Abstract
This study highlights the size impact on the fracture characteristics of ultra-high-performance fiber-reinforced concrete (UHPFRC) under flexure and tension through a series of experiments. The studied UHPFRC contained 1 % twisted steel macro and 1 % smooth steel microfiber by volume. The flexural specimens were rectangularly prism-shaped, while the tensile specimens were bell-shaped. To assess the size impact, only the volume change was investigated in flexure, while changes in gauge length, thickness, section area, and volume were studied in tension. The partial/total energy, partial/total toughness, and length of the cohesive zone of UHPFRC were determined. First, the studied UHPFRC produced a normal size effect on partial/total fracture toughness, complementary toughness, and microcrack number in both flexure and tension. The hardening fracture toughness was noticeably higher than the complementary toughness. Second, the length of the cohesive zone of UHPFRC was much higher than that of conventional concrete. Third, the Weibull modulus values of UHPFRC for the hardening fracture toughness, complementary toughness, and number of microcracks per 100 mm were drawn based on the Weibull statistical theory. The normal size effect of UHPFRC on these parameters under tensile load was more obvious than that under flexural load.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
