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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