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Implementation of performance-based bridge deck protective systems.

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  • Abstract:
    When considering the durability of a bridge, the concrete deck is often the most vulnerable component and can be the limiting factor 

    affecting service life.  To enhance the durability of both new and existing bridge decks, a protective system is often provided to prevent 

    or delay the ingress of chlorides and moisture to the reinforcing steel.  In the state of Indiana, this protective system typically comes in 

    the form of a concrete overlay or a thin polymer overlay.   Another protective system widely used in the United States and in many 

    countries internationally consists of a waterproofing membrane overlaid with asphaltic concrete.  Due to a history of poor performance 

    in the 1970’s and the 1980’s, a moratorium has been placed on the installation of waterproofing membranes in Indiana.   This study 

    reevaluates the state‐of‐the‐practice  of  bridge  deck  protection  in  Indiana  with the  goal  of  enhancing the  Indiana Department  of 

    Transportation’s toolbox of bridge deck protective systems.  Consideration was given to the state‐of‐the‐art and state‐of‐the‐practice in 

    bridge  deck  protective systems  used  by  other state  transportation  agencies  as  well  as  by  international  transportation  agencies.  

    Research  focused  on the  practice  of  installing  waterproofing membranes  and the  latest technologies  being  used.    Based  on the 

    information gathered, various protective systems were evaluated, and recommendations are provided on the selection of the most 

    appropriate systems  for  various  bridge  conditions.    Furthermore,  a recommendation  is  provided  to remove  the  moratorium  on 

    membrane systems so that the benefits of this system can be more fully explored and realized.

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