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An Introduction to SlurryAn Introduction to Slurry

Seal and MicrosurfacingSeal and Microsurfacing

SystemsSystems

By: Steve OlsenBy: Steve Olsen

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Industry GoalsIndustry Goals

Improve Agency AwarenessImprove Agency Awareness

Educate Decision MakersEducate Decision Makers

Set Product ExpectationsSet Product Expectations

Raise the BarRaise the Bar of Materials & Guidelinesof Materials & Guidelines

Improve Quality of Finished ProductImprove Quality of Finished Product

Increase product awareness along with expandedIncrease product awareness along with expandedproper use of slurry seal and micro sealsproper use of slurry seal and micro seals

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Topics we will cover:Topics we will cover:

Slurry Seal & Micro SystemsSlurry Seal & Micro Systems

HistoryHistory

EquipmentEquipment

Considerations for useConsiderations for use ApplicationApplication

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Slurry SealSlurry Seal What is it?What is it?

Developed in the 1930Developed in the 1930s in Germanys in Germany

A coating consisting of fine crushed aggregate,A coating consisting of fine crushed aggregate,emulsified asphalt and water was applied toemulsified asphalt and water was applied toroadwaysroadways

Emulsion serves as a binder to hold theEmulsion serves as a binder to hold theaggregate together and to adhere to the roadwayaggregate together and to adhere to the roadway

Appeared to be an economical way to maintainAppeared to be an economical way to maintainasphalt roadways.asphalt roadways.

Not ProprietaryNot Proprietary

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Early 20Early 20thth Century Seal CoatCentury Seal Coat

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An Innovation: 1930An Innovation: 1930-- 19501950ss

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19601960s Slurry Seals Slurry Seal

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2121stst Century truck mounted machinesCentury truck mounted machines

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2121stst Century SelfCentury Self-- LoadingLoading

Continuous Micro PaverContinuous Micro Paver

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Slurry surfacingSlurry surfacing purposepurpose

Thin surface application for maintenance ofThin surface application for maintenance of

existing road surfacesexisting road surfaces Fills and seals small surface cracksFills and seals small surface cracks

Provides new wearing surfaceProvides new wearing surface Slows or reverses age hardening in the originalSlows or reverses age hardening in the original

road surfaceroad surface

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Where to use Slurry Seal TreatmentsWhere to use Slurry Seal Treatments

On Newer PavementsOn Newer Pavements

Both low and high volume roadsBoth low and high volume roads Parking AreasParking Areas

AirportsAirports Bike PathsBike Paths

Pavement DelineationPavement Delineation

Preventative Maintenance ProgramPreventative Maintenance Program

Chip SealsChip Seals-- Cape SealCape Seal

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MicroMicro--surfacingsurfacing --purposepurpose

An Alternative to thin hotAn Alternative to thin hot-- mix overlays for rutmix overlays for rut

filling( high traffic loads)filling( high traffic loads) Mat has structural strength properties similar toMat has structural strength properties similar to

hot mixhot mix Good longGood long--term wear properties and macroterm wear properties and macro--

texture for skid resistancetexture for skid resistance

Fast return of TrafficFast return of Traffic

Night time applicationsNight time applications

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What Makes Micro Different thanWhat Makes Micro Different than

Slurry?Slurry? Higher polymer content in the emulsionHigher polymer content in the emulsion

Higher asphalt residual contentHigher asphalt residual content

Fast setting chemicalsFast setting chemicals-- allows faster breakallows faster break

Higher quality aggregate requiredHigher quality aggregate required

Micro requires more powerful equipment to mix theMicro requires more powerful equipment to mix theMicroMicro

Augured boxesAugured boxes

Higher quality control required with the systemHigher quality control required with the system This semi liquid surface profiling material thatThis semi liquid surface profiling material that

transitions to a dense cold mix material is able totransitions to a dense cold mix material is able tosupport traffic as quick as one hour after placementsupport traffic as quick as one hour after placement

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Where to use MicroWhere to use Micro--SurfacingSurfacing

TreatmentsTreatments Surface Treatments For High Volume Collectors AndSurface Treatments For High Volume Collectors And

Arterials As Well As HighwaysArterials As Well As Highways Rut Filling ApplicationsRut Filling Applications

Double Applications For Addressing SurfaceDouble Applications For Addressing Surface

IrregularitiesIrregularities

Night WorkNight Work

Areas Where Fast Traffic Times Are Of ConcernAreas Where Fast Traffic Times Are Of Concern Concrete Bridge DecksConcrete Bridge Decks

AirportsAirports

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Performance properties of Slurry SealPerformance properties of Slurry Seal

and Microsurfacing Treatmentsand Microsurfacing Treatments

Slurry and Micro Will Correct:Slurry and Micro Will Correct: Surface binder aging effectsSurface binder aging effects

Surface crackingSurface cracking RavelingRaveling

Polished surfacesPolished surfaces

Poor asphalt patches resurfacingPoor asphalt patches resurfacing

Aesthetic propertiesAesthetic properties

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Additionally MicrosurfacingAdditionally Microsurfacing

Treatments can correct:Treatments can correct: Surface profileSurface profile

Some binder or load design deficienciesSome binder or load design deficiencies

RuttingRutting

Bleeding or flushed pavementsBleeding or flushed pavements

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Factors to consider :Factors to consider :

Pavement DistressPavement Distress SlurrySlurry MicroMicro

Surfacing CrackingSurfacing Cracking YesYes YesYes

Hairline CrackingHairline Cracking YesYes YesYes Thermal or TransverseThermal or Transverse -- --

Fatigue or AlligatorFatigue or Alligator -- --

Block CrackingBlock Cracking -- --

Corrugation or ShovingCorrugation or Shoving -- YesYes RuttingRutting -- YesYes

RavelingRaveling YesYes YesYes

BleedingBleeding -- YesYes

PolishingPolishing YesYes YesYes Base Repair Asphalt PatchesBase Repair Asphalt Patches YesYes YesYes

Loss of ProfileLoss of Profile -- YesYes

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BenefitsBenefits

Extends Service Life of Existing PavementsExtends Service Life of Existing Pavements

Improved Ride QualityImproved Ride Quality

Improved Skid ResistanceImproved Skid Resistance

Seal Pavement / Restore loss of matrixSeal Pavement / Restore loss of matrix Improve AppearanceImprove Appearance

Striping Delineation / ContrastStriping Delineation / Contrast

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What are Mix Designs ?What are Mix Designs ?

Formulations for a Specific Aggregate and EmulsionFormulations for a Specific Aggregate and Emulsion

Grading Band of AggregateGrading Band of Aggregate

Optimal Asphalt Content (Residual Asphalt)Optimal Asphalt Content (Residual Asphalt)

Wet CohesionWet Cohesion Set TimesSet Times

Wet Track Abrasion testing (1hr) & (6day) PredictsWet Track Abrasion testing (1hr) & (6day) PredictsLossLoss

Excess AsphaltExcess Asphalt --Loaded Wheel testLoaded Wheel test Helps setHelps set

Maximum asphalt contentMaximum asphalt content

Successful Service LifeSuccessful Service Life

Equipment calibrationsEquipment calibrations

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EquipmentEquipment

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Mixing SequenceMixing Sequence

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Slurry Seal and MicrosurfacingSlurry Seal and Microsurfacing

SystemsSystemsGradation SizesGradation Sizes

TypeType -- 11

TypeType -- 22TypeType -- 33

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Slurry and micro applicationSlurry and micro application

Ex is t i ng road sur face

Slurry surfacing

- Laid at one-stone thickness- Largest stone bears traffic load- Not designed for multiple layering

1 / 4 - 3 / 8

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Slurry and micro applicationSlurry and micro application

Ex is t i ng road sur face

Micro-surfacing

- Applied in multi-stone thickness- Stone interlock and modified binder bears traffic load- May be applied in multiple layers

3 / 8 +

3 / 8 +

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CleaningCleaning

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II--80, MP 128.7 to 137.080, MP 128.7 to 137.051,025 AADT51,025 AADT

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BEFORE

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AFTER

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Wyoming Hwy 80Wyoming Hwy 80

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FEDERAL HIGHWAY ADIMISTRATIONFEDERAL HIGHWAY ADIMISTRATION

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Summary & ConsiderationsSummary & Considerations

Slurry Seal and Microsurfacing Are Tools For YourSlurry Seal and Microsurfacing Are Tools For YourToolboxToolbox For Preventative Maintenance or AsphaltFor Preventative Maintenance or AsphaltRepairRepair

Systems Can Be Selected To Tackle A Large Array ofSystems Can Be Selected To Tackle A Large Array ofConditionsConditions

EcoEco-- FriendlyFriendly

Increase Warranty periodIncrease Warranty period

Systems Can Be Used In Conjunction With OtherSystems Can Be Used In Conjunction With OtherPrograms Such As Crack Sealing, Chip Seals and ScrubPrograms Such As Crack Sealing, Chip Seals and ScrubSealsSeals

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Questions?Questions?