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LTPP – Case Studies in Performance Data Mining
Transportation Data Palooza – Processing Data Track
May 9, 2013
US DOT HQ, Washington, D.C.
Yan (Jane) Jiang, P.E.
TFHRC HRDI-30, LTPP Team
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LTPP Mission Statement
To increase pavement life by investigation of various designs of pavement structures and
rehabilitated pavement structures, using different materials and under different loads, environments,
subgrade soil, and maintenance practices.
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The GOAL is to answer HOW and WHY pavements perform as they
do.
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ENVIRONMENTENVIRONMENT
TRAFFICTRAFFIC
CONSTRUCTIONCONSTRUCTION
STRUCTURESTRUCTURE
MAINTENANCEMAINTENANCE
Measure(s)Measure(s)ofof
ServiceabilityServiceabilityoror
DeteriorationDeterioration
LayerLayerThicknessesThicknessesLayer TypesLayer Types& Properties& Properties
VariationsVariationsin Thicknessin Thickness& Properties& Properties
SubgradeSubgrade Type Type& Properties& Properties
MoistureMoisture
Radiation Radiation
TemperatureTemperature(Min., Max,(Min., Max,
00 Days, etc.) Days, etc.)Freeze-thawFreeze-thaw
CyclesCycles
Axle GroupAxle GroupLoadsLoadsTire TypesTire Types& Pressures& Pressures
TreatmentsTreatments
Axle Spacing,Axle Spacing,Speed,Speed,RepetitionsRepetitions MethodsMethods
QualityQualityTimingTiming
TimingTiming
MethodsMethodsAs-Built QualityAs-Built Quality
VarianceVariance
AgeAge
LTPP Data – All Encompassing
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Q&
A
Send
Data
TrainingDatabase Security
Central Process
QC/QA
Data Upload Production
Database
Q&A
Data mining
Educate
LTPP Data- THE Long-Term Pavement performance DATABASE
research-grade
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Data Mining – Case Study 1 AASHTO Pavement ME Design
First national new Mechanistic-empirical pavement design procedure, not possible without LTPP data
LTPP data mined to develop performance models and national calibration
Database is being mined to perform State calibration
Techniques include simulation, finite element analysis, traditional statistics, and advanced modeling, etc.
Providing significant cost savings to DOTs
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Data Mining – Case Study 2 Virgin vs. Recycled
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Evaluated use of recycled materials in asphalt concrete
Statistical analyses to compare performance vs. material
Knowledge discovery = virgin and recycled perform similarly
Cost savings to DOTs
Increased sustainability
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Data Mining – Case Study 3 Ad hoc Analysis/Training
Hundreds of TRB, ASCE, etc. papers written using data
Academia has embraced LTPP
Data mined for variety of knowledge discovery purposes Model development/calibration Quality management Design features Climate effects Materials performance
Training for future data miners, part of curriculum in some engineering schools.
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Research Results- Coordinated Analysis Program
Publications
Findings
Guidelines
Design
Videos
Data
Software Tools
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Looking into the future—LTPP and TPM
LTPP has the only national, consistent, high quality data set for development of pavement performance measures
Spans all pavement types, climate, loading conditions
24 year+ performance history
LTPP data collection standards used in HPMS
Can be mined for (among other uses): Establishing G/F/P performance thresholds Sensitivity of TPM measures on performance Validating current/future TPM performance prediction models
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Questions
Dedicated Customer Service – [email protected] Engine Key Words – FHWA LTPP
ltpp-products.com
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