South-Africa-Road

BriefOverviewofSouthAfric[e-mail]logyForumXi’an,Saanxi,China29May2004Area=1.2mkm2.Population=±45m(0.01%growthrate).Capital=PretoriaBoundaryCountriesMozambique,Zimbabwe,Botswana,Namibia,SwazilandandLesotho.Coastline=2800kmNaturalResourcesGold,Chromium,Coal,IronOre,Manganese,Nickel,Phosphates,Uranium,Diamonds,Platinum,Copper,Vanadium,SaltandNaturalgas.Scopeofpresentation•Novelroadstructuresandsubgradeimprovement•Asphaltsurfacings•Bitumenrubber•MaintenanceissuesTypicalCrossSectionTypicalgranularbasestructures10M30M100MG1/G2Highqualitygradedcrushedstone;C3Stabilisedsubbase,1500kPaNote.G1compactedto88%bulkdensity,G2compactedto84–86%bulkdensityUnderlyingsupportminimum15CBRIMPACTCOMPACTIONAFTER10YEARSCONVENTIONALCOMPACTIONAFTER7YEARSReasonsforusingimpactcompaction….Improvedperformance:TypicalGradings0204060801000.0750.150.30.61.182.364.759.513.2SieveSize(mm)Cumulative%passingPorousSMAContinuousGapTransportekWheelTrackTestTransportekWheelTrackTestBitumenrubberCrack-ActivityMeter•Verticalandhorizontalcrackmovementsimultaneously•Fitsbetweendualwheels•ElectronicdataprocessingTestSpecimenDisplacementMeasurementusingLVDTLoadCellServo-HydraulicActuatorRotationalBearingLoadingFrameTranslationalBearingsBendingBeamFatigueTestFigure3.Fatiguelivesatoptimumbindercontent10010001.E+031.E+041.E+051.E+061.E+07FatigueLifeMicrostrain6,5%Bit-Rub;Superpave5,5%60/70pen;Superpave5,0%60/70pen;ContinuousFigure5.Fatiguecomparisonateffectivebindercontentof5,5%10010001.E+031.E+041.E+051.E+061.E+07FatigueLifeMicrostrainBit-Rub;Superpave60/70pen;Superpave60/70pen;Continuous75mmConventional38mmBR-HMA-GG25mmBR-HMA-GG175,000reps@40kN25,000reps@80kN175,000reps@40kN62,000reps@80kN13,000reps@-5ºC175,000reps@40kN62,000reps@80kNResistanceofBRAtorutting•PerformanceauditshaveshownthatnoruttingfailurescouldbedirectlyattributedtotheBRAsphalt•BRwasusedsuccessfullyonporousasphalt;therewasnoruttingSupplySuppliedinbagsSuppliedinbulkSurfacingRoadsurfacingwithmechanicalpaverSurfacingLabourintensiveSurfacingOperationsFrombulksuppliesSuppliedinbagsRoadrehabilitationandrepairsEmergencyrepairsinwetconditionsRoadrehabilitationandrepairsRoadrehabilitationandpatchingofprovincialroadsStreetpatchingPatchinginverycoldconditionsIndustrialapplicationCoverageofwaterproofingIndustrialapplicationsCushioningofsteeltankbasesWarehousefloorsParkingandhandlingareasHealth,safetyandenvironmentalinformation•Non-toxic•Non-flammable•Non-corrosive•Non-contaminant•Innocuoustoanimalandvegetablelife•Acoldapplication•SafetouseanddoesnotrequireanyprotectionforitsapplicationTheproductisenvironmentallyfriendlyRoadmixis:ContactinformationFormoreinformation,contactdirectors:Mr.KimMingKennethKa(M.I.E.ACEA)Cell:[phone]Mr.J.W.R.Henning(BSc.B.Eng)Cell:[phone]Mr.RichardT.Scheppel(HonsBCom)Cell:[phone]Mrs.RhonaI.Scheppel(I.B.S.A)Cell:[phone]Mrs.CoraJ.S.Henning(BSc)Cell:[phone]Tel:[phone]Fax:[phone]E-mail:[e-mail](GeneralandBusiness)[e-mail](Technical)[e-mail](Marketing)POBox75784,LynnwoodRidge,0040,Pretoria,R.S.AMAINTENANCESTRATEGIESROADPAVEMENTDESIGNPROCEDURE02040608010019972002200720122017YearVCIGoodFairPoorVeryPoorMaintenanceActionsNoMaintenanceMoistureIngress(TypicallyDesignedforTrafficExpectedover20Years)IDEALMAINTENANCE020406080100200020022004200620082010YearRoadConditionRepairCost=R0,1mill/kmGoodFairPoorVeryPoorMAINTENANCEDELAYEDFOR3YRS020406080100200020022004200620082010YearRoadConditionGoodFairPoorVeryPoorRepairCost=R0,6mill/km3Years1POOR=6GOODMAINTENANCEDELAYEDFOR5YRS020406080100200020022004200620082010YearRoadConditionGoodFairPoorVeryPoorRepairCost=R1,8mill/km5Years1VERYPOOR=18GOODVehicleOperatingCostvsRoadConditionGoodPoorRoadAgencyCostRoadUserCostTotalCostPoorVerygoodMaintenanceLevelLowCostHighCONCLUSIONS•Novelpavementstructure•Irregularwheelcompactor•Asphaltmixes/coldasphalt•Bitumenrubber•MaintenanceissuesFinalslide