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Interim Guidelines: The Design and Use of Foamed Bitumen Treated Materials Kim Jenkins, Dave Collings Hechter Theyse, Fenella Long Road Pavements Forum

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  • Interim Guidelines:The Design and Use of Foamed Bitumen Treated Materials

    Kim Jenkins, Dave Collings Hechter Theyse, Fenella Long

    Road Pavements Forum6 7 May 2002

  • Where are we?Guideline prepared and reviewedFinalizing document in light of reviewsThank you, dont stop now!

  • ReviewersElzbieta Sadzik, Theuns Lewis and Enrico Fletcher, GautransLes Sampson, Asphalt AcademyPiet Myburgh, SABITAWouter Schreuder and Joe Grobler, VKEMervyn Henderson and Rassie Otte, PAWCWolf Reusch, RumdelDieter Vietze and Philip Kuun, Blitz AsphaltJop du Plessis, AA Loudon and PartnersIan van Wijk and Johan Calitz, AfriconNicol van der Walt, Gibb AfricaAndre Ungerer, Keeve SteynMike White, UWP Engineers

  • Table of Contents1. Introduction2.Selection criteria for identification of suitable projects3.Mix design4.Structural design5.Construction aspectsAppendicesTest procedure for measuring foamed bitumen characteristicsLaboratory test methods and specimen preparationMechanistic-empirical pavement design for foamed bitumen treated layers

  • Chapter 2.Selection CriteriaProject SelectionRisk AssessmentRecycling ProcessEnvironmental AdvantagesTraffic Delay AdvantagesEconomic Considerations

  • Chapter 2.Selection Criteria

  • Chapter 3.Mix DesignImportant considerations in the mix design processDesign constraintsAggregate selectionBinder selection Fluid considerations Mixing techniquesCompaction (mod AASHTO)CuringMoisture susceptibilityAppropriate surfacings

  • Aggregate Selection, Magic Triangle020406080100100806040200100806040200% of STONES% OF FILLER% OF SANDFILLER SKELETONSTONESKELETONSANDSKELETONHigh optimum binder content foamed bitumen mixIdeal foamed mix gradingSuitable foamed mix grading

  • Chapter 3.Mix Design (cont.)Mix design procedureMix design philosophyMix constituentsSample preparationCuringMechanical testing

  • Mix Design PhilosophyImproved flexibilityGreater permanent deformation resistanceUnbound material, High quality crushed stone and aggregateModerate quality natural gravelLow quality natural gravelFoamed bitumen and emulsion treated material without cementStrongly cemented material C2 to C1Lightly cemented material C4 to C3Stiff, brittle behaviourHighHighIntermediateIntermediateLowLowNoneNoneBituminous binder0%7%0%CatalystStrengthCement5%Asphalt concreteFoamed bitumen and emulsion treated material containing cementPresumed economically not viable

  • Material ClassificationInterim foamed bitumen treated material classification

  • Chapter 4.Structural DesignResearch based onHVS testsLaboratory testsDistress modesEffective fatiguePermanent deformation resistanceBalance the distress modes

  • Chapter 4.Structural DesignNew pavementsCataloguesDeep in situ recyclingDesign chartsMaterialsFB2, FB3 only

  • New Construction, Catalogue

  • Deep In Situ Reycling, Design Charts

  • Chapter 5.Construction AspectsGeneralBasic requirementsQuality of foamed bitumenMaterial being mixesBefore startingPlanning the recycling workEquipment selectionLogistical planningTrial sections

  • Equipment Selection

  • Chapter 5.Construction AspectsWorking with foamed bitumenMixing processMoisture contentPlacing and compactionSurfacing

  • Chapter 5. Construction AspectsQuality control aspectsThickness Quality of foamed bitumenApplication of stabilising agents and quality of mixingCompactionLevel and surface shape

  • Recommendations for Future WorkMix designBuild up database of shear parameters to move away from UCSReplace ITS test for assessing flexibility (beam?)Compaction specifications, Mod AASHTO versus BRD, build up experience and establish limitsLaboratory versus field mixingCuringWater sensitivity

  • Recommendations for Future WorkStructural designFB1, FB4 materialsWider range of parent materialsMix behaviour/performance with no active fillerErodibility, permeability, durabilityMore advanced material models

  • Recommendations for Future WorkHVS testing