Experimental Assessment of Ultra-High-Performance Fiber-Reinforced Concrete for Bridge Applications
摘要
This study extensively evaluated the mechanical properties of Ultra-High-Performance Fiber-Reinforced Concrete (UHPFRC) through a series of standardized tests, including flexural tensile strength, compressive strength, flow table test, and tensile strength. The flexural tensile strength test on prismatic specimens demonstrated UHPFRC’s exceptional strength and ductility, exhibiting performance approximately 250 times greater than normal concrete, characterized by linear elastic behavior, displacement-hardening, and deflection-softening phases. Compressive strength tests revealed UHPFRC’s superior performance, with specimens failing at 141 MPa, which is two to three times stronger than conventional concrete. The flow table test indicated high workability, achieving a flow diameter of 230 mm, facilitating easier handling and placement. Tensile strength tests showed significant improvements, with average values ranging from 7 to 10 MPa for UHPC and up to 12 MPa for UHPFRC, significantly enhanced by the inclusion of steel fibers. Adding 3% fiber to the mortar increased tensile strength by nearly 2.5 times compared with mortar without reinforcement. Overall, UHPFRC offers superior mechanical properties, making it ideal for high-performance and durable concrete structures. This research highlights UHPFRC’s potential to address modern construction challenges with its enhanced strength, durability, and workability, making it suitable for advanced structural applications, particularly in bridge construction. Future research should focus on optimizing mix designs and exploring further applications to maximize UHPFRC’s benefits in various structural contexts.