Bridge construction; Concrete; Deterioration; Mix design; Quality control; Traffic loads; Ultra high performance concrete
Deterioration of bridges can often be related to poor performance of longitudinal connections between concrete members or transverse deck joints. Impacts from traffic and pressure buildup at joints due to expansion joints filled with debris can lead to physical deterioration at the joints. Ultra-high performance concrete (UHPC) has great potential for application in bridge connections and rehabilitation in Oklahoma. It has the potential to be used as a durable replacement/repair material for the areas immediately adjacent to expansion joints or as a connection material to make simply supported precast members continuous for live load, among many other possible applications. This project will consist of evaluating available proprietary UHPC materials and mix designs made with local materials for applicability to bridge joint installation and repair in Oklahoma. Mix designs will be developed using local materials and several methods of obtaining optimal particle packing density. Mixing methods utilizing typically available concrete mixers will be examined to determine required mixing procedures. This work will be combined with information available in the literature to produce draft specifications for UHPC materials, mixing methods, placing methods, and quality control in Oklahoma. Development of specifications guiding the use of locally available constituents in UHPC and for quality control will allow implementation of UHPC in many applications.