This research investigated the effects of adding micro fibers on the direct tensile behavior of ultra-high-performance hybrid-fiber-reinforced concrete (UHPHFRC) at high strain rates. Macro fiber was long smooth fiber (LS, Df=0.3mm, Lf=30mm) and micro fiber was short smooth fiber (SS, Df=0.2mm, Lf=13mm). The volume content of macro fibers was 1.0% and the volume content of micro fibers varied between 0.0 and 1.0%. The addition of micro fibers clearly increased the tensile strength of UHPHFRCs even at high strain rates.

• 박준길(세종대학교 건설환경공학과) | PARK, Jun Kil
• 박승훈(세종대학교 건설환경공학과) | PARK, Seung Hun
• 김동주(세종대학교 건설환경공학과) | KIM, Dong Joo 교신저자