Micro-Surfacing used in Micro-Surfacing used in “Pavement Preservation “Pavement Preservation
Practices”Practices”
The problemThe problem Too many roads, not enough fundsToo many roads, not enough funds
The opportunityThe opportunity A sound pavement preservation A sound pavement preservation program to optimize paving fundsprogram to optimize paving funds
Pavement PreservationPavement Preservation““Strategy including all activities to Strategy including all activities to provide & maintain serviceable roadways”provide & maintain serviceable roadways”
The right treatment,The right treatment,on the right pavement,on the right pavement,at the right timeat the right time
Lower life cycle costs, higher quality Lower life cycle costs, higher quality pavementspavements
Keeping good pavements goodKeeping good pavements good In essence, buying timeIn essence, buying time
What is Pavement What is Pavement Preservation?Preservation?
Asset managementAsset management Protect investment Protect investment Enhance cost-effectiveness of treatmentsEnhance cost-effectiveness of treatments Lower life cycle costsLower life cycle costs
Preventive maintenance (PM) seals & Preventive maintenance (PM) seals & protectsprotects Extend pavement lifeExtend pavement life Delay future deteriorationDelay future deterioration
Enhance pavement performanceEnhance pavement performance Improve functional conditionImprove functional condition
e.g. skid resistancee.g. skid resistance Reduce user delaysReduce user delays
Get in, get out, stay outGet in, get out, stay out
Pavement
condition
Time or traffic
Conventional overlay
Preventive maintenance treatments
The Right TimeThe Right TimeStrategy to Minimize CostsStrategy to Minimize Costs
Conditio
n
Time
$1 for preventive maintenance here
Is 3 to 10 times more cost
effective than here
Effective PreventiveEffective PreventiveMaintenanceMaintenance
Micro-SurfacingMicro-SurfacingThe Right Treatment For:The Right Treatment For:
Restoring surface quality & skid Restoring surface quality & skid resistanceresistance
Rut fillingRut filling Quick construction, quick traffic returnQuick construction, quick traffic return WeatherproofingWeatherproofing
Sealing Sealing Reducing oxidationReducing oxidation
Extending the life of HMA and chip-seal Extending the life of HMA and chip-seal pavements. Including those HMA pavements pavements. Including those HMA pavements where edge-grinding practices have been where edge-grinding practices have been used and the curb has been compromised used and the curb has been compromised with many HMA overlays.with many HMA overlays.
What is Micro-Surfacing?What is Micro-Surfacing?HistoryHistory
Developed in Europe in 1970’s withDeveloped in Europe in 1970’s with the proprietary name of “RALUMAC.”the proprietary name of “RALUMAC.” Introduced in U.S. in 1980’s and Introduced in U.S. in 1980’s and genericallygenerically
named: “Micro-Surfacing”.named: “Micro-Surfacing”. Now routinely used in more than 40 statesNow routinely used in more than 40 states
Used for rut filling & texturing.Used for rut filling & texturing. Strictly a topical treatment. Will not Strictly a topical treatment. Will not correctcorrect
any structural or base problems. any structural or base problems.
Micro-SurfacingMicro-Surfacing A designed mixture of:A designed mixture of:
polymer modifiedpolymer modified emulsified asphalt emulsified asphalt
100% crushed aggregate:100% crushed aggregate: limestone, slag, trap-rocklimestone, slag, trap-rock mineral fillermineral filler waterwater other additivesother additives
Proportioned, mixed & uniformly spread Proportioned, mixed & uniformly spread over a properly prepared surface over a properly prepared surface
ISSA A-143ISSA A-143 State DOT specificationsState DOT specifications ASTM D-6372ASTM D-6372
Micro-Surfacing Micro-Surfacing ComponentsComponents
Water
Mineral Filler
Aggregate
Additive
Micro-Surfacing Emulsion
Micro-Surfacing Micro-Surfacing EmulsionEmulsion
em ulsifier w ater acid polym er asphalt
M ILL
Polym erM odifiedEm ulsion
em ulsifier w ater acid polym er asphalt
M ILL
Polym erM odifiedEm ulsion
Micro-SurfacingMicro-SurfacingMachine SchematicMachine Schematic
Spreaderbox
Crushedaggregat
e
Cementadditiv
ewater
PolymerModifie
dEmulsio
n
Direction
Mixing time15 to 45 seconds
Mixture Brown &Homogeneous
Breaking Time60 to 120 seconds
Traffic in Approximately One Hour
Mixture Black
Water Flows
Micro-Surfacing Machine Micro-Surfacing Machine
9
1
11
67
45
8
3
10
(1) Aggregate bin(2) Mineral filler bin(3) Additive storage(4) Metered aggregate(5) Metered micro-
surfacing emulsion(6) Metered water &
additive(7) Pugmill(8) Micro-surfacing(9) Surfacing spreader
box(10) Brown to black color(11) Road water spray bar
2
Polymer Modified Polymer Modified Residual AsphaltResidual Asphalt
Reduces temperature susceptibilityReduces temperature susceptibility Polymer either mixed into the AC base, Polymer either mixed into the AC base, or or co-milled with the AC in making the co-milled with the AC in making the emulsionemulsion
Minimum of 3% polymer solids based on Minimum of 3% polymer solids based on AC content of emulsionAC content of emulsion
IL-DOT uses an elastic recovery test IL-DOT uses an elastic recovery test toto
determine % of polymer in AC basedetermine % of polymer in AC base
Micro-SurfacingMicro-Surfacing Mix can be placed in Mix can be placed in thicker lifts and still thicker lifts and still remain stable remain stable
Mix retains macro-textureMix retains macro-texture Mix can be “feathered” nextMix can be “feathered” next to the curb/flagto the curb/flag Quick setting for quick Quick setting for quick traffic return. Usually 15 traffic return. Usually 15 minutes to 1 hourminutes to 1 hour
Enhanced durabilityEnhanced durability No dust, no loose stones,No dust, no loose stones, no trackingno tracking Aggregate is encapsulated Aggregate is encapsulated inin
the asphaltthe asphalt
Micro-SurfacingMicro-SurfacingMachine Machine
Continuous Self-Propelled Continuous Self-Propelled Paver Paver
with Support Unitswith Support Units
Loading Area. Aggregate Loading Area. Aggregate stock-pile, emulsion, stock-pile, emulsion,
water tanks.water tanks.
Support unit: water tank, Support unit: water tank, flow-boy feed hydraulic drive, flow-boy feed hydraulic drive,
emulsion tankemulsion tank..
Support unit coupled to Support unit coupled to paver. Notice dark steel-slag paver. Notice dark steel-slag
aggregate.aggregate.
Adding Portland cement. Paver Adding Portland cement. Paver meters 1 to 2% depending on meters 1 to 2% depending on
Micro mix-design.Micro mix-design.
The Micro-Surfacing The Micro-Surfacing ProcessProcess
Click to run movie clip
Appropriate Appropriate SpecificationsSpecifications
Specifications should Specifications should describe & match the describe & match the jobjob
Specifications should Specifications should describe & meet your describe & meet your expectationsexpectations
Surface PreparationSurface Preparation Crack sealingCrack sealing Asphalt patchingAsphalt patching Clean the surfaceClean the surface
Sweep - washSweep - wash Pavement marking removalPavement marking removal
Tape – paintTape – paint Cover the utilities Cover the utilities Remove reflective pavement markersRemove reflective pavement markers
Crack-filled, polished, Crack-filled, polished, somesome
oxidation. Good candidate.oxidation. Good candidate.
Excellent pavement Excellent pavement integrity.integrity.
Cracked filled, great Cracked filled, great candidate.candidate.
Pavement has excellent integrity. Pavement has excellent integrity. If construction seam is not If construction seam is not
filled, it will eventually fail. filled, it will eventually fail. Excellent candidate.Excellent candidate.
Polished, oxidized Polished, oxidized pavement.pavement.
Some patches. Good Some patches. Good candidate.candidate.
Asphalt patch. Oxidized. Asphalt patch. Oxidized. Well maintained pavement.Well maintained pavement.
Road contaminants: dirt, mud, Road contaminants: dirt, mud, sand, vegetation. Pavement sand, vegetation. Pavement
must be cleaned before must be cleaned before application.application.
Ruts < ½” May Be Filled Ruts < ½” May Be Filled With Scratch CourseWith Scratch Course
Full Width Lane
Pavement
o o o o o o o o o o
Steel Strike Off Scratches Surface
The scratch coat is generally 6” less than the width of the lane.
Reprofiling Rutted Reprofiling Rutted WheelpathsWheelpaths
Original Pavement Cross Section Crown
Ruts in Wheelpath
For each inch of applied Micro-Surfacing mix,
add 1/8” to 1/4” crown to each rutfillto compensate for return traffic
compaction
Ruts 1/2” & over must use the rut box
Micro-Surfacing MixMicro-Surfacing Mix
Rut Filling Lay Down Box.Rut Filling Lay Down Box.Generally a Type III Generally a Type III
gradation is used for rut-gradation is used for rut-fillingfilling..
Why do Surface Why do Surface Treatments Fail?Treatments Fail?
Improper road selectionImproper road selection Improper pavement Improper pavement preparationpreparation
Lack of control of Lack of control of materials during materials during applicationapplication
Traffic control Traffic control ----------------------
Working too late in the Working too late in the seasonseason
Material incompatibility Material incompatibility
Micro-Surfacing Can’t Micro-Surfacing Can’t Work Miracles…Bad, Bad, Work Miracles…Bad, Bad,
Bad!Bad!
Instances where pavements have Instances where pavements have reached their “critical mass”. reached their “critical mass”. Beyond preservation or any Beyond preservation or any
topical treatments.topical treatments.
2009 Micro-Surfacing in 2009 Micro-Surfacing in Galesburg, IL with steel Galesburg, IL with steel
slag. 1 of 5slag. 1 of 5
2009 Micro-Surfacing in 2009 Micro-Surfacing in Galesburg, IL with steel Galesburg, IL with steel
slag. 2 of 5slag. 2 of 5
2009 Micro-Surfacing in 2009 Micro-Surfacing in Galesburg, IL with steel Galesburg, IL with steel
slag. Very little curb left slag. Very little curb left to HMA lifts over flag. 3 of to HMA lifts over flag. 3 of
55
2009 Micro-Surfacing in 2009 Micro-Surfacing in Galesburg, IL with steel Galesburg, IL with steel slag. Notice quality of slag. Notice quality of existing pavement. 4 of 5existing pavement. 4 of 5
2009 Micro-Surfacing in Galesburg, IL 2009 Micro-Surfacing in Galesburg, IL with steel slag. Check texture. 60K with steel slag. Check texture. 60K yd2 in 2008, 105K yd2 in 2009. 5 of yd2 in 2008, 105K yd2 in 2009. 5 of
5.5.
Knox County CH 8. 13 Mile Cape-Seal Knox County CH 8. 13 Mile Cape-Seal 2007/2008. Stage construction. Micro 2007/2008. Stage construction. Micro with steel-slag on top of the new with steel-slag on top of the new
polymer chip-seal. 1 of 5polymer chip-seal. 1 of 5
Knox County CH 8. 13 Mile Cape-Seal Knox County CH 8. 13 Mile Cape-Seal 2007/2008. Stage construction. Micro 2007/2008. Stage construction. Micro with steel-slag on top of the new with steel-slag on top of the new
polymer chip-seal. 2 of 5polymer chip-seal. 2 of 5
Knox County CH 8. 13 Mile Cape-Seal Knox County CH 8. 13 Mile Cape-Seal 2007/2008. Stage construction. Micro 2007/2008. Stage construction. Micro with steel-slag on top of the new with steel-slag on top of the new
polymer chip-seal. 3 of 5polymer chip-seal. 3 of 5
Knox County CH 8. 13 Mile Cape-Seal Knox County CH 8. 13 Mile Cape-Seal 2007/2008. Stage construction. Micro 2007/2008. Stage construction. Micro with steel-slag on top of the new with steel-slag on top of the new
polymer chip-seal. 4 of 5polymer chip-seal. 4 of 5
Knox County CH 8. 13 Mile Cape-Seal Knox County CH 8. 13 Mile Cape-Seal 2007/2008. Stage construction. Micro 2007/2008. Stage construction. Micro with steel-slag on top of the new with steel-slag on top of the new
polymer chip-seal. 5 of 5polymer chip-seal. 5 of 5
2009 Mason County Cape-Seal. 2009 Mason County Cape-Seal. Manito Rd. 2 Sections totaling Manito Rd. 2 Sections totaling
8.8 miles. Crack-sealing+polymer 8.8 miles. Crack-sealing+polymer chip-seal+Micro. 1 of 10chip-seal+Micro. 1 of 10
2009 Mason County Cape-Seal. 2009 Mason County Cape-Seal. Manito Rd. 2 Sections totaling Manito Rd. 2 Sections totaling
8.8 miles. Crack-sealing+polymer 8.8 miles. Crack-sealing+polymer chip-seal+Micro. 2 of 10chip-seal+Micro. 2 of 10
2009 Mason County Cape-Seal. 2009 Mason County Cape-Seal. Manito Rd. 2 Sections totaling Manito Rd. 2 Sections totaling
8.8 miles. Crack-sealing+polymer 8.8 miles. Crack-sealing+polymer chip-seal+Micro. 3 of 10chip-seal+Micro. 3 of 10
2009 Mason County Cape-Seal. 2009 Mason County Cape-Seal. Manito Rd. 2 Sections totaling Manito Rd. 2 Sections totaling
8.8 miles. Crack-sealing+polymer 8.8 miles. Crack-sealing+polymer chip-seal+Micro. 4 of 10chip-seal+Micro. 4 of 10
2009 Mason County Cape-Seal. 2009 Mason County Cape-Seal. Manito Rd. 2 Sections totaling Manito Rd. 2 Sections totaling
8.8 miles. Crack-sealing+polymer 8.8 miles. Crack-sealing+polymer chip-seal+Micro. 5 of 10chip-seal+Micro. 5 of 10
2009 Mason County Cape-Seal. 2009 Mason County Cape-Seal. Manito Rd. 2 Sections totaling Manito Rd. 2 Sections totaling
8.8 miles. Crack-sealing+polymer 8.8 miles. Crack-sealing+polymer chip-seal+Micro. 6 of 10chip-seal+Micro. 6 of 10
2009 Mason County Cape-Seal. 2009 Mason County Cape-Seal. Manito Rd. 2 Sections totaling Manito Rd. 2 Sections totaling
8.8 miles. Crack-sealing+polymer 8.8 miles. Crack-sealing+polymer chip-seal+Micro. 7 of 10chip-seal+Micro. 7 of 10
2009 Mason County Cape-Seal. 2009 Mason County Cape-Seal. Manito Rd. 2 Sections totaling Manito Rd. 2 Sections totaling
8.8 miles. Crack-sealing+polymer 8.8 miles. Crack-sealing+polymer chip-seal+Micro. 8 of 10chip-seal+Micro. 8 of 10
2009 Mason County Cape-Seal. 2009 Mason County Cape-Seal. Manito Rd. 2 Sections totaling Manito Rd. 2 Sections totaling
8.8 miles. Crack-sealing+polymer 8.8 miles. Crack-sealing+polymer chip-seal+Micro. 9 of 10chip-seal+Micro. 9 of 10
2009 Mason County Cape-Seal. 2009 Mason County Cape-Seal. Manito Rd. 2 Sections totaling Manito Rd. 2 Sections totaling
8.8 miles. Crack-sealing+polymer 8.8 miles. Crack-sealing+polymer chip-seal+Micro.10 of 10chip-seal+Micro.10 of 10
Benefits of Benefits of Micro-SurfacingMicro-Surfacing
Restoration of surface propertiesRestoration of surface properties & skid numbers& skid numbers Rut-fillingRut-filling Sealing & waterproofingSealing & waterproofing Delineates pavement markings Delineates pavement markings & shoulders& shoulders
Usually no additional shoulder Usually no additional shoulder aggregate is required, resulting in aggregate is required, resulting in additional savingsadditional savings
versus other methodsversus other methods High performance wearing courseHigh performance wearing course Improve pavement aesthetics Improve pavement aesthetics
Benefits of Benefits of Micro-SurfacingMicro-Surfacing
Preserves investmentPreserves investment Quick traffic, Quick traffic, 1 hour or less1 hour or less
Minimizes traffic Minimizes traffic disruptionsdisruptions
Cost effectiveCost effective No appurtenance No appurtenance adjustmentsadjustments
Night time placement Night time placement
Typical Typical Micro-Surfacing CostsMicro-Surfacing Costs
Price varies depending upon Price varies depending upon treatmenttreatment Surface courseSurface course Leveling & surfaceLeveling & surface Rut-fill & surfaceRut-fill & surface Cape-Seal: additional chip-seal costCape-Seal: additional chip-seal cost
Typical life - 5 to 12 yearsTypical life - 5 to 12 years Depends upon condition of pre-existing Depends upon condition of pre-existing pavement, construction quality, pavement, construction quality, climate, traffic and other factors climate, traffic and other factors
The Right TreatmentsThe Right TreatmentsEstimated Life ExtensionEstimated Life Extension
(years)(years)
2 -45 -710 -12Thin HMA2 -45 -78 -12Micro-surfacing1 -33 -57 -10Slurry Seal1 -33 -57 -10Chip Seal1 -21 -33 -5Fog Seal
Poor Condition (PCI=40)
Fair Condition (PCI=60)
Good Condition (PCI=80)Treatment
2 -45 -710 -12Thin HMA2 -45 -78 -12Micro-surfacing1 -33 -57 -10Slurry Seal1 -33 -57 -10Chip Seal1 -21 -33 -5Fog Seal
Poor Condition (PCI=40)
Fair Condition (PCI=60)
Good Condition (PCI=80)Treatment
IL Counties who have used IL Counties who have used Micro, or will be using it Micro, or will be using it
this year.this year.Carroll Kane Mason Carroll Kane Mason Sangamon Sangamon
Champaign Kendall McHenry ShelbyChampaign Kendall McHenry ShelbyColes Knox McLean Coles Knox McLean Whiteside Whiteside
DeWitt LaSalle MonroeDeWitt LaSalle MonroeIroquois Lee OgleIroquois Lee OgleJackson Macon PeoriaJackson Macon Peoria
IL Municipalities who have IL Municipalities who have used Micro, or will be using used Micro, or will be using
it this year.it this year.Erie Sterling Aledo Erie Sterling Aledo StreatorStreator
Fulton Dixon Galesburg Fulton Dixon Galesburg AshlandAshland
Savanna Lanark Geneseo DecaturSavanna Lanark Geneseo DecaturPort Byron Rapids City Belvidere NeogaPort Byron Rapids City Belvidere NeogaHampton Milan Naperville CarbondaleHampton Milan Naperville CarbondaleDurand Moline N. Aurora Durand Moline N. Aurora DanvilleDanville
Rockford E. Moline Ottawa SycamoreRockford E. Moline Ottawa Sycamore
SummarySummary Micro-surfacing, theMicro-surfacing, theright treatment forright treatment for RutfillingRutfilling TexturizingTexturizing Improving skid resistanceImproving skid resistance Sealing out moistureSealing out moisture Ultrathin surfacingUltrathin surfacing Quick construction & traffic returnQuick construction & traffic return Cost-effective pavement preservationCost-effective pavement preservation
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