United States Department of Transportation
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Utilization of UHPC Bridge Superstructures in Texas— Volume 1: UHPC Mixture Development and Material-Level Experiments
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2023-10-01
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[PDF-36.83 MB]
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Edition:Technical Report: September 2018–August 2022
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Abstract:The use of ultra-high performance concrete (UHPC) in Texas bridges has the potential to add substantial improvements to bridge construction. Advanced material properties and superior durability of UHPC can result in significant design and construction benefits. Within this context, this project evaluated the application of UHPC for precast, pretensioned bridge girders. The project scope included a detailed review and synthesis of the relevant literature, analytical feasibility study, development of nonproprietary UHPC mixture designs using locally available materials, material-level experiments for selected UHPC mixtures, fabrication of precast, pretensioned UHPC bridge girder specimens at a precast plant in Texas, full-scale experiments to understand UHPC girder behavior, nondestructive evaluation (NDE) of UHPC girders, fiber distribution and orientation analysis, and development of UHPC production and design guidelines and design examples. Nonproprietary UHPC mixtures were successfully developed to achieve high early strength (14 ksi within 24 hours) for precast applications with desirable outcomes in terms of material properties and durability. Large volume production and girder fabrication were successfully carried out at a precast plant. This Volume 1 research report documents the state-of-the-practice and state-of-the-art for UHPC research conducted domestically and internationally, the development process for eight nonproprietary UHPC mixtures, optimization of a selected UHPC mixture with materials commonly used in precast plants in Texas, and development of a practical mixing procedure for large volume production in precast plant environments. In addition, this volume details the investigation of fresh, hardened, and durability properties of lab-made and plant-made nonproprietary UHPC. Finally, the fabrication of three UHPC girder specimens is documented, along with the NDE of the girders and analysis of cored samples, to assess fiber distribution and orientation and voids by employing X-ray, infrared, and conventional image analysis techniques.
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