Microsurfacing Definition Microsurfacing & Chip Seal

1 Pavement PreservationPavement PreservationwithwithMicrosurfacing & chip SealMicrosurfacing & chip SealSEAUPGH ilton Head Island, SC 11-12-2009 Tim HarrawoodVance Brothers, Southern Contracting DivisionMicrosurfacing DefinitionMicrosurfacing DefinitionLaboratory designed mixture of polymer modified asphalt emulsion, aggregate, mineral filler, water and other additives accurately proportioned, mixed and uniformly spread over a properly prepared SpecificationsGoverning SpecificationsMicrosurfacingISSA A 143 ASTM D 3910 FAAP-635 State DOT s and Local SpecificationsTwo Primary UsesTwo Primary UseszPreventive Maintenance To prevent surface distresses in good pavementszCorrective Maintenance To correct surface distresses in older pavementsMicrosurfacingMicrosurfacingzSe als the surface (prevents further weathering of the underlying pavement)zRestores surface texturezProvides new wearing surfacezFills cracks and voidszCorrects other distresses- Leveling Course- Rut FillingCapabilitiesMicrosurfacing AggregatezThe aggregate shall be a manufactured crushed stone such as granite, slag, limestone, chat or other high-quality aggregate or combination project specificationszConsistent within specificationzPolymer Modified Emulsified asphalt (CSS-1HP)- Modified with Natural Latex or Synthetic polymerszPortland Cement, Hydrated Lime or Aluminum SulfatezWaterzAdditives (for break control)

2 Microsurfacing EmulsionMineral FillerComponent MaterialsSEAUPG 2009 CONFERENCE-HILTON HEAD ISLAND, SOUTH CAROLINAMix Design ProcedureMix Design ProcedurezMix Design RequestzIndividual Component AnalysiszInitial Mix TrialszProportion OptimizationzPerformance TestingzFinal Formulation AdjustmentsSurface PreparationSurface PreparationCrack SealingPatchingSweepingBlowingProtection of UtilitiesHow is it appliedHow is it applied??Application EquipmentApplication EquipmentTruck Mounted UnitContinuous Run MachineTruck Mounted UnitTruck Mounted UnitContinuous MachineContinuous MachineSEAUPG 2009 CONFERENCE-HILTON HEAD ISLAND, SOUTH CAROLINAW here Where Can Microsurfacing Can Microsurfacing Be Used?Be Used?Variations:Type IType IIType IIIType IType IResidential StreetsParking LotsAirportsParking LotsType IIType IIResidential StreetsCounty RoadsAirportsType IIIType IIISEAUPG 2009 CONFERENCE-HILTON HEAD ISLAND, SOUTH CAROLINA4 Lane HighwaysInterstates2 Lane HighwaysArterialsResidentialDivided HighwaysOther IdealOther IdealApplicationsApplicationsfor Microsurfacingfor MicrosurfacingCollector RoadsShouldersMilled SurfacesCape SealChip seal followedby MicrosurfacingConsolidation RutsFilling ruts with Microsurfacing Methods.

3 -Leveling/Scratch Course-Rut Filling CourseTypically followed by a surface courseSEAUPG 2009 CONFERENCE-HILTON HEAD ISLAND, SOUTH CAROLINAL eveling(scratch) CourseRuts or lessRut BoxRut Box with MicrosurfacingRut Filling with MicrosurfacingRuts greater than BeforeAfterRut Filling with MicrosurfacingDuringMicrosurfacing Microsurfacing BenefitsBenefitsz1/4 to1/3 cost of Hot MixzNo milling requiredzNo build up at curb linezUtility casting adjustment not necessaryzMinor inconvenience to traveling publiczHigh production levels leads to less time on projectzEco-FriendlyzHot Mix appearance zHas high friction surfacezMinimal loose aggregatezProtects underlying pavement (5-8 years)zExtends pavement lifezExcellent wearing coursezProven performerzCorrects minor surface distresseszNight time applicationsKeys To SuccessKeys To SuccesszProper site selectionzGood specifications (enforced) & Mix DesignzProper roadway preparationzProper equipment (match equipment to project)zAccurate equipment calibration zMaterial consistency (use materials with history of past performance)zContractor performance (use seasoned workforce)

4 ZQuality project inspectionzAgency Industry PartneringzInformation chip SealChip SealSEAUPG 2009 CONFERENCE-HILTON HEAD ISLAND, SOUTH CAROLINAA chip seal chip seal of an asphalt binder to a roadway surface followed by application of aggregate which is then rolled & swept prior to returning the roadway to serviceA good chip seal canA good chip seal all-weather surfacezProtect the underlying pavementzWaterproof the road s surfacezSeal small crackszImprove surface frictionzExtend service lifezImprove safety By improving skid resistanceWhere can chip Seals be Where can chip Seals be AppliedAppliedzOver prepared basezTwo lane rural roadszSecondary Highways & RouteszInterstate Highways - requires site specific materials & applications- depends on Agency tolerance is it appliedHow is it applied?? asphalt DistributerThenNowAsphalt DistributerSEAUPG 2009 CONFERENCE-HILTON HEAD ISLAND, SOUTH CAROLINAChip seal Binder chip seal Binder VariationsVariationszHot Tire RubberzHot asphalt CementzConventional asphalt emulsionszPolymer Modified EmulsionszRejuvenating EmulsionszCutbacksAggregatesAggregatesNa tural & SyntheticNatural & SyntheticzCrushed gravelzCrushed stonezLimestone zBasalt (Trap Rock)zExpanded Clay & Shale (lightweight) chip seal quality depends chip seal quality depends ononzSite SelectionzProject Specific Design FactorzCondition of surfacezQuality materials (consistency)-Clean AggregatezWell maintained equipmentzContractor performancezApplication techniquezTraffic controlzWeather (avoid cool weather applications)- seasonal limitations applyChip seal quality conChip seal quality con ttzTimely, quality prep work (90-180 days ahead)

5 ZProject specific specifications (Understand that plans are only a guide and that each road requires special considerations)zInspect surface (day of application) to determine rates and make knowledgeable adjustments in the variable rate spray bars and modified emulsions/asphalts on higher volume roadwayszTimely application of asphalt and aggregate to optimize aggregate embedmentzRe-visit your jobs from previous years to learn what works and what did 2009 CONFERENCE-HILTON HEAD ISLAND, SOUTH CAROLINAP reservation Preservation Costs?Costs?Average Cost of Average Cost of MaintenanceMaintenancez1 1/2 HMAC $95, - $103, Less than 3 $23, $40, seal (conventional) $4, - $5, seal (rejuvenating emulsion) $7, - $8, seal $19, - $23, zMicro Surfacing (single)$24, - $27, Surfacing (double)$48, - $54, seal $18, - $25, (materials only) $70, - $90, Per mile 20 wideMicrosurfacing & chip Microsurfacing & chip Seals are Seals are ExcellentExcellentPavement Pavement Preservation ToolsPreservation ToolsSummaryInternational Slurry Surfacing Emulsion Manufacturers , Center for Pavement of InformationQuestions Questions Thank You!

6 Tim HarrawoodVance Brothers, Southern Contracting DivisionSEAUPG 2009 CONFERENCE-HILTON HEAD ISLAND, SOUTH CAROLINA