1. Overview of the SPS-2 National Experiment Tuesday July 16, 2013 Abilene, KS Jack Springer, P.E. FHWA Highway Research Engineer

2. Presentation Overview  Quick Introduction to LTPP  Review of SPS-2 Experiment Purpose National SPS-2 Experimental Design Lay of the Land Today

3. 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.

4. LTPP’s GOAL is… HOW and WHY to provide answers to pavements perform as they do!

5. LTPP Objectives  Evaluate existing design methods.  Develop improved design methodologies and strategies for the rehabilitation of existing pavements.  Develop improved design equations for new and reconstructed pavements.  Determine the effects of loading, environment, material properties and variability, construction quality, and maintenance levels on pavement distress and performance.  Determine the effects of specific design features on pavement performance.  Establish a national long-term database to support SHRP’s objectives and to meet the future needs of the highway industry.

6. LTPP’s CORE FUNCTIONS  Data Collection and Management  Data Analysis  Product Development

7. Test Sections

9. LTPP on the Web Connect to LTPP website through: http://www.fhwa.dot.gov/research/tfhrc/pro grams/infrastructure/pavements/ltpp/

10. SPS-2 Purpose  Determine the influence of concrete strength and pavement drainage on PCC pavement performance Neither had quality experimental field data  Find impact of widened lanes  Determine impact of other design factors (slab thickness, base type)

11. SPS-2 Purpose (cont.)  Planned products Evaluation of existing design methods Development of improved design equations New and reconstructed pavements Effects of specific design features on pavement performance Development of a comprehensive database for pavement community

12. National SPS-2 Experimental Design

13.  Primary Site Factors Temperature: Freeze and No-Freeze Precipitation: Wet and Dry Subgrade: Fine Grained and Course Grained

14. National SPS-2 Experimental Design Subgrade Climatic Condition WetDry Freeze No-FreezeFreezeNo-Freeze Fine Ohio, Kansas (J) North Carolina (N) * (R)* (V) Michigan, Iowa (K) Arkansas (O)North Dakota (S)* (W) Coarse Delaware (L) *(P) Nevada, Washington (T) California (X) Wisconsin (M) * (Q)Colorado (U)Arizona (Y) * = Cell not filled

15. Lay of the Land Today

16.  13 of 14 Projects are Active Kansas SPS-2 first one constructed 84% (174/206) Section are Active  SPS-2 Pavement Preservation Pooled Fund: http://www.pooledfund.org/Details/Solicit ation/1336. http://www.pooledfund.org/Details/Solicit ation/1336

17. Thank You ! Any Questions?