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Abstract:Tri-Dyne Industries has developed precast concrete paving slabs (PCPS) that connect using tongue and groove joints and overlap joints, as shown in Figure 1 (1). This proprietary system is referred to as the “Pro-Active Paving SystemTM” and consists of a series of steel reinforced PCPS containing valves that allow fill material to be injected through the PCPS into voids created by subsidence or base course/subgrade deterioration. Advantages cited by Tri-Dyne for this system are: 1) Subsidence in the pavement structure can be quickly abated by injecting leveling material into the subgrade, 2) multiple subsidence events can be addressed, as the injection ports are reusable with the appropriate injection material, 3) PCPS can be removed and replaced with cranes, allowing for repairs to the subgrade or underlying utilities, should they be present, and 4) PCPS are stronger than conventional pavements and, as a result are longer lasting.
Tri-Dyne PCPS is in the developmental phase and has never been constructed on roadways. TriDyne Industries requested in July of 2005 that the Louisiana Department of Transportation and Development (DOTD) assess the prototype Tri-Dyne PCPS to determine wheteher they would be suitable for use on roadways. The project did not begin until January of 2007, due to circumstances caused by Hurricane Katrina.
Tri-Dyne constructed a test section consisting of six PCPS panels with cast in place approach slabs at the Hanson concrete plant entrance in New Orleans, LA. This report summarizes the assessment of that test section conducted by the Louisiana Transportation Research Center (LTRC).
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