Effects of blending fibers on tensile resistance of ultra high performance fiber reinforced concrete under impact
Corressponding author's email:
kiettt@hcmute.edu.vnKeywords:
Blending fibers, High strain rates, Ultra high performance fiber reinforced, Concrete, Impact resistance, toughnessAbstract
The effects of blending fibers including two types of macro fiber, steel (S-) and polyam- ide (P-), and one type of micro fiber, polyamide (p-), on direct tensile behavior of ultra-high- performance hybrid-fiber-reinforced concrete (UHPHFRC) at high strain rates (10 and 47 s-1) were 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 pro- duced 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 notice- ably improve the impact resistance of S-UHPHFRCs, especially for strain capacity and peak toughness.
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