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Strain Rate Effects on Tensile Behavior of Ultra High Performance Hybrid Fiber Reinforced Concrete

Tran Tuan Kiet, Kim Dong Joo

Abstract


Strain rate effect on direct tensile behavior of ultra-high-performance hybrid-fiberreinforced concrete (UHPHFRC) containing two types of macro fiber, steel (S-) and polyamide (P-), and one type of micro fiber, polyamide (p-), at high strain rates (10 and 47 s-1) was investigated. The volume content of macro fiber was maintained as 1.0%, whereas that of micro fiber varied from 0.0 to 1.5%. The UHPHFRCs with steel macro fibers (S-UHPHFRC) produced much higher rate sensitive tensile behavior than those with polyamide macro fibers (P-UHPHFRC). As the volume content of micro polyamide fibers increased, P-UHPHFRC produced higher rate sensitivity on post cracking tensile strength whereas S-UHPHFRC showed lower sensitivity. A proper amount of micro polyamide fibers, 0.5% in this study, would noticeably improve the impact resistance of S-UHPHFRCs, especially for strain capacity and peak toughness.

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