Chapter 7 Chip Seal
Transcript of Chapter 7 Chip Seal
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Chapter 7Chip Seals
From… Maintenance TechnicalAdvisory Guide (MTAG)
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Managers’ Overview
From… Maintenance TechnicalAdvisory Guide (MTAG)
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Chip Seal
What is Chip Seal?Why use Chip Seal?When to use Chip Seal? Where to use Chip Seal?Chip Seal Variations
Chapter 7 – Chip Seals
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What is Chip Seal?Application of asphalt binder on existing pavement followed by a layer of aggregate chips. The treatment is then rolled to embed the aggregate into the binder.
Chapter 7 – Chip Seals
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Why to Use - Performance and CostPerformance• Typical treatment life: 5 to 10 years• Function of climate, existing pavement condition,
traffic, type of chip sealAverage cost• $2.50 to $5.00/yd2 (depending on oil price)
Chapter 7 – Chip Seals
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Where and When to Use
Surface for light to medium traffic (ADT<30,000)Waterproof layerSkid resistant surfaceSeal the surfaceAddress bleedingTemporary base course coverDefine shoulders
Chapter 7 – Chip Seals
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When NOT to Use!Structurally deficient pavementsCracks >1/4 in width unless sealedLarge number of potholesRutting >1/2 inRide quality needs significant improvement
Chapter 7 – Chip Seals
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Keys for Success
Proper surface preparationUse the right binder and clean aggregatesFollow the construction specs, including the need for traffic controlChip seal in good weather conditions
Chapter 7 – Chip Seals
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Sweeping (before and after)Sweeping (before and after)
RollingRollingAggregate Aggregate ApplicationApplication
Binder Binder ApplicationApplication
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Chip Seal VariationsApplications• Single chip seals• Double or triple chip seals• Cape seals• Fabric and chip seals• Scrub seals
Asphalt Binder Types• PME• PMA• AR
Chapter 7 – Chip Seals
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Chip Seal VariationsSingle Chip Seals
Existing Pavement Binder
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Chip Seal VariationsDouble Chip Seals
Second BinderApplication
Existing Pavement Binder
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Chip Seal VariationsCape Seals
Slurry Seal
Existing Pavement Binder
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Chip Seal VariationsFabric and Chip Seals
Slurry Seal
Existing PavementTackCoat
Paving Fabric
BinderApplication
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Chip Seal VariationsFabric and Chip Seals
Chapter 7 – Chip Seals
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Chip Seal CourseTraining Modules Available
1. Design, Materials & Specifications
2. Construction, QC & Trouble Shootings
Chapter 7 – Chip Seals
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Module 7-1
Design, Materials & Specifications
From… Maintenance Technical
Advisory Guide (MTAG)
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Topics to be covered
Chip Seal Design ProcessDesign Considerations - Quantity SelectionChip Seal Design MethodsMaterial Selection – Binder and Aggregate
Chapter 7 – Chip Seals
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Chip Seal Design Process
Assess existing pavement• Based on Traffic, climate (add table 7-2)
Select compatible binder and aggregateDetermine quantity
Chapter 7 – Chip Seals
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Determine Quantity
Residual asphalt content• Asphalt cement factor = 1.0• Emulsion factors range = 0.65 to 0.70
Aggregate application rate• Single chip layer• No more than 10% excess chips• 70% embedment recommended
Chapter 7 – Chip Seals
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Chip Seal Design Methods
McLeod procedureAsphalt Institute method
Chapter 7 – Chip Seals
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Asphalt Institute Method
1. Determine aggregate size and specific gravity
2. Aggregate and binder quantities from table
3. Adjust aggregate (if necessary)4. Adjust asphalt content based on
condition of road (if necessary)
Chapter 7 – Chip Seals
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Material Selection - Binder
Chapter 7 – Chip Seals 2-4.25
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Material Selection - Binder
Polymer-modified emulsionsPolymer-modified binderPolymer-modified rejuvenating emulsions (PMRE)Asphalt Rubber
Chapter 7 – Chip Seals
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Material Selection -Emulsion Ingredients
AsphaltWaterEmulsifying agent (surfactant)
Chapter 7 – Chip Seals
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Material SelectionAsphalt Rubber Chip Seal
Chapter 7 – Chip Seals 2-4.28
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Binder MaterialField Blended (min. 45 minutes and viscosity 1,500 cps-4,000) hot asphalt, extender oil, crumb rubber, and high natural.
AR binder application is usually .60 gal / square yard through an agitated distributor truck attached with a vapor recovery system.
AggregateChips are always hot pre-coated, and applied at 35-40 lbs. per square yard
Asphalt Rubber Chip Seals
Chapter 7 – Chip Seals
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Asphalt Rubber Chip Seal
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Polymer Modified Asphalt Chip Seals
BinderTerminal Blended using hot asphalt, polymer and can use crumb rubber.
Application rate is 0.35 - 0.50 gals/sy depending on size of chip
ChipsChips can be 3/8” up to 1/2” (25-35 lbs. / sy)
Chips are required to be pre-coated and heated
Chapter 7 – Chip Seals
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PolymerModified EmulsionChip Seals
Crack Seal before PM Emulsion Seal
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PMRE Scrub Seal
BinderPolymer modified emulsion with a solvent free rejuvenating agent additive
Application rate is 0.25 - 0.40 gals/sy depending on size of chip and degree of cracking.
ChipsChips can be 1/4” up to 1/2” (18-35 lbs. / sy)
Can be applied at temperatures down to 40o F
Crack filling is not required
Chapter 7 – Chip Seals
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Material Selection - Aggregates
Clean and durableOne size: 6 to 16 mm (0.25 to 0.6 in)Cubical shapeFlat and elongated particles limited to 25 to 30 percentFines limited to 1 to 2 percent
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Material SelectionProblem With Flat Aggregates
Existing Pavement Binder
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Module 7-2
Construction and Inspection
From… Maintenance Technical
Advisory Guide (MTAG)
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Topics to be covered
Construction Procedures
Quality Control
Inspection
Troubleshooting
Chapter 7 – Chip Seals
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ConstructionConstruction
Chapter 7 – Chip Seals 2-4.40
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Construction - Conventional Chip Seal Procedure
1. Clean existing pavement2. Apply binder3. Spread aggregate4. Roll5. Allow binder to cure or cool6. Broom loose aggregate7. Apply a flush coat
Chapter 7 – Chip Seals
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Construction - Cleaning Existing Pavement
Chapter 7 – Chip Seals
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Construction - Start and Stop Application on Mat
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Construction - Binder Application
Chapter 7 – Chip Seals
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Construction - Binder Overlap
Spray Bar and Nozzles
Single Overlap hh
Roadway SurfaceDouble OverlapRoadway SurfaceTriple OverlapRoadway Surface
h
Chapter 7 – Chip Seals
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Construction - Binder ApplicationOverlap
Triple OverlapTriple Overlap
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Construction - Binder Application
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Construction - Aggregate Application
Chapter 7 – Chip Seals
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Construction - Aggregate Application
Chapter 7 – Chip Seals
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Construction - Rolling
Immediate rolling of aggregatePneumatic-tired rollersNo fewer than three passesFull coverage necessary before asphalt cures or cools
Chapter 7 – Chip Seals
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Construction - Rolling
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Construction - Rolling
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Construction - Curing of Emulsion
Time depends on temperature and relative humidityEmulsion break should begin just after first roller passOpen to traffic in about 2 hours
Chapter 7 – Chip Seals
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Construction – Cooling of Hot Binder
Time depends on temperature and relative humidityBinder should be cured prior to open to traffic. Time frame is more like 3 to 6 hours depending on climatic conditions
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Construction - Brooming Loose Aggregate
Chapter 7 – Chip Seals
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Quality Control - Preliminary Responsibilities
Project reviewDocument reviewMaterial checks
Chapter 7 – Chip Seals
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Quality Control - Pre-Application Inspection
Surface preparationEquipment inspection• Asphalt distributor• Chip spreader• Haul trucks• Rollers• Brooms
Chapter 7 – Chip Seals
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Quality Control - Pre-Application Inspection (cont.)
Weather requirementsDetermining application ratesChecking application ratesTraffic control plan and setup
Chapter 7 – Chip Seals
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Quality Control - Project Inspection
Asphalt applicationAggregate applicationTruck operationRollingLongitudinal jointsTransverse jointsBrooming
Chapter 7 – Chip Seals
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Quality Control - Post-Application Inspection
CleanupOpening to traffic
Chapter 7 – Chip Seals
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Quality Control - Preliminary Responsibilities
Project reviewDocument reviewMaterial checks
Chapter 7 – Chip Seals
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Quality Control - Pre-Application Inspection
Surface preparationEquipment inspection• Asphalt distributor• Chip spreader• Haul trucks• Rollers• Brooms
Chapter 7 – Chip Seals
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Quality Control - Pre-Application Inspection (cont.)
Weather requirementsDetermining application ratesChecking application ratesTraffic control plan and setup
Chapter 7 – Chip Seals
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Quality Control - Project Inspection
Asphalt applicationAggregate applicationTruck operationRollingLongitudinal jointsTransverse jointsBrooming
Chapter 7 – Chip Seals
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Quality Control - Post-Application Inspection
CleanupOpening to traffic
Chapter 7 – Chip Seals
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Quality Control - Preliminary Responsibilities
Project reviewDocument reviewMaterial checks
Chapter 7 – Chip Seals
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Quality Control - Pre-Application Inspection
Surface preparationEquipment inspection• Asphalt distributor• Chip spreader• Haul trucks• Rollers• Brooms
Chapter 7 – Chip Seals
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Quality Control - Pre-Application Inspection (cont.)
Weather requirementsDetermining application ratesChecking application ratesTraffic control plan and setup
Chapter 7 – Chip Seals
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Quality Control - Project Inspection
Asphalt applicationAggregate applicationTruck operationRollingLongitudinal jointsTransverse jointsBrooming
Chapter 7 – Chip Seals
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Quality Control - Post-Application Inspection
CleanupOpening to traffic
Chapter 7 – Chip Seals
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TroubleshootingTroubleshooting
2-4.71
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TroubleshootingWhat is wrong here?
StreakingStreaking
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TroubleshootingWhat is wrong here?
Poor Longitudinal JointPoor Longitudinal Joint
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TroubleshootingWhat is wrong here?
BleedingBleeding
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TroubleshootingWhat is wrong here?
Loss of Cover AggregateLoss of Cover Aggregate
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TroubleshootingWhat is wrong here?
Non-uniform Aggregate CoverageNon-uniform Aggregate Coverage
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TroubleshootingPossible Construction Problems
Problem:Aggregate embedment > 80 percent
Potential causes? (Refer to Table 7-7)
Chapter 7 – Chip Seals
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TroubleshootingPossible Construction Problems
Problem:Aggregate embedment < 50 percent
Potential causes? (Refer to Table 7-7)
Chapter 7 – Chip Seals
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TroubleshootingWhat is wrong here?
Loss of aggregate due to inadequate curingLoss of aggregate due to inadequate curing
Chapter 7 – Chip Seals
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TroubleshootingWhat is wrong here?
Single OverlapSingle Overlap
Chapter 7 – Chip Seals
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TroubleshootingWhat happened here?
Chapter 7 – Chip Seals
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Thank You
Questions?
Chapter 7 – Chip Seals