Relationship between fiber orientation/distribution and post-cracking behaviour in ultra-high-performance fiber-reinforced concrete (UHPFRC) |
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| Affiliation: | 1. CONSTRUCT-LABEST, Department of Civil Engineering, Faculty of Engineering (FEUP), University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal;2. SYSTEC, Department of Electrical and Computer Engineering, Faculty of Engineering (FEUP), University of Porto, Rua Dr. Roberto Frias, s/n, 4200-465 Porto, Portugal;1. Department of Architectural Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, Republic of Korea;2. Department of Civil Engineering, The University of British Columbia, 6250 Applied Science Lane, Vancouver, BC V6T 1Z4, Canada;3. Department of Civil Engineering, Daegu University, 201 Daegudae-ro, Jillyang-eup, Gyeongsan-si, Gyeongsangbuk-do 38453, Republic of Korea;4. School of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea;1. Department of Civil Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark;2. Department of Structural Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway;3. Department of Civil and Environmental Engineering, University of California, Davis, CA 95616, USA;1. School of Civil Engineering, Dalian University of Technology, Dalian, China;2. CSIRO Manufacturing, Melbourne, Australia |
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| Abstract: | The relationship between fiber orientation/distribution and post-cracking behaviour in ultra-high-performance fiber-reinforced concrete (UHPFRC) was quantitatively evaluated. A circular UHPFRC panel was cast from its center and prismatic specimens were cut at angles of 0, 30, 60 and 90° between the specimen axis and the radial direction of the panel. The post-cracking behaviour was assessed with three-point bending tests, and fiber orientation/distribution throughout the panel was then evaluated using image analysis and 3D visualization of fiber orientation based on X-ray computed tomography (CT) data. The post-cracking flexural strengths of the specimens cut at angles of 60, 30 and 0° were 80, 40 and 10% of that for the specimens cut at an angle of 90°, indicating perfect linear dependence on the contribution of fibers near the fracture surfaces. Two rectangular UHPFRC panels with a 1:2 width/length ratio were cast, and similar fiber orientation characteristics were found for the circular and rectangular panels. |
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| Keywords: | UHPFRC Fiber orientation/distribution Post-cracking flexural behaviour Image analysis 3D visualization of fiber orientation analysis |
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