overview of crack sealing...
TRANSCRIPT
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OVERVIEW OF CRACK SEALING TECHNOLOGY
Jim ChehovitsCrafco, Inc
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Crack Treatment- Overview
• Cracking in AC Pavements• Pavement Deterioration Due to Cracking• Effects of Crack Sealing on Pavement
Performance• Required Material Properties• Installation Configurations and Proceedures• Crack Sealing Process Design
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Crack Formation
Cracking occurs when the AC mix can no longer flow to accomodate stresses/ strains from traffic loadings and temperature changes.
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Crack Types
•Thermal –Transverse, Longitudinal•Fatigue•Block•Reflective•Construction•Other
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Crack type- thermal
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Crack type- longitudinal
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Crack Movements
Horizontal- Temperature changes, spacing
Vertical- Traffic loadings
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Horizontal Movements
Seasonal Daily
Rate, mm/min 0- 0.004 0- 0.01
Amount, mm 0-25 0-2
Cracks can open as much as 100%+ of original width as the pavement contracts from summer to winter temperature extremes
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Vertical Movements
• Due to traffic loadings• Deflection at the crack under load is many
times greater than before cracking
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Crack Growth
• Cracks widen as they age• Crack face deterioration, ravelling• Mixture shrinkage• Incompressible intrusion• Widening of approx 10% of annual
movement per year
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Incompressible intrusion
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Pavement Deterioration Resulting From Cracking
• Local water intrusion weakens subgrade– 2% w/c increase, 100% strength reduction
• AC mix damage, 50% thickness reduction– Damage approx 1m each side of crack
• Increased deflections from traffic loads– Potholes, depressions, secondary cracking
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Water intrusion
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Pavement Condition Curve
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Pavement Deterioration
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Crack Sealing Function and Effects
• Reduce water penetration into underlying pavement layers, maintain base strength near the crack
• Reduce incompressibles, reduce crack growth
• Seals crack surfaces, reduces ravellingand crack growth
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Crack Sealing Effects on Pavement Condition
• Slows pavement deterioration • Slows roughness increases• Reduces pothole and depression
formation• Slows crack spalling• Extends pavement life, 2-5 years
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Slow Down Pavement Deterioration
Performance Curves: control vs Treated -- Highway 11 (Ontario)
30405060708090
100
1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998
Years of Service
Pave
men
t Con
ditio
n In
dex
Minimal acceptable level
Predicted
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Crack Sealing in Pavement Management
• Typically incorporated in PCI determinations by reducing severity ratings for sealed cracks
• Sealed cracks are rated as low severity, while unsealed may be moderate or high severity
• Slows roughness increases
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Crack Sealing in Preventive Maintenance and Pavement Preservation
• Crack sealing is one of the typical preventive maintenance procedures– Chip seals, Slurry /Micro surfacing– Thin Overlays– Recycling– Crack Sealing
• Crack Sealing is used extensively in conjunction with other preservation processes, usually as a pretreatment
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Crack Sealing Life Expectancy• Up to 10 years at a 75% effectiveness
(FHWA RD-99-147)• With proper timing, materials and
installation methods for the project, crack sealing is a cost effective process
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Crack Sealing Treatments Need to Resist-Temperature extremes-Traffic loadings-Horizontal and Vertical Movements-Aging-Water-Abrasion
WITHOUT
-Debonding, Cracking, or Tracking
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Crack Treatment Basic Elements• Pavement• Crack Seal Material• Installation Geometry
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Asphalt Concrete Pavement
• Varying overall condition• Varying crack types• Varying crack spacings• Varying crack conditions• Varying other distresses• Varying mixture designs• Varying surfacing materials
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Crack Sealing Material Characteristics
-Application Consistency-Adhesion-High Temperature Stiffness-Low Temperature Extensibility-Elasticity-Application Life-Weathering Resistance-Compatibility with Asphalt Concrete-Curing time-Relaxation
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Crack Sealing Material Types
• Asphalt Cements• Asphalt Emulsions, Cold Applied• Asphalt Cutbacks, Cold Applied• Modified Asphalts, Hot Applied
– Fiber, rubber, polymers• Polymeric
– Urethanes, silicone, epoxy
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Hot Applied Modified Asphalts
• ASTM Specs -- D5078, D6690,I-IV• AASHTO Specs—M324, I-IV• Variety of State, local Specs• Manufacturer Specifications
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Installation Configurations
• Overband-- 1/8 in. max thickness by approx 4 in wide
• Reservoir--- ½ to 1 ½ in wide, ½ to 1 in deep
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Crack Seal Treatment Design Process
• Pavement Evaluation• Process Selection• Temperature Ranges• Material Selection• Installation Geometry• Installation
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Pavement Evaluation
• Determine Cracking type and extent• Consider overall pavement condition• Generally applicable at PCI approx 50-80,
but can vary depending on climate, traffic, and other factors
• Pavement condition can be too bad for crack sealing
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Forget it!!
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General Pavement Guidelines
• Intact, defined crack faces• Maximum crack width of 1.5 in. • Not significant base damage
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Process Selection
• Working or Non–Working cracks• Working->1/8 in thermal movement,
typically transverse spaced at over 20 ft.– Use Crack Seal Process
• Non-Working- < 1/8 in thermal movement, Typically longitudinal, transverse or other types spaced at less than 20 ft.– Use Crack Fill Process
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Crack Seal Process
• Flexible, extensible materials that can accommodate the expected annual temperature changes and movements
• Installed in widened reservoirs, designed to take the expected movement– Widened reservoirs reduce sealant extension
percentages as the pavement contracts from summer to winter
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Crack Fill Process
• Stiffer, yet flexible, more traffic resistant materials
• Installed in cleaned existing cracks, or in routed reservoirs for improved life
• Typically installed in a fill and overbandconfiguration
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Temperature Ranges
• Determine temperature extremes• LTPPBIND, at surface level• Ranges from 76-10 to 64-40• FHWA Application Note- RD-03-080
Using LTPPBIND V2.1 to Improve Crack Sealing in Asphalt Concrete Pavements
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LTPPBIND
Available from FHWA
•On the Web
•On CD
•By Mail
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LTPPBIND
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Materials Selection--Low Temperature Property Evaluation
• Bond Test -18C, -29C, 50-200% extension
• Mandrel Bend/ Flexibility- 0C to -40C• Penetration at -18C• Stiffness at low temperatures• Relaxation at Low temperatures• Experience
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BBR Stiffness Measurements
• For good performing material in MN in transverse cracks, when PAV aged, and tested at -34C,– S = 11.0 mpa– M value = 0.463
• Approximately 1/50 the stiffness of -34 grade asphalt cement
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High Temperature Property Evaluation
• Softening Point• Flow at 60 or 70C• Penetration at 25, 58, 64, 70, 76, 82C• DSR• Experience
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General Specification Applicability
• -34,-40 areas D6690 Type IV• -22,-28 areas D6690 Type II,III• -16 areas D6690 Type I• -10 areas State, local specs
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Sealant Properties/Performance
• Sealant material performance is controlled by the relationships and interactions of low temperature, high temperature, adhesive and elastic properties over the entire range of temperatures and strains experienced.
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Installation Configurations-Working Cracks
• Reservoir width based on temperature range and crack spacing.
• Temp Range Min Width Depth<80C ½ in ¾ in86C ¾ in ¾ in92C 1 1/8 in ½ in96C+ 1 ½ in ½ in
If crack spacing is over 50 -60 ft, consider next wider size
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Reservoir Types/Sizes
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Installation Configuration- Non Working Cracks
• Fill existing cleaned crack, or• Use overband, 1/8 in max by 4 in wide, or• Can also use reservoir for longer life,
typically 1/2 in by ¾ in.
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Recommend Overband Appearance
(Non-Rout/Clean & Fill)
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Not recommended
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Reservoir Cutting
• Cut with router or crack saw• Remove at least 1/8 in of mix from each
side of crack• Center reservoir over the crack• The cut faces should be intact without
spalling from the cutting operation
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Routing•Rout at least 1/8”from each crack face
•Keep centered over crack
•Reduce spalling by using as many cutters as possible
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Sealant Installation--Cleaning and Drying
• Dry Compressed Air, 100 psi min• Vacuum system, for reduce dust• Heat Lance
• Objective– clean, dry, intact crack face surfaces
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Clean cracks:
Not CleanClean
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Vacuum •Reduces dust
•No post job clean up
•Healthier work environment
•Safer work environment
•PM 10 air regulation compliant
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Sealant Heating
• Appropriate Melters- Heat to specified required temperatures– Indirectly heated– Thermostatic Heating controls– Effective, continuous agitation– Over heating prevention– Correct size for production rate desired– Several versions and sizes available
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Sealant Heating
• Sealant must be heated to and installed within specified temperature ranges
• Overheating can degrade material--polymer breakdown, crosslinking, reduce application life
• Underheating can result in not achieving material properties and adhesion
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Weather Conditions
• Minimum 40 F pavement temperature• Dry pavement and cracks• Rain not imminent
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Finishing
• Recessed Fill- leave approx ¼ inch low in the crack
• Flush Fill– fill to flush with the pavement surface
• Slight overlap- slight overfill with approx ¼-1/2 inch overlap on each side of crack
• Overband- 1/8 in by approx 4 in wide band centered over top of crack
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Failure Modes
• Adhesion loss- cleaning, moisture, install temperatures, weak mix, wrong sealant
• Cohesive Fracture-wrong sealant or geometry
• Pullouts-wrong sealant, cleaning, moisture, excess application
• Tracking-wrong sealant,excess application• Installation Errors
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Missed Crack During Installation
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Process Comparison to Hot Mix AC
Hot Mix Crack SealPavement Design Evaluation, Seal, FillAc/Agg Specs Sealant Type/Prop.Mix Design Install GeometryConstruction Installation
Temps, compaction Temps, cleaningQuality Control Quality Control
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Elements of Successful Crack Sealing
• Right Pavement• Right Time• Right Sealant• Right Geometry• Right Installation• Right Temperatures
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Potential Research Topics
• Crack Movement Determination Procedure– Determine movements to better select the treatment
process and reservoir size• Crack Treatment Design Process
– Guide to select pavements, process type, sealant type, installation geometry
• Sealant Materials Properties– Properties determined/ measured considering
standard temperature ranges, installation geometries, and expected movements
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Summary
• Asphalt pavements crack• Sealing cracks extends pavement life• Crack seal process must be designed for
the pavement conditions• Sealant performance is the result of the
balance of properties over the entire temperature range experienced
• Correct installation geometry is required for appropriate performance