United States Department of Transportation
i
Audubon Parkway Slab Lifting at MP 22.75 — Bridge Approach and Departure Settlement
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2019-06-01
[PDF-465.76 KB]
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Abstract:The approach/departure Portland Cement Concrete (PCC) panels on the eastbound and westbound side of Audubon Parkway at MP 22.75 over route KY 2120 began to exhibit settlement and cracking in a few locations, which created an uncomfortable ride for motorists. To address this problem, the Kentucky Transportation Cabinet (KYTC) contracted with MasterDry to repair the PCC panel settlement. MasterDry claims that its two-part polyurethane material expands into a rigid foam that fills voids, stabilizes slabs, and lifts concrete. The polyurethane material is injected through 5/8-inch holes drilled in the PCC panel. Once injected, a chemical reaction converts the liquid urethane components to a strong, rapidly-setting foam material. With a compressive strength of 100 pounds per square inch, polyurethane offers the necessary strength to support heavy loads. At the request of KYTC the Kentucky Transportation Center (KTC) has monitored and evaluated the performance of MasterDry’s polyurethane foam treatment. To determine effectiveness of the lifting agent, elevation data were collected. A falling weight deflectometer (FWD) was used to assess the condition of in situ base materials and load transfer efficiency (LTE).
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