Comparative electromechanical damage-sensing behaviors of six strain-hardening steel fiber-reinforced cementitious composites under direct tension |
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| Affiliation: | 1. Department of Civil Engineering, Gaziantep University, Gaziantep, Turkey;2. Department of Building and Construction Engineering, University of Technology, Baghdad, Iraq;3. Department of Civil Engineering, Adana Science and Technology University, Adana, Turkey;4. Department of Civil Engineering, Selçuk University, Konya, Turkey;5. Department of Civil Engineering, Gazi University, Ankara, Turkey;1. Department of Civil Engineering, Adana Science and Technology University, Adana, Turkey;2. Department of Civil Engineering, Gazi University, Ankara, Turkey;3. Department of Building and Construction Engineering, University of Technology, Baghdad, Iraq;4. Department of Civil Engineering, Selçuk University, Konya, Turkey;5. Department of Civil Engineering, Hacettepe University, Ankara, Turkey;1. School of Civil Engineering, Dalian University of Technology, Dalian 116024, China;2. School of Transportation and Logistics, Dalian University of Technology, Dalian 116024, China;3. Department of Mechanical Engineering, New York Institute of Technology, New York, NY 11568, USA;4. School of Machinery and Automation, Wuhan University of Science and Technology, Wuhan 430081, China;5. School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China;1. Department of Mechanical Engineering, University of the Basque Country UPV/EHU, Plaza Ingeniero Torres Quevedo 1, 48013 Bilbao, Spain;2. LabMAT, Department of Civil and Environmental Engineering, University of Bío-Bío, Concepción, Chile;1. Chalmers University of Technology, Division of Structural Engineering, Sweden;2. Norwegian University of Science and Technology, Department of Structural Engineering, Norway;3. Thomas Concrete Group AB, Sweden;4. Norwegian Public Roads Administration, Norway;5. University of Ioannina, Department of Materials Science and Engineering, Greece |
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| Abstract: | This research investigates the electromechanical damage-sensing behavior of strain-hardening steel fiber-reinforced cement composites (SH-SFRCs) with six types of steel fibers (1.5% volume fraction content) within an identical mortar matrix (90 MPa). The six types of steel fibers studied are long twisted (T30/0.3), long smooth (S30/0.3), long hooked (H30/0.375), medium twisted (T20/0.2), medium smooth (S19/0.2), and short smooth (S13/0.2) steel fibers. The damage-sensing behavior was evaluated by measuring the changes in the electrical resistance during direct tensile tests. The electrical resistivity of the SH-SFRCs clearly decreased as the tensile strain increased until the post-cracking point, owing to the generation of multiple micro-cracks during strain-hardening. All the SH-SFRCs investigated had nominal gauge factors ranging between 50 and 140; these values are much higher than the commercially conventional gauge factor, which involves metal and is around 2. Both T30/0.3 and T20/0.2 produced the highest gauge factor, i.e., the best damage-sensing capacity, whereas S13/0.2 produced the highest electrical conductivity. |
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| Keywords: | A. Fibers B. Fiber/matrix bond B. Electrical properties B. Mechanical properties |
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