Assessment of the Uretek process on continuously reinforced concrete pavement, jointed concrete pavement, and bridge approach slabs : technical assistance report.
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Assessment of the Uretek process on continuously reinforced concrete pavement, jointed concrete pavement, and bridge approach slabs : technical assistance report.

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English
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  • Alternative Title:
    Assessment of the Uretek process on continuously reinforced concrete pavement, jointed concrete pavement, and bridge approach slabs.
  • Creators:
  • Corporate Creators:
    Louisiana Transportation Research Center
  • Corporate Contributors:
    Louisiana. Dept. of Transportation and Development
  • Subject/TRT Terms:
  • Publication/ Report Number:
    03-2TA
  • Resource Type:
    Tech Report
  • Geographical Coverage:
    Louisiana
  • Corporate Publisher:
    Louisiana Transportation Research Center
  • Abstract:
    This study evaluates the rehabilitation method utilizing the injection of Uretek (polyurethane) into the pavement structures on continuously reinforced concrete pavement (CRCP), jointed concrete pavement (JCP), and bridge approach slabs. The polyurethane injection was used to fill voids and level the CRCP and bridge approach slabs. On JCP, it was used to reduce faulting, fill voids, and underseal.

    Testing results indicated that injecting polyurethane into the pavement structure is an effective method of leveling CRCP and bridge approach slabs. On the CRCP and bridge approach slabs, IRI values were reduced from 33 to 68 percent, while as much as 2 inches of depression was removed from the slabs.

    The polyurethane injection process filled pavement voids as demonstrated by trenching in the JCP and core samples in the CRCP and bridge approach slabs. In the CRCP and bridge approach slabs, the polyurethane was dense. However, varying layers of stiffness ranging from soft to dense were found in samples taken from the JCP. This variation could be problematic, and the causes warrant further investigation through additional research.

    Forensic investigation of both the trenched slab and patched areas on the JCP proved to be insightful. Both the trenched and patched slabs were visually inspected. The adjacent slabs in the left lane, which had been previously injected with polyurethane in April 2002, were observed under traffic loading. The joints in the left lane were seen significantly deflecting under traffic and water was seen flowing through the joint and slab, indicating that the polyurethane did fill the voids but did not appear to provide much support to the joints. It should be noted that the star lug load transfer devices were not functioning.

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