| A bridge's deck deteriorates the fastest among all the bridge components and needs to be repaired, rehabilitated or even replaced after certain years of service. Since bridge deck overlays are one of the most common bridge deck rehabilitation methods used in Alberta, it was decided to investigate the effectiveness of different bridge deck rehabilitation overlay methods. This study reviews definition of five different bridge deck overlays, as well as their specification and mix design in Alberta. The effectiveness of these bridge deck overlays is discussed by service life prediction model and the result is compared with expert opinion method results. The impact of traffic and rehabilitation time on the service life is analyzed. The effectiveness of two main types of high performance bridge deck overlays, silica fume and fiber reinforced silica fume concrete overlays, is discussed. It is concluded that fiber enhances the overall performance of high performance concrete overlay. |
