Feasibility of Non-Proprietary Ultra-High Performance Concrete (UHPC) for use in Highway Bridges in Montana: Phase II Field Application

US Transportation Collectionhttps://doi.org/10.21949/15183112021PDFTech ReportBerry, MichaelScherr, RileyMatteson, KirstenWestern Transportation InstituteMontana State University (Bozeman, Mont.). College of EngineeringMontana. Dept. of Transportation. Research ProgramsUnited States. Department of Transportation. Federal Highway AdministrationMontana. Dept. of Transportation. Research ProgramsUnited StatesHighway bridgesUltra high performance concreteAdmixturesBridgesBridge constructionBuilding materialsCompressive strengthFiber reinforced concreteConcrete bridgesMaterials testsTensile strengthTensile propertiesadaptation and useFHWA/MT-21-002/9578-606MSU G&C #4W7141 MDT Project #9578-606Final Report March 20 I 8 -March 2021The overall objective of this research was to further develop and characterize an economical non-proprietary ultra high performance concrete (UHPC) made with materials readily available in Montana. Specifically, this research focused on (1) investigating the potential variability in performance related to differences in constituent materials, (2) investigating issues related to the field batching/mixing of these UHPC mixes, and (3) testing rebar bond strength and studying how this will affect requisite development lengths. Based on this research, it was determined that, while variations in the source of the constituent materials had some effects on performance, the effects were fairly minor, with all recorded flows and 28-day compressive strengths exceeding 6 inches and 16 ksi, respectively. Further, in regard to the effects of mixing/batching conditions, only temperature was observed to have a significant effect on performance, with flows and set times decreasing with increasing temperature. Regarding the pullout tests, all of the specimens that met the minimum embedment depth requirements specified by the FHW A yielded prior to concrete bond failure, indicating the suitability of these recommendations for the Montana UHPC developed in this research.120