Download - LTPP Lessons Learned: Kansas SPS-2
LTPP Lessons Learned:LTPP Lessons Learned:Kansas SPS-2Kansas SPS-2
July 17, 2013
Abilene, KS
Gabe Cimini
Database Manager, LTPP NRSC
Kansas SPS-2 Lessons Learned Kansas SPS-2 Lessons Learned OverviewOverview
How are the Sections Performing?
Construction Related Performance Issues
What Lies Ahead?
Kansas SPS-2 Lessons Learned Kansas SPS-2 Lessons Learned OverviewOverview
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?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?How are the Section Performing?
Date Activity Section(s)
June 1995 Partial depth patching of PCC pavements at joints 200204
December 1995Partial depth patching of PCC pavements at joints
and PCC Slab Replacement200201
April 1997 Partial depth patching of PCC pavements at joints 200204June 2002 PCC Slab Replacement 200201
September 2004 PCC Slab Replacement 200201
April 2005Transverse joint sealing and lane-shoulder
longitudinal joint sealing
200201200202200203200204200205200206200207
June 2008 Partial depth patching of PCC pavements at joints200205200207
June 2010 Partial depth patching of PCC pavements at joints 200205
June 2012Full depth transverse joint repair and full depth patching of PCC pavement other than at joint
200201200202200205200207
June 2012 Full depth transverse joint repair 200204
June 2012 PCC slab replacement 200206
Overview of Maintenance/Rehabilitation Treatments
Longitudinal CrackingLongitudinal Cracking
Longitudinal CrackingLongitudinal Cracking
Transverse CrackingTransverse Cracking
Transverse CrackingTransverse Cracking
200202
RoughnessRoughness
RoughnessRoughness
Pavement DeflectionsPavement Deflections
Construction Related Construction Related Performance Issues 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 Construction Related Performance Issues (cont.)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
Overview of PerformanceOverview 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?What Lies Ahead?
LTPP monitoring to continue
Potential for SPS-2 Pavement Preservation Pooled Fund Study
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