Utilization of UHPC Bridge Superstructures in Texas— Volume 3: UHPC Production Guidelines and Design Recommendations with Design Examples
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2023-10-01
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Edition:Technical Report: September 2018–October 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 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 3 research report documents production guidelines, design guidelines, and design examples for precast, pretensioned UHPC girders. The production guidelines describe nonproprietary UHPC mixture design, mixing procedures, transport, placement, finishing, curing, and evaluation methods. The design recommendations document the design procedure for UHPC bridge girders with a composite conventional concrete deck slab. The design guidelines are developed based on the full-scale girder testing results. The design recommendations consider the UHPC draft specifications under consideration by AASHTO and the results of testing UHPC girder specimens. The design guidelines are supplemented with two detailed design example calculations. The Tx34 design example explores the advantage of UHPC to reduce the number of girder lines for a bridge span. The Tx54 design example highlights the potential of UHPC to increase the span length of highway bridge structures in Texas.
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