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

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

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

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

How are the Section Performing? DateActivitySection(s) June 1995Partial depth patching of PCC pavements at joints December 1995 Partial depth patching of PCC pavements at joints and PCC Slab Replacement April 1997Partial depth patching of PCC pavements at joints June 2002PCC Slab Replacement September 2004PCC Slab Replacement April 2005 Transverse joint sealing and lane-shoulder longitudinal joint sealing June 2008Partial depth patching of PCC pavements at joints June 2010Partial depth patching of PCC pavements at joints June 2012 Full depth transverse joint repair and full depth patching of PCC pavement other than at joint June 2012Full depth transverse joint repair June 2012PCC slab replacement Overview of Maintenance/Rehabilitation Treatments

Longitudinal Cracking

Transverse Cracking

200202

Roughness

Roughness

Pavement Deflections

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

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 – , , , Transverse Drain located in Section Median drain 4 feet below surface in Section  Vertical curves exist within the limits of the test sections

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

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

Factsheets

Factsheets

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