Introduction to Pavement Preservation
Transcript of Introduction to Pavement Preservation
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Introduction to Pavement Preservation
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Asphalt Paving Systems
Who is Asphalt Paving Systems?
6 Locations:• Hammonton, New Jersey• Lehighton, Pennsylvania• Middle Island, New York• Tampa, Florida• Cocoa Beach, Florida• Savannah, Georgia
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Emulsion Mills
Hammonton, NJ Tampa, FL
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Definition of Pavement Preservation
Is a planned strategy that extends the
life of the pavement while it is still in
good condition. This provides a cost
effective solution for pavement
management.
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Where to start
ØThe objective is to maintain pavement condition such that corrective rehabilitation isn’t needed
ØEvaluate your overall road network and condition of the individual roads
ØDetermine which treatment would be correct for the road condition
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When Should Preservation Techniques be applied to Pavements?
Preservation Techniques should be applied when:
Ø Need waterproofing (cracks)ØSurface oxidation Ø Loss of surface frictionØMinor ruttingØ Loss of ride quality
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Life cycle extension based on preservation techniques
Treatment Life extension
Preventative
Slurry Seal 3 - 5 years
Chip SealHigh Performance Chip Seal
3 - 6 years5 - 8 years
Micro Surfacing – Single ApplicationDouble Application
5 - 8 years6 - 10 years
Cape Seal 6 - 10 years
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What is the proper time of year to Apply Preservation Techniques to Pavements?
Treatment DatesSlurry Seal May 1 to October 1
Chip Seal May 15 to September 15
High Performance Chip Seal May 15 to October 1
Micro Surfacing ( Applied Nighttime) June 1 to September 15
Micro Surfacing ( Applied Daytime ) May 1 to October 15
Cape Seal May 15 to October 15
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Preventative Maintenance: Chip Seal
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Preventative Maintenance: Chip Seal
This technique is to seal the pavement with an impermeable and skid resistant layer wearing course
Ø Application of asphalt emulsion followed by a uniformly graded aggregate Ø Corrects flushing/bleeding
ApplicationØ Single, double and seal combination. Various aggregate sizes are used
based on project requirements.Ø Can use polymer modified emulsions to increase performance and service
life (CRS-2PM)
PerformanceØ Medium term (3-6 years) dependant on traffic and weatherØ Wearing course for medium to low traffic levels.
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Preventative Maintenance: Chip Seal
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Ø Single Chip Seal
Ø Double Chip Seal
Ø Cape Seal
Preventative Maintenance: Chip Seal
The Cape Seal process is when a Microsurfacing or Slurry seal application is placed over the Chip Seal.
micro surfacing
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High Performance Chip Seal
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High Performance Chip Seal
Process:
Application of Asphalt Rubber Binder followed by a uniformly graded precoated aggregate.
3/8 cubular aggregate is precoated with PG 64-22 Asphalt Binder at an approved asphalt facility and delivered to jobsite.
Provides Quicker Stronger aggregate chip adhesion
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High Performance Chip Seal
Application:Ø Apply Asphalt Rubber Binder to road surface at a temperature between
350-400 degrees Fahrenheit at a rate of .5 to .65 gallons per square yard.Ø Apply hot precoated aggregate immediately following Asphalt Rubber
Binder at a rate of 30 to 40 pounds per square yard.Ø Immediately roll with two pneumatic rollers in tandemØ Sweep excess aggregates after material has cooled
Performance:Ø Medium term (5-8 years) dependent on traffic and weatherØ Wearing course for medium to high traffic levels.
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High Performance Chip Seal
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High Performance Chip Seal
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High Friction Surface Treatment
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Preventative Maintenance: Microsurfacing/Slurry Seal
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Preventative Maintenance: Microsurfacing/ Slurry Seal
Microsurfacing/Slurry Seal is a calibrated mixture of:
ØPolymer-modified asphalt emulsionØType II & III gradations crushed aggregates ØMineral filler, (Portland cement or hydrated lime)ØWater ØOther chemical additives
These materials are then mixed and spread on the pavement surface by a specially designed paving machine
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Preventative Maintenance: Microsurfacing/Slurry Seal
§ Mixture Design
Ø Predictive model for successful application of the micro-surfacing mixture in the field
Ø Allows for anticipation of mixture performance characteristics as weather conditions fluctuate
Wet Track Abrasion Test
Wet Track Abrasion Test Wet Cohesion Test
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Preventative Maintenance: Microsurfacing/Slurry Seal
NJDOT Specifications:
• Microsurfacing – 18 to 22 lbs./SY
• Slurry – 16 to 20 lbs./SY
*Projects Specified as Slurry Seal are not required to conform to ADA upgrades.
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Preventative Maintenance: Microsurfacing/Slurry Seal
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Preventative Maintenance: DOT Nighttime application
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Preventative Maintenance: County Route Microsurfacing
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Preventative Maintenance: Residential Microsurfacing
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Microsurface/Slurry Seal
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Preventative Maintenance
What roads may be candidates for Preventative Maintenance Treatments?
Ø Low – medium severity distressesØ Proper structural capacityØ Highways & InterstatesØ Streets and RoadwaysØ State and Metro ParksØ Airport Runways and TaxiwaysØ Large Commercial and Industrial LotsØ Performance of 5-10 yearsØ Intermediate Course for Leveling/Binding
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Preventative Maintenance
Benefits using Microsurfacing and Chip Seals:
Ø Quick traffic, 1 hour or lessØ Minimizes traffic disruptions/user delayØ No utility adjustments Ø Cost effectiveØ Day or Night time placement Ø Improved Ride
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Preventative Maintenance
Industry enhancements in the last 15 years
Ø Materials Technology InnovationsØ Emulsifier TechnologyØ Engineered for adhesion, controlled break performanceØ Polymer TechnologyØ Advanced Equipment Technology
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Importance of Tack Coats
Good Tack Coat practices are imperative to achieve good pavement performance
Ø Selecting the appropriate materialØ Calibrating distributor to achieve proper application
rateØ Proper SamplingØ Surface must be clean and dryØMust be applied in a uniform and consistent sprayØMust be sprayed at specified temperatures
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Importance of Tack Coats
Material Application RateGal/per SY
Application Temperature (F)
Polymer Modified Tack Coat (Spray Jet Paver)
0.05 – 0.15 140 – 175
CSS-1 , CSS-1H 0.05 – 0.15 70 – 140
RS-1 , RS-1H (NJDOT) 0.05 – 0.15 125 – 185
High Performance Trackless
0.05 – 0.15 140 – 160
CRS-1 , CRS-1H (NJDOT) 0.05 – 0.15 125 – 185
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VOGELE Spray Jet Paver
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VOGELE Spray Jet Paver
Emulsion Spray nozzles
Emulsion àSpray nozzles
Heated Asphalt emulsion
storage tank
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VOGELE Spray Jet Paver
Polymer modified emulsion
High Performance Thin Overlay (HPTO)
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Conclusion
Ø One of the toughest parts of pavement preservation is to get the public understanding that roads in generally good condition needs treatment – Need to Break “Worst First Mentality”, approach to managing network
Ø If implemented correctly, surface treatments can provide better quality roads for longer, at reduced life cycle costs
ØAll of the pavement preservation techniques are considered a green construction method due to the limited amount of fuel and waste generated throughout construction
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Asphalt Paving Systems
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Questions?
Pavement Preservation