Pennsylvania DOT I-90


Location - Interstate 90, Erie County Segment 280

Pursuant to meetings between URETEK USA and PennDOT, a cooperative pilot project was developed and executed in 2012. The purpose of the pilot project was to assess the improvement of transverse joint performance in concrete pavements following injection of high-density polyurethane. Expansive, high-density, two-component, water-resistant polyurethane was injected into the foundation soils of the pavement system using the URETEK Deep Injection (UDI) process.

Certain problems were cited by Pennsylvania Department of Transformation including poor joint load transfer and high incidence of water in base and subbase - intermittent reflective cracking in friction course.

PennDOT provided URETEK USA the following information regarding the I-90 Test Site: 

Pavement Cross-Section
0.625″ Ultra-thin Friction Course – 13.0″ PCC
4.0″ Open-Graded Subbase (OGS) – 6.0″ A-2 Subbase
Subgrade = Composition Unknown 
After injection there was significant reduction in the size of voids in the vicinity of the joints along with dramatic improvement in the LTEs for the transverse joints.

Pre-Injection Falling Weight Deflectometer (FWD)

URETEK USA stabilized 140 continuous feet of the eastbound (EB) travel lane for a segment of I-90 (identified by PennDOT) using the traditional URETEK Deep Injection (UDI) process. In addition, URETEK USA also stabilized 6 transverse joints within that 140’ test area using a specialized application of the UDI process known as Joint Vicinity Injection (JVI). PennDOT performed post-injection Falling Weight Deflectometer (FWD) testing and analysis to assess void reduction and improvement in load transfer efficiency (LTE). Post-injection testing occurred at least 24 hours after completion. Post-injection results are also presented in the PennDOT-provided table.  

Results

After injecting the test area using the URETEK Deep Injection (UDI) process, post-injection FWD testing and data analysis by PennDOT revealed significant reduction in the size of voids in the vicinity of the joints along with dramatic improvement in the LTE's for the transverse joints.
135%
Average Improvement
Calculation of % in Load Transfer Efficiency (LTE) =
((Post LTE-Pre LTE/Pre LTE) * 100%
22%
Minimum Improvement
Per Joint
200%
Maximum Improvement
Per Joint

Pre/Post Injection Testing Results

After injecting the test area using the URETEK Deep Injection (UDI) process, post-injection FWD testing and data analysis by PennDOT revealed:
Joint #1
Pre-Injection
10%
Post-Injection Testing
30%
Joint #2
Pre-Injection
24%
Post-Injection Testing
77%
Joint #3
Pre-Injection
13%
Post-Injection Testing
48%
Joint #4
Pre-Injection
27%
Post-Injection Testing
33%
Joint #5
Pre-Injection
18%
Post-Injection Testing
45%
Joint #6
Pre-Injection
25%
Post-Injection Testing
47%

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