Contribution to ultra-high performance concrete deck overlay of post-tensioned box-girder bridges

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Date
2023-08
Authors
Sreekumar, Nayana
Major Professor
Sritharan, Sri
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Shafei, Behrouz
Ashlock, Jeremy
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Abstract
A bridge deck is one of the most vulnerable portions of the bridge for deterioration, owing to heavy traffic exposure and the subsequent wear and tear. Thus, mechanisms to rehabilitate and improve the deck surface are an evolving research field. Post tensioned box girder bridges are an important subcategory of bridges that are very prevalent in California, for its capability to span long distances with better deflection control. The idea presented in the current study is to rehabilitate the deck surface of post-tensioned box-girder bridges by applying an overlay of ultra-high performance concrete (UHPC). A comparative study was conducted to see if the overlay application with the replacement of thin layer, as proposed in the study, would perform better than the conventional full-deck removal process. The displacement growth and the stresses induced on the structure, during and after rehabilitation, show promising results for implementing the proposed strategy. Material study was also conducted to identify the suitable parameters of four UHPC overlay mixes available in the market. The characterization included flow test and slope test and compressive strength test. A study was also conducted to understand the influence of the curing period on the compressive strength of specimens, to establish the optimum wait period to allow traffic on a rehabilitated deck surface. The bridges observed for the study are representative bridges from California and the research is conducted with Caltrans's guidance, including their implementation requirements and current practices.
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2023