Performance based testing for design of area wide ... - roads.co.nz
Performance based testing for design of area wide ... - roads.co.nz
Performance based testing for design of area wide ... - roads.co.nz
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Creating ConnectionsEast Waikato MaintenanceContractNetwork Budget ForecastFlat-lined budget until 2014/15 Season.2011/12 Total Network BudgetReduced by 11% <strong>co</strong>mpared to theprevious five year average.Existing 5-Year Hybrid Lump Sum ContractCollaboratively renegotiated a reducedlump sum, retaining existingper<strong>for</strong>mance criteria.2013
Creating ConnectionsEast Waikato MaintenanceContractPotential <strong>of</strong> <strong>Per<strong>for</strong>mance</strong>-<strong>based</strong> rehabilitation<strong>design</strong>.Saving <strong>of</strong> 12% on rehabilitation <strong>co</strong>sts.Historic Aust<strong>roads</strong> ApproachOverlay aggregate and 1.5% cementstabilised.New <strong>Per<strong>for</strong>mance</strong>-<strong>based</strong> ApproachDesign specifically <strong>for</strong> the rehabilitation.2013
Creating Connections<strong>Per<strong>for</strong>mance</strong> Based DesignsRepeated Load Triaxial Tests on test pit aggregate – East Waikato Hybrid- How good is the existing material in the road?300 thousand loadsPoor result existing-Needs cement and,-Flexural Beam TestGood result-Traditionaltreatment2013
Creating ConnectionsDesign from Flexural Beam TestFlexural beam tests optimises cement/binder <strong>co</strong>ntent and depthStabilised MaterialDSubgrade SoilPoor resultExistingStabilisation:How deep (D)?How much cement/binder?To little cement – too weakTo thin – will breakTo thick – une<strong>co</strong>nomic2013
2013Creating ConnectionsRe<strong>co</strong>mmended Testing/DesignRELIES ON AGGREGATEINTERLOCKLOW QUANTITIES OF BINDERFOR STRENGTH WHEN WETNOINSITU ROAD AGGREGATECRAP?YESRELIES ON CEMENT BONDSUNBOUND GRANULAR DESIGNFLEXURAL BEAM TESTTENSILE STRENGTHDESIGN
Creating Connections<strong>Per<strong>for</strong>mance</strong> Based DesignsRepeated Load Triaxial Tests on test pit aggregate – East Waikato Hybrid- How good is the existing material in the road?300 thousand loadsPoor result existing-Needs cement and,-Flexural Beam TestGood result-Traditionaltreatment2013
2013Creating ConnectionsTensile Strength DesignINSITU ROAD AGGREGATECRAP?YESFLEXURAL BEAM TEST
Creating ConnectionsFlexural Beam Testing2013
Creating ConnectionsCIRCLY Output2013
Creating ConnectionsCIRCLY OutputCement 5000MPa Tensile Strength is 1.7MPaMaximum damage values <strong>for</strong> each vehicle type-------------------------------------------Vehicle Type Damage Factor Critical Stress (MPa)------------ ------------- ---------------ESA750-Full .18964E+02 -0.77 E+00Maximum <strong>of</strong> total damage= 18.96374Granular, E=200MPaMaximum damage values <strong>for</strong> each vehicle type-------------------------------------------Vehicle Type Damage Factor Critical Strain------------ ------------- ---------------ESA750-Full .18906E-02 0.21726E-03Maximum <strong>of</strong> total damage= 1.8905672E-03Subgrade,CBR4,AnisoMaximum damage values <strong>for</strong> each vehicle type-------------------------------------------Vehicle Type Damage Factor Critical Strain------------ ------------- ---------------ESA750-Full .20516E-03 0.34793E-03Maximum <strong>of</strong> total damage= 2.0516428E-04-ve because in tension(0.77 MPA)2013
Creating ConnectionsPavement Cross-SectionTaihape to Napier Road – Low VolumeStabilised Material,E CT CTs t_ct250mm Cement StabilisedSubgrade CBR=6%CIRCLY CalculatedTensile Stress = 380 kPa2013
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