1. 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

2. 2 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. 2 The GOAL is to answer HOW and WHY pavements perform as they do.

3. 3 3 LTPP Data – All Encompassing

4. 4 Database Security  Central Process  QC/QA  Data Upload Production Database Data mining LTPP Data- THE Long-Term Pavement performance DATABASE research-grade

5. 5 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 5

6. 6 Data Mining – Case Study 2 Virgin vs. Recycled 6  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

7. 7 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. 7

8. 8 Research Results- Coordinated Analysis Program  Publications  Findings  Guidelines  Design  Videos  Data  Software Tools

9. 9 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 9

10. 10 Questions Dedicated Customer Service – ltppinfo@dot.govltppinfo@dot.gov Search Engine Key Words – FHWA LTPP ltpp-products.com Visit our Booth!