LTPP Lessons Learned: Delaware SPS-2
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Transcript of LTPP Lessons Learned: Delaware SPS-2
LTPP Lessons Learned:LTPP Lessons Learned:Delaware SPS-2Delaware SPS-2
Wednesday April 9, 2014
SPS-2 Tech Day, Dover, DE
Gabe CiminiProject Manager, LTPP North Atlantic Regional
Support Contractor (NARSC)
Delaware SPS-2 Delaware SPS-2 Lessons Learned OverviewLessons Learned Overview
How are the Sections Performing?
Construction Related Performance Issues
Overview of Performance
What Lies Ahead?
Delaware SPS-2 Delaware SPS-2 Lessons Learned OverviewLessons 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 stipulates 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 wet-freeze environment by LTPP definitions
Construction completed and section opened to traffic - May1996
Delaware SPS-2 LayoutDelaware SPS-2 Layout
How are the Section Performing?How are the Section Performing?Overview of Maintenance/Rehabilitation Treatments
Sequence Date Activity Section(s)
1April 1996
Full Depth Transverse Joint Repair Patch
100209
2May 1996
Full Depth Transverse Joint Repair Patch
100210
3June 2000
Grinding Surface
100201100204100205100208100209100210100212100259
4June 2002
Transverse Joint Sealing and Lane-Shoulder Longitudinal Joint Sealing
100210
5June 2006
Lane-Shoulder Longitudinal Joint Sealing
100207100208100211
6June 2008
Crack Sealing 100207
7March 2011
Crack Sealing 100207Partial Depth Patching of PCC Pavement Other Than at Joint
100207100211
Patch Pot Holes - Hand Spread, Compacted with Truck
100207
Patch Pot Holes - Hand Spread, Compacted with Truck
100208
8May 2012
Partial depth patching of PCC pavements at joints and Partial
Depth Patching of PCC Pavement Other Than at Joint
100208
Longitudinal CrackingLongitudinal Cracking
Longitudinal CrackingLongitudinal Cracking
100207
Transverse CrackingTransverse Cracking
Transverse CrackingTransverse Cracking
100205
RoughnessRoughness
RoughnessRoughness
100208
100206
Pavement DeflectionsPavement Deflections
Pavement DeflectionsPavement Deflections
100201
100212
Construction Related Construction Related Performance IssuesPerformance Issues
Subgrade Eight of the 12 test sections contained partial shallow
cuts that did not meet the specifications. Sections were excavated and received 12 inches of Type A borrow
DGAB Bases did not extend the full width of the shoulder
Construction Related Construction Related Performance Issues (cont.)Performance Issues (cont.)
LCB
During paving of the LCB layer, depressions in the subgrade occurred during stoppage of the paver. Transverse shrinkage cracks developed in the LCB layer prior to PCC paving, and some of these shrinkage cracks developed in the depression areas
PCC
7 sections have PCC slab thickness that exceed the allowable tolerance of ± ½ inch
Construction Related Construction Related Performance Issues (cont.)Performance Issues (cont.)
Both Flexural Strength values (14 day MPa) are over by more than 10% of design averages
550 PSI (Actual averages = 657 PSI)(Type B Mix – 650PSI) 900 PSI (Actual averages = 757 PSI)
No. 57 Stone was used as the edge drain backfill instead of PATB
No joint sealant was used between the mainline concrete pavement and the asphalt shoulder
Construction Related Construction Related Performance Issues (cont.)Performance Issues (cont.)
Sections 100205, 100201, 100209 received new PCC to replace original that showed early shrinkage cracks (Type B mix - 3000PSI Compressive Strength)
Sections 100206 and 100202 were also replaced (900PSI Flexural strength)
Before removing concrete coring of transverse and longitudinal shrinkage cracks showed cracks extended either entirely or partially through the PCC but not into the underlying LCB. No bond was found to occur between the PCC and the underlying LCB
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. Sections 100209, 100210, 100211, 100212, 100259, 100260)
Maintenance/rehabilitation treatments were effective at reducing cracking and faulting
What Lies Ahead?What Lies Ahead?
LTPP monitoring to continue
SPS-2 Pavement Preservation Pooled Fund Study (2013 to 2016) – Partners - AZ, CA, CO, GA, KS, NC, WA
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