1. LTPP Lessons Learned: Kansas SPS-2 July 17, 2013 Abilene, KS Gabe Cimini Database Manager, LTPP NRSC

2. Kansas SPS-2 Lessons Learned Overview  How are the Sections Performing?  Construction Related Performance Issues  What Lies Ahead?

3. Kansas SPS-2 Lessons Learned Overview  SPS-2 experiments examine effects of climatic region, subgrade soil and Traffic rate on doweled jointed plain concrete pavement  Structural factors include drainage, concrete thickness, base type, concrete flexural strength and lane width  Requires that all test sections be constructed with perpendicular joints at 4.9 m spacing and stipulate a traffic load level in the lane in excess of 200,000 ESALs per year  The Climate for this SPS-2 project is considered to be a dry, freeze environment by LTPP definitions  Construction began January 1992  Construction completed July 1992

4. How are the Section Performing?  Maintenance and Rehabilitation over time  Longitudinal Cracking over Time  Transverse Cracking over Time  Roughness over Time  Pavement Deflections over Time

5. How are the Section Performing? DateActivitySection(s) June 1995Partial depth patching of PCC pavements at joints200204 December 1995 Partial depth patching of PCC pavements at joints and PCC Slab Replacement 200201 April 1997Partial depth patching of PCC pavements at joints200204 June 2002PCC Slab Replacement200201 September 2004PCC Slab Replacement200201 April 2005 Transverse joint sealing and lane-shoulder longitudinal joint sealing 200201 200202 200203 200204 200205 200206 200207 June 2008Partial depth patching of PCC pavements at joints 200205 200207 June 2010Partial depth patching of PCC pavements at joints200205 June 2012 Full depth transverse joint repair and full depth patching of PCC pavement other than at joint 200201 200202 200205 200207 June 2012Full depth transverse joint repair200204 June 2012PCC slab replacement200206 Overview of Maintenance/Rehabilitation Treatments

6. Longitudinal Cracking

8. Transverse Cracking

9. 200202

10. Roughness

11. Roughness

12. Pavement Deflections

13. Construction Related Performance Issues  Construction delayed due to an extremely wet and rainy season  Type C flyash was used to help “dry-up” and stabilize the subgrade  Contractor experienced many problems trying to place the PATB. Trimming was often required to obtain the desired thickness  Several sections have PCC thickness that exceed the allowable tolerance of ¼ inch

14. Construction Related Performance Issues (cont.)  Several underground structures exist within the limits of the test sections 18 inch median drains located 5 feet or more below Box culverts – 200204, 200208, 200209, 200211 Transverse Drain located in Section 200210 Median drain 4 feet below surface in Section 200211  Vertical curves exist within the limits of the test sections

15. Overview of Performance  More maintenance/rehabilitation treatments were required for sections with No Drainage  Sections with Drainage reported less cracking and lower maximum wheel path faulting as well as lower initial deflections with more sections performing better over time.  Maintenance/rehabilitation treatments were effective at reducing cracking and faulting values

16. What Lies Ahead?  LTPP monitoring to continue  Potential for SPS-2 Pavement Preservation Pooled Fund Study  FactSheets available for Sections  Data available on InfoPave

17. Factsheets

18. Factsheets

19. LTPP InfoPave

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21. LTPP InfoPave LAUNCH: TRB 2014

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