRAFFIC VOLUME ROADWAYS – WHEN, WHERE & HOW?
NJ State Transportation Innovation Council (STIC) Summer Meeting, June13, 2018
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ACKNOWLEDGEMENTS
• Susan Gresavage, Executive Manager, NJDOT PDM&T
• Pavement & Drainage Management & Technology
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PAVEMENT PRESERVATION ON HIGH TRAFFIC VOLUME ROADWAYS –
WHEN, WHERE & HOW?• Combination of STIC Innovations
• Pavement Preservation (When and Where)
• Pavement Preservation (How)
• Guidelines for the Preservation of High-Traffic-Volume Roadways (R26)
• Small “Pieces” to larger “Puzzle” at NJDOT
• Asset Management
• Pavement Preservation Program
• 2004 - present
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PAVEMENT PRESERVATION PROGRAM
2000 - 2004
• “Worst First” Resurfacing Approach
• Used a hammer for most jobs
• Mill 2” Asphalt and Pave 2” Asphalt
• Not many “tools in the toolbox”
• No dedicated funding for “pavement preservation”
Where we started…
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NJDOT PAVEMENT PRESERVATION PROGRAM
2017 USDOT Finalized TAMP & PM Rules
2015 USDOT Refined AM (FAST) & NJDOT Increased Pavement Preservation Funding
2012 USDOT Initiated AM (MAP-21)(NHS)
2007 NJDOT Adopted AM (SHS) & Line Item for Pavement Preservation in STIP
2005 NCPP/FHWA Preservation Technical Appraisal
2004 NJDOT Merged Pavement Management with Pavement Design
2018 NJDOT TAMP submitted to FHWA
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PAVEMENT PRESERVATION ON HIGH-TRAFFIC-VOLUME ROADWAYS – WHEN,
WHERE & HOW?• NJDOT is headed in the right
direction
• Pavement Preservation Program is very robust!!
• The 3 STIC initiatives assist with
• Documentation
• Benchmarking
• Evaluation/Analysis
• Making some improvements
• Training
• Validation
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NJDOT PAVEMENT PRESERVATION AND ASSET MANAGEMENT
• Economy of Pavement Preservation
• Pavement management system recommends $100M+ annual preservation program
Condition Treatment Treatment Life Cost
Good-FairPavement
Preservation5-10+ years $75-250K/LM
Fair-PoorMinor Rehab &
Resurfacing10+ years $300-350K/LM
PoorMajor Rehab &
Reconstruction10+ years $750K-1M+/LM
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Major Rehab &
Reconstruction
Minor Rehab &
Resurfacing
Preservation &
Preventive
Maintenance
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Good16%
Fair31%
Poor53%
NJDOT Pavement Condition 2008
Good35%
Fair32%
Poor33%
NJDOT Pavement Condition 2016
Good = IRI < 95 and SDI > 3.5 Poor = IRI > 170 or SDI < 2.4 Fair = Everything in between
Preservation Candidate Pool
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PRESERVATION PROJECT SELECTION
• Time based (4-8 year window)
• Assess condition and performance
• Select specific preservation treatment based on
• Road type
• Condition
• Traffic volumes
• Other unique project characteristics
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$3.10 $4.00$0.00
$2.40$5.69
$9.24
$17.07
$53.93
$36.50
$87.16
$0
$10
$20
$30
$40
$50
$60
$70
$80
$90
$100
2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
Mil
lio
ns
Fiscal Year
NJ State Highway SystemAnnual Preventive Maintenance Pavement Investment
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0 027 30 0 38
80
132
225
331
192
443459
605595
623
511459
653
494
309
591
311
705
459
605622 653
511 497
733
626
534
922
503
1148
0
200
400
600
800
1000
1200
1400
2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017
Lan
e M
iles
Fiscal Year
NJ State Highway SystemLane Miles of Major Pavement Work Completed
(Total System Mainline Lane Miles = 8542)
Preventive Maint
Resurf/Rehab/Recon
Total Pavement Work
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2018 Preventive Maintenance
Investment = $107 million
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HIGH PERFORMANCE THIN OVERLAY (HPTO)
• “Work Horse” of preservation program
• Applicable for NJ highest ADT roadways
• 1 inch thick Surface Course
• High quality 4.75mm NM Aggregate
• Polymer modified asphalt binder PG 64-22E or better
• Can be used for leveling when required in lifts 0.5 inch to 1.5 inch thick
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WHAT IS HPTO?
• HPTO must meet
mixture performance
requirements
• Texas Overlay Crack
Tester
• Cycles > 600 in OT
• Asphalt Pavement
Analyzer Rut Tester
• Rut < 4mm in APA
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HPTO PAY ADJUSTMENTTable 902.08.03-1 Performance Testing Pay Adjustments for HPTO
Test Requirement Test Result PPA
APA @ 8,000 loading cycles, mm
(AASHTO T 340)
5.0 maximum t ≤ 5.0 5.0 < t ≤ 12.0
t > 12.0
0 -50(t-5)/7
-100 or Remove & Replace
Overlay Tester, cycles
(NJDOT B-10)
600 minimum t ≥ 600
600 > t ≥ 400 t < 400
0
-(600-t)/4 -100 or Remove & Replace
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HPTO ADVANTAGES
• Can improve ride quality (IRI) significantly
• Seals out water
• Renew road surface
• Quick open to traffic
• Minimal to zero RAP
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HPTO ADVANTAGES
• Placed with a conventional paver or ultra-thin paver
• Excellent life extension (12+ years) = durability• Mill 2” pave 2” w/ HMA = 8 years
average life
• Low tire noise
• Improves skid resistance (SN = 50)
• Applicable to all roadways
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ULTRA-THIN FRICTION COURSE (UTFC)
• ¾ inch thick Thin Bonded Hot Mix
Asphalt (HMA) Overlay
• Like Novachip (but not proprietary)
• 4.9 – 6.0 % polymer modified (PG 64E-
22) asphalt binder
• Volumetric Mix Design Requirements
• 9.5 mm nominal maximum size high
quality aggregate
• Gap/open graded HMA
• Flakiness Index (cubicle aggregate)
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WHAT IS UTFC?
• Constructed with ultra-thin
paver
• Spray paver
• Self priming paver
• Polymer Modified
Emulsified Asphalt Tack
Coat
• CRS – 1P
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ULTRA-THIN FRICTION COURSE VIDEO
Link for video
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ULTRA-THIN FRICTION COURSE
• Benefits:
• Improvement in ride quality
• Improves wet weather skid resistance/spray
• Seals out water
• Renew road surface
• Quick open to traffic (300 feet!!)
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ULTRA-THIN FRICTION COURSE
• Benefits:
• Minimal milling = minimal to zero rap
• Placed with spray paver• Ensures superior bond with
existing pavement
• No tracking tack coat by HMA trucks!!
• Great performance when designed and constructed properly (Rt.195 WB, 2000)
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MICRO-SURFACING AND SLURRY SEAL
Cold applied mixture of:
• Polymer modified asphalt emulsion (CQS-1hP)
• SB, SBS, SBR or natural latex
• High quality aggregate
• Mineral filler
• Water
• Additives
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MICRO-SURFACING AND SLURRY SEAL
• Capable of being spread in variable cross-sections:
• Wedges
• Ruts
• Longitudinal joints – micropaving joints
• Scratch or intermediate layer
• Surface treatment
• Typically applied at 20 lbs/SY aggregate + 0.35 gallons/SY asphalt emulsion
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MICRO-SURFACING AND SLURRY SEAL
• A System – high quality aggregate and emulsion compatibility and consistency is vital
• Should maintain a skid-resistant surface (high wet friction coefficient)
• Type 2 (ISSA)
• ¼” nominal maximum aggregate size
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MICRO-SURFACING/SLURRY EQUIPMENT
• Types:
• Truck mounted
• Continuous paver
• Mixing Equipment
• Proportioning Devices
• Spreading Equipment
• Support equipment
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MICROPAVING LONGITUDINAL JOINTS
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MICRO-SURFACING AND SLURRY SEAL
• Benefits:
• Maintains existing ride quality
• Improves skid resistance
• Seals out water
• Renew road surface
• Quick open to traffic
• Minimal to zero rap
• 25-40% of the cost to mill and pave
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CHIP SEAL• Asphalt binder application
• 0.40 – 0.65 gallons/SY
• Polymer modified asphalt emulsion
• Crumb rubber modified
• High quality aggregateapplication immediately following the asphalt binder
• 6.25 – 9.5 mm (1/4 - 3/8 inch) aggregate size
• Clean and cubicle
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CHIP SEALAsphalt “Glue” + Stone “Chip” Compaction “Seating”
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CHIP SEAL – VACUUM SWEEPING
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CHIP SEAL
• Benefits:
• Maintains ride quality but no improvement
• Seals out water
• Durable
• Fast renewal road surface
• Quick open to traffic
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CHIP SEAL
• Benefits:
• Improves skid resistance
• Minimal to zero rap
• Ease of construction
• Historically the mostcost effective thin overlay treatment
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FOG SEAL
• Mixture of asphalt emulsion and water
• SS-1h, CSS-1h, or CQS-1h
• Other proprietary products available
• Applied with asphalt distributor (0.06-0.10 gallons/SY)
• Higher application rates with light sand
• Light sand application (0.25 to 0.5 lbs./sy)
• Skid resistance
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FOG SEAL
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FOG SEAL WITH LIGHT SANDING
• RE should base acceptance on visual inspection
• Proper coverage
• Fog seal emulsion
• Sand
• Random sampling and testing of emulsion
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FOG SEAL
• Benefits:
• Maintains ride quality but no improvement
• Seals out water
• Preserves surface
• Quick open to traffic
• Zero RAP
• Pennies on the dollar
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MICRO-MILLING
• Finest milling available = Ideal for Thin Preservation Treatments
• Maintain elevations where necessary• Transitions for thin overlays -
beginning and end of treatment
• Bridge approaches• Bridge vertical under-
clearance
• Ride quality improvement
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MICRO-MILLING
• RE acceptance based on
• Texture depth using sand patch test (ASTM E 965)• 4mm maximum allowable
• Visual inspection
• Ride quality if micro-milling will be final riding surface
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QUALITY MICRO-MILLING
• Provides better bonding for thin preservation treatments
• Smoothest surface of milling
• Can be used as a final riding surface
• Ideal milling for thin preservation treatments
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SUCCESSES+CHALLENGES+OPPORTUNITIES= LESSONS
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LESSONS LEARNED
• Weather Limitations
• 50-60°F and rising
• Dry pavement with no precipitation forecasted
• Limitations to some thin surface treatments
• Slurry seal, micro-surfacing, chip seal, fog seal (cape seal?)
• May not be suitable for some high traffic volume, truck traffic, turning movements
• Higher tire noise than HMA
• No ride quality improvement
• Customer satisfaction??
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LESSONS LEARNED
• Initial appearance may be very “shiny”
• High asphalt content mixtures = durability
• Skid resistance may initially be low
• Will improve after a few months of traffic
• Light sand application has been used to improve skid
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LESSONS LEARNED
• Some treatments may slightly impact roadway geometry
• HPTO, UTFC, Cape Seal require ADA compliance
• Micro-milling required in floodway at affected stream crossings (no fill)
• Resetting, recasting, and reconstructing inlets and manholes, curb and driveways as needed
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LESSONS LEARNED
• Micro-milling quality critical
• Removal of all unsound material
• Bond is critical for ALL thin overlays
• tack coat spec. needs updating
• Construction sampling in progress
• Some ultra-thin paver HPTO projects next year
• Trackless tack coat
• Bond/shear/pull test study in progress
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LESSONS LEARNED
• Treatments in combination working very well
• Thin HMA overlay over slurry seal• HPTO over slurry seal
• UTFC over slurry seal
• Cape seal = slurry seal over chip seal (SHRP 2 R26 best performance)
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LESSONS LEARNED
• Specifications a work in progress
• Constantly improving materials specifications• HPTO rutting issues
• UTFC aggregate
• Constantly improving construction practices
• Maintenance bond?• Considering it
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LESSONS LEARNED - HPTO
• HPTO = Best Performance = Most frequently used preservation treatment
• Performance – Rutgers preliminary performance study shows that treatment timing is critical
• SDI < 2.4 = 5 years service life
• SDI > 2.4 = 13+ years service life
• Good performance on composite pavements
• Composite is approx. 60% of network
• HPTO = Reflective Crack Resistant
• Used in combination with slurry seal scratch course
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Surf
ace
Dis
tres
s In
dex
(SD
I)
Yrs After Construction
HPTO SDI > 2.4
HPTO SDI < 2.4
HMA Mill 2"/Pave 2"
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LESSONS LEARNED - UTFC
• Aggregate shape and gradation is critical to success
• Improper aggregate = premature failure
• Aggregate crushing operation is critical
• Refined specification to more clearly indicate mix design requirements
• Tack coat bond is critical
• Under application or poor coverage = premature failure
• Improper tack coat material = premature failure
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LESSONS LEARNED
• Overall thin overlay treatments are performing as well as or better than mill 2” + pave 2” HMA
• Pavement condition must = FAIR/GOOD condition for preservation
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CHALLENGES/THREATS
• Agency• Staffing, training/knowledge gap• Lack of quality assurance
• Design• Retool for quicker delivery• Better manage SOW (Environmental,
ADA, Safety/Guiderail, ITS)• Document/Guidance - Right
treatment on right road
• Industry• Build industry capabilities, comfort,
capacity• Resistance to change• Lack of quality control
• Manage Customer Expectations• Public Outreach and Communication• Treatment failures
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LESSONS LEARNED
“Right Mix, On the Right Road, At the Right Time, for
the Right Cost”
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WHY PAVEMENT PRESERVATION?
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THANK YOU!QUESTIONS?ROBERT BLIGHT, SUPERVISING [email protected]
NJDOT Pavement & Drainage Management & Technology Team