Ultra-high performance concrete (UHPC) represents an emerging class of fiber-reinforced cementitious materials whose mechanical and durability properties far exceed that expected from conventional concrete. Infrastructure owners are moving rapidly to consider the applicability of UHPC. However, the lack of structural design guidelines, material standards, and testing/qualification procedures is hindering the widespread adoption of the technology. The Federal Highway Administration’s UHPC research program has, since its inception 22 years ago, been a recognized leader in the execution of material- and structural-scale research on UHPC and of delivering those research results to the broader community of potential users. There are currently significant opportunities for advancing the knowledge base in UHPC structural performance, material test methods, and structural engineering design methodology. The presented opportunity will position the selected candidate at the forefront of UHPC applied engineering research.
References
El-Helou, R., and B. Graybeal. 2022a. “Flexural Behavior and Design of Ultrahigh-Performance Concrete Beams.” Journal of Structural Engineering, 148(4), doi: 10.1061/(ASCE)ST.1943-541X.0003246.
El-Helou, R., and B. Graybeal. 2022b. “Shear Behavior of Ultrahigh-Performance Concrete Pretensioned Bridge Girders.” Journal of Structural Engineering, 148(4), doi: 10.1061/(ASCE)ST.1943-541X.0003279.
El-Helou, R., and B. Graybeal. 2023. “Shear Design of Strain-Hardening Fiber-Reinforced Concrete Beams.” Journal of Structural Engineering, 149(2), doi: 10.1061/JSENDH.STENG-11065.
El-Helou, R., Z. Haber, and B. Graybeal. 2022. “Mechanical Behavior and Design Properties of Ultra-High Performance Concrete.” ACI Materials Journal, 119(1), 181-194, doi: 10.14359/51734194.
Graybeal, B., and F. Baby. 2013. “Development of Direct Tension Test Method for Ultra-High-Performance Fiber-Reinforced Concrete.” ACI Materials Journal, 110(2), 177–186.
Graybeal, B., E. Brühwiler, B.-S. Kim, F. Toutlemonde, Y. Voo, and A. Zaghi. 2020. “International Perspective on UHPC in Bridge Engineering.” ASCE Journal of Bridge Engineering, 25(11), doi: 10.1061/(ASCE)BE.1943-5592.0001630.
Graybeal, B., and R. Helou. 2023. Structural Design with Ultra-High Performance Concrete. Report No. FHWA-HRT-23-077. Washington DC: Federal Highway Administration.
Haber, Z., I. De la Varga, B. Graybeal, B. Nakashoji, and R. El-Helou. 2018. Properties and Behavior of UHPC-Class Materials. Report No. FHWA-HRT-18-036. Washington, DC: Federal Highway Administration.
Mohebbi, A., and B. Graybeal. 2022. “Prestress Loss Model for Ultra-High Performance Concrete.” Engineering Structures, 252: 113645, doi: 10.1016/j.engstruct.2021.113645.
Mohebbi, A., B. Graybeal, and Z. Haber. 2022. “Time-Dependent Properties of Ultrahigh-Performance Concrete: Compressive Creep and Shrinkage.” Journal of Materials in Civil Engineering, 34(6), doi: 10.1061/(ASCE)MT.1943-5533.0004219.
Muzenski, S., Z. Haber, and B. Graybeal. 2022. “Interface Shear of Ultra-High Performance Concrete.” ACI Structural Journal, 119(1), 267–280, doi: 10.14359/51733008.
Muzenski, S., Z. Haber, and B. Graybeal. 2023. “Monolithic and Non-Monolithic Interface Shear Performance of Ultra-High Performance Concrete.” Engineering Structures, 281: 115667, doi: 10.1016/j.engstruct.2023.115667.
Russell H, Graybeal B: “Ultra-High Performance Concrete: A State-of-the Art Report for the Bridge Community.” FHWA Report HRT-13-060: June 2013, 171 pp.
Ultra-high performance concrete; Fiber reinforced concrete; Mechanical testing; Structural testing; Direct tension testing; Fiber orientation; Bridge; Structural design; Structural behavior; Pretension; Post-Tension
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