沥青双层表处施工-2

1、Page1Section424—BituminousSurfaceTreatment424.1GeneralDescriptionThisworkincludesplacingoneormoreapplicationsofbituminousmaterialandaggregateonapreviouslypreparedbaseorpavement.424.1.01DefinitionsSingleSurfaceTreatment:Oneapplicationofbituminousmaterialthatiscoveredwithaggregate.DoubleSurfaceTreatment:Abituminousmaterialapplicationthatiscoveredwithaggregateofthesizespecifiedintheproposalfollowedbyasecondbituminousmaterialapplicationthatiscoveredwithasecondspecifiedsizeaggregate.TripleSurfaceTre。

2、atment:Abituminousmaterialapplicationthatiscoveredwithaspecifiedsizeaggregatefollowedbysubsequentapplicationsofbituminousmaterialthatarecoveredwithsuccessivelysmallersizenominalaggregates.424.1.02RelatedReferencesA.StandardSpecificationsSection105—ControlofWorkSection800—CoarseAggregateSection820—AsphaltCementSection824—CationicAsphaltEmulsionB.ReferencedDocumentsQPL65424.1.03SubmittalsGeneralProvisions101through150.424.2MaterialsA.BituminousMaterialSelectthebituminousmaterialfromanytypeandgrade。

3、listedinthematerialstablebelow.NotifytheEngineeratleast10daysbeforeorderingthebituminousmaterial.TheEngineermustapprovethebituminousmaterialchoice.Foralistoflatexsources,seeQPL65.EnsurethatmaterialsmeettherequirementsofthefollowingSpecifications:MaterialSectionAsphaltCement,PerformanceGradePG58-22orPG64-22*820.2.01CationicAsphaltEmulsion,GradeCRS-2horCRS-3*824.2.01CoarseAggregate,ClassACrushedStoneorCrushedSlag,GroupIorII800.2.01*UsePG64-22orCRS-3onlyattheEngineer’sdirection.(SeeSubsection424.3.。

4、05.B.)B.AggregatesThesizeandgroupofaggregatesusedinthesurfacetreatmentarespecifiedintheProposalundertheappropriateLineItem.Section424—BituminousSurfaceTreatmentPage2DonotuseunconsolidatedlimerockunlessprovidedforinthePlansorProposal.UseClassBaggregatesonlywherethesurfacetreatmentisusedforshoulderconstructionorwhereitistobeoverlaidwithasphalticconcrete.424.2.01Delivery,Storage,andHandlingGeneralProvisions101through150.424.3ConstructionRequirements424.3.01PersonnelGeneralProvisions101through150.42。

5、4.3.02EquipmentHavetheEngineerapproveequipmenttypesandquantitiesbeforeusingequipmentontheProject.Ensurethattheequipmentusedtoconstructthesurfacetreatment:ProducesworkthatcomplieswiththestandardsinthissectionIsontheProjectandinproperworkingorderbeforeconstructionbeginsA.AggregateSpreaderTheDepartmentwillinspectannuallytheaggregatespreaderbeforeitisusedinthework.Ifthespreaderisapproved,theDepartmentwillattachanequipmentcertificationstickertothespreader.Useaself-propelledaggregatespreaderthatcanapp。

6、lyaggregateatthedesiredrateuniformlyandaccuratelywithoutcorrugation,overlaps,orexcessdeficientareas.Ensurethatthespreadercanspreadcoursestotherequiredwidths.Providespreaderstopromptlycoverthefullwidthoftheasphaltapplication.B.PressureDistributorTheDepartmentwillinspectannuallythepressuredistributorbeforeitisusedinthework.Ifthedistributorisapproved,theDepartmentwillattachanequipmentcertificationstickertothedistributor.Thepressuredistributorshouldbeequippedasfollows:1.Mountthepressuredistributoron。

7、pneumatictireswideenoughtopreventdamagetotheroadsurface.2.Design,equip,maintain,andoperatethedistributorsothatthebituminousmaterialwillbeheatedandappliedevenlythroughoutthelengthofthespraybars.Ensurethatitmaintainsaconstant,uniformpressureonthenozzles.3.Installscreensbetweenthetankandthenozzlesandcleanthemfrequentlytopreventclogging.4.Useanadjustabledistributorthatcandelivercontrolledamountsofbituminousmaterialfrom0.04to1.0gal/yd²,±0.02gal/yd²(0.18to4.53L/m²,±0.10L/m²)upto24ft(7.2m)widewithoutat。

8、omization,streaking,orpulsationintheflow.5.Useadistributorequippedwiththefollowing:AtachometerandthermometerstoindicatetheapplicationrateandthetemperatureofthetankcontentsMeasuringdevicestoaccuratelyindicatetheamountofbituminousmaterial,ingallons(liters),inthedistributorbeforeandaftereachapplicationFullcirculatingspraybarsthatcanbeadjustedlaterallytoconformtoastringlineandcapableofverticalandhorizontaladjustment.Apositiveshut-offcontroltopreventdrippingbituminousmaterialontheroadwaySection424—Bi。

9、tuminousSurfaceTreatmentPage3AdistributortankequippedwithasamplevalveinasafeandconvenientlocationtoobtainbituminousmaterialsamplesC.HeatingEquipmentEnsurethatheatingequipmentwillheatandmaintainthebituminousmaterialuniformlyatthetemperaturerequired.Provideanaccuratethermometer.D.Smooth-WheeledRollersUseself-propelled,tandem-typesmooth-wheeledrollersthatcanbealternatedwithpneumatic-tiredwheels.Therollersshallweighfrom3to8tons(3to7Mg).Ensurethattherollerweightswithintheselimitscanproperlycompactthe。

10、materials.E.Pneumatic-TiredRollersUseself-propelledpneumatic-tiredrollerswithtreadsthatwillnotdisturbtheaggregates.Rollerswithpneumatic-tiredwheelsthatcanbealternatedwithasteeldrumarealsopermitted.F.PowerBroomandPowerBlowerProvideatleastonepowerbroomandonepowerblower,oracombinationpowerbroomandblower,thatcanremovedustorloosematerialsfromtheroadsurface.424.3.03PreparationFirmlycompact,finish,andprimenewbases.Ensurethatthebasesconformtothelines,grades,andcrosssectionswithinthetolerancesspecified.A.。