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Full-Text Articles in Engineering
Determing The Effect Of Thermal Treatment Timing On Ultra-High Performance Concrete Beams, Christopher H. Mullen
Determing The Effect Of Thermal Treatment Timing On Ultra-High Performance Concrete Beams, Christopher H. Mullen
Dissertations, Master's Theses and Master's Reports - Open
The loss of prestressing force over time influences the long-term deflection of the prestressed concrete element. Prestress losses are inherently complex due to the interaction of concrete creep, concrete shrinkage, and steel relaxation. Implementing advanced materials such as ultra-high performance concrete (UHPC) further complicates the estimation of prestress losses because of the changes in material models dependent on curing regime.
Past research shows compressive creep is "locked in" when UHPC cylinders are subjected to thermal treatment before being loaded in compression. However, the current precasting manufacturing process would typically load the element (through prestressing strand release from the prestressing bed) …
Preliminary Investigation Of Ultra-High Performance Concrete Behavior At High Strain Rates Using The Split-Hopkinson Pressure Bar, Jacob Clark
Dissertations, Master's Theses and Master's Reports - Open
Ultra-high performance concrete (UHPC) displays several enhanced material properties compared to normal strength concrete (NSC). In past research, Split-Hopkinson pressure bar (SHPB) tests have been used for normal strength concrete to determine material behavior at high strain rates. The behavior of advanced concrete materials, such as UHPC, under high strain rates has not been thoroughly investigated. While it is generally accepted that concrete materials experience increases in compressive strength under increasing strain rates, a preliminary investigation was conducted to gain insight into the compressive behavior of UHPC under high strain rate SHPB testing.
In this research, 50 specimens were tested …