Slurry Seal and Microsurfacing

An Introduction to Slurry An Introduction to Slurry Seal and Microsurfacing Seal and Microsurfacing

SystemsSystems

By: Steve OlsenBy: Steve Olsen

Industry GoalsIndustry Goals

Improve Agency AwarenessImprove Agency AwarenessEducate Decision MakersEducate Decision MakersSet Product ExpectationsSet Product Expectations““Raise the BarRaise the Bar”” of Materials & Guidelinesof Materials & GuidelinesImprove Quality of Finished ProductImprove Quality of Finished Product

Topics we will cover:Topics we will cover:

Slurry Seal & Slurry Seal & Microsurfacing SystemsMicrosurfacing Systems

HistoryHistoryConsiderations for useConsiderations for useAggregateAggregateEmulsionEmulsionMix DesignMix Design

Application & EquipmentApplication & Equipment

Slurry Seal Slurry Seal ––

What is it?What is it?

Developed in the 1930Developed in the 1930’’s in Germanys in GermanyA coating consisting of fine crushed aggregate, A coating consisting of fine crushed aggregate, emulsified asphalt and water was applied to emulsified asphalt and water was applied to roadwaysroadwaysEmulsion serves as a binder to hold the Emulsion serves as a binder to hold the aggregate together and to adhere to the roadwayaggregate together and to adhere to the roadwayAppeared to be an economical way to maintain Appeared to be an economical way to maintain asphalt roadways.asphalt roadways.Not ProprietaryNot Proprietary

Microsurfacing Microsurfacing ––

What is it?What is it?

Slurry Seal was expanded upon in the late 1960Slurry Seal was expanded upon in the late 1960’’s and s and early 1970early 1970’’s in an attempt to use slurry in thicker s in an attempt to use slurry in thicker applications that could be applied in narrow courses in applications that could be applied in narrow courses in wheel ruts to avoid not having to replace expensive wheel ruts to avoid not having to replace expensive traffic delineation on the autobahns.traffic delineation on the autobahns.High quality aggregates and advanced emulsions where High quality aggregates and advanced emulsions where incorporatedincorporatedA stable product when applied in multiA stable product when applied in multi--stone thickness stone thickness resulted.resulted.Not ProprietaryNot Proprietary

Where to use Slurry Seal TreatmentsWhere to use Slurry Seal Treatments

On Newer PavementsOn Newer PavementsBoth low and high volume roadsBoth low and high volume roadsParking AreasParking AreasAirportsAirportsBike PathsBike PathsPavement DelineationPavement DelineationPreventative Maintenance ProgramPreventative Maintenance ProgramWith Chip Seals to make a Cape SealWith Chip Seals to make a Cape Seal

Where to use MicroWhere to use Micro--Surfacing Surfacing TreatmentsTreatments

Surface Treatments For High Volume Collectors And Surface Treatments For High Volume Collectors And Arterials As Well As HighwaysArterials As Well As HighwaysRut Filling ApplicationsRut Filling ApplicationsDouble Applications For Addressing Surface Double Applications For Addressing Surface Irregularities Irregularities Night WorkNight WorkAreas Where Fast Traffic Times Are Of ConcernAreas Where Fast Traffic Times Are Of ConcernConcrete Bridge DecksConcrete Bridge DecksAirportsAirports

What Makes Micro Different than What Makes Micro Different than Slurry?Slurry?

Higher Polymer Content in the EmulsionHigher Polymer Content in the EmulsionHigher Asphalt Residual ContentHigher Asphalt Residual ContentFast Setting ChemicalsFast Setting Chemicals-- Allows Faster BreakAllows Faster BreakHigher Quality Aggregate RequiredHigher Quality Aggregate RequiredSlurry Pavers with the Capability to mix the MicroSlurry Pavers with the Capability to mix the MicroAugured BoxesAugured BoxesHigher Quality Control required with the systemHigher Quality Control required with the systemThis semi liquid surface profiling material that This semi liquid surface profiling material that transitions to a dense cold mix material is able to transitions to a dense cold mix material is able to support traffic as quick as one hour after placementsupport traffic as quick as one hour after placement

When to use Slurry Seal and When to use Slurry Seal and Microsurfacing TreatmentsMicrosurfacing Treatments

ApplicationsApplicationsWhere and When Can We Apply Slurry Seal?Where and When Can We Apply Slurry Seal?

Best Practice = Preventative MaintenanceBest Practice = Preventative MaintenanceBand Aids = Raveled or Distressed AsphaltBand Aids = Raveled or Distressed AsphaltWorst Case Scenario = Buys You TimeWorst Case Scenario = Buys You Time

Estimated Service Life of Slurry Seal Estimated Service Life of Slurry Seal and Microsurfacing Treatmentsand Microsurfacing Treatments

PCI = 80 Good Condition 7PCI = 80 Good Condition 7--10 years10 yearsPCI = 60 Fair Condition 5PCI = 60 Fair Condition 5--7 Years7 YearsPCI = 40 Poor Condition 2PCI = 40 Poor Condition 2--5 Years5 Years

Factors to considerFactors to consider

Existing Pavement ConditionExisting Pavement ConditionSurface Preparation, Weeding, Crack Sealing, Patch Repairs, Surface Preparation, Weeding, Crack Sealing, Patch Repairs, Cleaning and Striping removal.Cleaning and Striping removal.Traffic Levels and Traffic Control RequirementsTraffic Levels and Traffic Control RequirementsClimate and Weather ConditionsClimate and Weather ConditionsDay or Night ApplicationDay or Night ApplicationPower Steering ScuffingPower Steering ScuffingReflective CrackingReflective CrackingRavel or shedding of productRavel or shedding of productUrban vs. Rural SettingsUrban vs. Rural SettingsAvailability of Staging LocationsAvailability of Staging LocationsAvailability of Materials/ContractorsAvailability of Materials/Contractors

BenefitsBenefits

Extends Service Life of Existing PavementsExtends Service Life of Existing PavementsImproved Ride QualityImproved Ride QualityImproved Skid ResistanceImproved Skid ResistanceSeal Pavement / Restore Loss Of Matrix Seal Pavement / Restore Loss Of Matrix Improve AppearanceImprove AppearanceStriping Delineation / ContrastStriping Delineation / Contrast

Factors That May Affect Service LifeFactors That May Affect Service Life

Rock and Emulsion CharacteristicsRock and Emulsion CharacteristicsVolume of TrafficVolume of TrafficStudded Tire WearStudded Tire WearSnow & Ice Removal EffortsSnow & Ice Removal EffortsContractor WorkmanshipContractor Workmanship

Slurry Seal and Microsurfacing Slurry Seal and Microsurfacing SystemsSystems

Aggregate continuedAggregate continued……Application RatesApplication Rates

Expressed as Dry Pounds of Aggregate per Square Expressed as Dry Pounds of Aggregate per Square YardYardTypical Application RatesTypical Application Rates

Type 1Type 1 88--12 #/SY12 #/SYType 2Type 2 99--18 #/SY18 #/SYType 3Type 3 1515--24 #/SY24 #/SYType 3 MicroType 3 Micro 1818--36 #/SY36 #/SY


Aggregate continuedAggregate continued……Aggregate Qualities and Predictors of SuccessAggregate Qualities and Predictors of Success

Sand EquivalencySand EquivalencyFines DurabilityFines DurabilityAbrasion ResistanceAbrasion ResistanceAbsorption RatesAbsorption RatesSpecific GravitySpecific GravitySodium SoundnessSodium Soundness


Aggregate continuedAggregate continued……Potential IssuesPotential Issues

Consistency Consistency Gradations / OversizeGradations / OversizeSE of AggregateSE of AggregateContamination Contamination -- Plant / TruckerPlant / TruckerStockpile ContaminationStockpile Contamination


Aggregate continuedAggregate continued……Application RatesApplication Rates

Factors That Determine Application RatesFactors That Determine Application RatesAggregate GradationAggregate GradationSpecific GravitySpecific GravitySurface TextureSurface Texture

Considerations for Specifying Application Rates (or Considerations for Specifying Application Rates (or Gradation of Aggregate)Gradation of Aggregate)

What type of pavement are we affecting?What type of pavement are we affecting?


Aggregate continuedAggregate continued……Different SizesDifferent Sizes

TT--3 Micro @ 35 # Pounds Dry3 Micro @ 35 # Pounds Dry


EmulsionsEmulsionsWhat is an EmulsionWhat is an Emulsion

Asphalt, Water and an EmulsifierAsphalt, Water and an Emulsifier

TerminologyTerminologyChargeChargeSpeed of SetSpeed of SetModifiersModifiersExamplesExamples

SS, CSS, CMS, CQS, CRSSS, CSS, CMS, CQS, CRSLMLM--CQS or PMCQS or PM--CRSCRS


Emulsions continuedEmulsions continued……How Are They ManufacturedHow Are They Manufactured

Base StocksBase StocksEmulsifiersEmulsifiersModifiersModifiers

PolymersPolymersLatexLatex


Emulsions continuedEmulsions continued……Potential IssuesPotential Issues

ConsistencyConsistencyBase StockBase StockEmulsion TemperaturesEmulsion TemperaturesStabilityStabilityPlant or Trucker Contamination Plant or Trucker Contamination Field ProblemsField Problems


Mix DesignsMix DesignsWhat are they?What are they?

Formulations for a Specific Aggregate and EmulsionFormulations for a Specific Aggregate and EmulsionProvides a Band for: Provides a Band for:

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

Testing Criteria Helps Predicts:Testing Criteria Helps Predicts:Workability Workability Successful Service LifeSuccessful Service Life

EquipmentEquipment

EquipmentEquipment

Equipment Types and Methods Equipment Types and Methods Mobile MixersMobile Mixers

EquipmentEquipment

Equipment Types and Equipment Types and Methods Methods Continuous MixersContinuous MixersCommon With Common With MicroMicroReduces Transverse Reduces Transverse JointsJoints

EquipmentEquipment

Calibrations Calibrations Calibrations Used to Mix Components per the Calibrations Used to Mix Components per the Mix DesignMix DesignTrial Runs to Demonstrate Workability and Trial Runs to Demonstrate Workability and Gate Settings that Yield Oil Contents per the Gate Settings that Yield Oil Contents per the Mix DesignMix DesignWhen Should Calibrations be Performed? When Should Calibrations be Performed?

AnnuallyAnnuallyUsing New AggregateUsing New Aggregate

EquipmentEquipment

Spreader Boxes:Spreader Boxes:ConventionalConventionalAuger BoxAuger Box

Single and DualSingle and Dual

Rut BoxRut BoxDrags such Burlap and Fabric Are Used to Drags such Burlap and Fabric Are Used to Achieve Different Surface TexturesAchieve Different Surface Textures

EquipmentEquipment

Spreader Boxes:Spreader Boxes:

Auger Boxes required for Microsurfacing.

Augers push material to outer edges of the box as well as keep mix from segregating.

Rut Fill BoxRut Fill Box

Wyoming Hwy 80Wyoming Hwy 80

YOSEMITE NATIONAL PARKYOSEMITE NATIONAL PARK

MICROMICRO-- SURFACINGSURFACING

OWNER; FEDERAL HIGHWAY ADIMISTRATIONOWNER; FEDERAL HIGHWAY ADIMISTRATION

SummarySummary

Slurry Seal and Microsurfacing Are Tools For Slurry Seal and Microsurfacing Are Tools For Your Your ““ToolboxToolbox”” For Preventative Maintenance For Preventative Maintenance or Asphalt Repairor Asphalt RepairSystems Can Be Selected To Tackle A Large Systems Can Be Selected To Tackle A Large Array of ConditionsArray of ConditionsSystems Can Be Used In Conjunction With Systems Can Be Used In Conjunction With Other Programs Such As Crack Sealing, Chip Other Programs Such As Crack Sealing, Chip Seals and Scrub SealsSeals and Scrub Seals

SummarySummary

To Receive Further InformationTo Receive Further InformationContact Other Agency Representatives Who Have Contact Other Agency Representatives Who Have Utilized These Systems In Their Preventative Utilized These Systems In Their Preventative Maintenance ProgramsMaintenance ProgramsContact Intermountain Slurry Seal, Inc., and or Contact Intermountain Slurry Seal, Inc., and or Other Contractors and SuppliersOther Contractors and SuppliersVisit the International Slurry Surfacing Association Visit the International Slurry Surfacing Association Website (www.slurry.org)Website (www.slurry.org)

Questions?Questions?

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Slurry Seal and Microsurfacing