MTU CE 5403 - PAVEMENT CONDITION SURVEYS

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Slide 1Instructional ObjectivesNeed for Condition SurveysTypes of SurveysDistress SurveysDistress Surveys TypesPaserPaser Distress-AsphaltPaser Distress-ConcreteLTPP DistressLTPP Distress-AsphaltLTPP Distress-ConcretePaver DistressPaver Distress-AsphaltPaver Distress- ConcreteRide Quality IRI (International Roughness Index)ROUGHNESS SURVEYIRI CALCULATIONRide Quality RUT DEPTH MEASUREMENTWHAT IS REPORTED?SAMPLE DATA AGGREGATIONStructural CapacityStructural Evaluation Destructive TestingStructural Evaluation Non-Destructive TestingAutomated Distress SurveysAutomated Condition Survey EquipmentClasses of Automated Data CollectionRolling Weight DeflectometerSlide 29Slide 30Distress Data CollectionDrainage SurveysPavement failure is caused by:Signs of Deficient DrainageHow Much Data to Collect?Network SamplingSection SamplingFrequency of SurveysSlide 39PAVEMENT CONDITION SURVEYSLecture 4Instructional ObjectivesNeed for condition surveysCollection methodologiesFour basic types of condition surveysDifferent procedures and equipment availableNeed for Condition SurveysEvaluate current condition of pavementDetermine rates of deteriorationProject future conditionsDetermine maintenance & rehabilitation needsDetermine costs of repairsPrepare plans for repairsTypes of SurveysDistress SurveysStructural CapacityRoughness (Ride Quality)Skid Resistance (Surface Friction)Distress SurveysType of distressSeverityExtent of distress present on the pavementDistress Surveys TypesPaserPaverSHRPAsphalt InstituteTexas Transportation InstitutePaser Asphalt ConcreteGravel RoadsPaser Distress-AsphaltUses visual inspection techniquesSurface defectsSurface deformationCracksPatches and potholesPaser Distress-ConcreteUses Visual inspection techniques—Surface defects—Joints—Pavement cracks—Pavement deformationLTPP DistressAsphaltConcreteLTPP Distress-AsphaltCrackingPatching and potholesSurface deformationsSurface defectsMisc distressLTPP Distress-ConcreteCrackingJoint deficienciesSurface defectsMisc distressesPaver Distress AsphaltConcretePaver Distress-AsphaltAlligator crackingBlock crackDistortionsLongitudinal and transverse crackingPatching and utility cutsRuttingPaver Distress- ConcreteBlow-ups and BucklingCorner breakD crackingLinear crackingPolished aggregatePumpingRide QualityIRI (International Roughness Index)IRI is calculated from longitudinal profile measured with a road profiler in both wheelpaths. The average IRI of the two wheelpaths is reported as the roughness of the pavement section.ROUGHNESS SURVEYSurvey the outside lane.For undivided highways survey one direction.For divided highways survey the outside lane in both directions.For each survey cycle use the same direction(s) of travel and survey lane(s).IRI CALCULATIONInternational Roughness Index (IRI) - The IRI is computed from a single longitudinal profile using a quarter-car simulation as described in the report, "On the Calculation of IRI from Longitudinal Road Profile." [Sayers 95]Ride QualityRUT DEPTH MEASUREMENT1.7 m3 RuttingSensorsWHAT IS REPORTED?3 P o i n t M e a s u r e m e n t e v e r y 1 5 . 0 m e t e r s8 6 0 m m8 6 0 m mR u t D e p t hD DD2 312D2D1D3SAMPLE DATA AGGREGATION051015202530354045Level 1 Level 2Level 3 Level 4 Severity LevelPercent of Measurements within the SectionStructural CapacityNot routinely collected for pavement monitoringMainly used for selecting and designing rehabilitation strategiesCan reduce maintenance and rehabilitation costsStructural EvaluationDestructive TestingCoringLaboratory testingExcavation of pitsField CBRStructural EvaluationNon-Destructive TestingBenkelman BeamDynaflectRoad RaterFWDRolling DeflectometerGPRAutomated Distress SurveysIncrease speed and ease of data collectionReduce transcription errorsIncrease consistency between classification and quantificationIncrease safety of field crewsAutomated Condition Survey EquipmentUsed by most states to collect:–Pavement friction–Roughness–Profile–Rut depth–Deflection dataClasses of Automated Data CollectionDistress images collected on film or high resolution video and:–analyzed while the vehicle collects data–analyzed in the office after data collection–analyzed after data collection by viewing the imagesLasers are used to determine changes in surface textureRolling Weight DeflectometerPrimary objectives are:–Develop an RWD suitable for network level analysis–Collect data at speeds of 50 mph–Output will be a structural index–Measure maximum deflection, pavement temperature, station numbers, and day and time of testRolling Weight DeflectometerPhase I –Identified deflection measurementsPhase II–Highway speeds–Deflection response converted to a structural indexRolling Weight DeflectometerObjective is to compare relative structural strengthsIdentify weak linksDeflection basins, magnitudes, loads and temperaturesProcessed in real timeContinuously measured at 1 foot intervalsDistress Data CollectionVisual surveyLaser technologyFilm-based systemsVideo systemsDrainage SurveysPoor drainage causes poor pavement performanceWater on a pavement can:–create a hazard to motorists–saturate the subgrade soil–deteriorate the pavementPavement failure is caused by:Load–Load capacity can be increased by an overlayMoisture–If proper drainage is not provided during rehabilitation, the same moisture related distress will recurSigns of Deficient DrainageStanding water in ditchlinesConcentrated weed growth in ditchline or edge of pavementEvidence of water ponding on shoulderDeteriorated joint or crack sealantsAny evidence of pumpingHow Much Data to Collect?To support network-level analysis–Sampling processesTwo sampling procedures:–Network sampling–Section samplingNetwork SamplingLess samples needed when total number in the whole increasesTo determine average condition:–Sample 2 - 5%To predict the distribution of condition:–Sample 10 - 25%To predict cost of repairs, restorations:–Sample 30 - 35%Most states survey 10%Section SamplingTo identify sections of pavement in a selected condition level, the condition of each section must be definedIf a windshield survey is used:–entire section should be inspectedIf a walking or automated survey is used:–a portion of


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