Synergy assessment in hybrid Ultra-High Performance Fiber-Reinforced Concrete (UHP-FRC) |
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| Affiliation: | 1. Department of Structural, Building and Geotechnical Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy;2. Construction Technology Research Department, Land and Housing Institute, Expro-ro, Yuseong-gu 539-99, 34047 Daejon, South Korea;3. Department of Architecture and Building Science, School of Engineering, Tohoku University, 6-6-11-1212, Aoba, Aramakiaza, Aoba-ku, Sendai 980-8579, Japan;1. Department of Chemical and Materials Engineering, Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro – RJ, Brazil;2. Department of Civil and Environmental Engineering, Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro – RJ, Brazil;1. Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics, School of Science, Wuhan University of Technology, Wuhan 430070, PR China;2. Huanggang Normal University, Huanggang 438000, Hubei Province, PR China;1. Dokuz Eylül University, Engineering Faculty, Department of Civil Engineering, Buca, ?zmir, Turkey;2. The Graduate School of Natural and Applied Science, Constr. Materials Program, Buca, ?zmir, Turkey;1. State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan, 430070, China;2. School of Materials Science and Engineering, Wuhan University of Technology, Wuhan, 430070, China |
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| Abstract: | Ultra-High Performance Fiber-Reinforced Concretes (UHP-FRC) subjected to uniaxial tensile loads are investigated in the present paper. The study comprises a new procedure to assess the effectiveness of the hybridization, herein obtained by reinforcing UHP-FRC with micro and macro steel fibers. A comprehensive experimental campaign is also performed on monofiber and hybrid UHP-FRC. In all the concretes, the distance between the cracks and the minimum fiber volume fraction, which produces strain hardening response and multiple cracking, are theoretically and experimentally evaluated. If the bond parameter of the macro-fibers is properly calculated, the results of the analytical model, in terms of crack-spacing vs. fiber volume fraction, are in good agreement with the test data. Moreover, to increase the number of the cracks, and to reduce crack spacing, the hybridization is suitable only when the amount of macro-fibers is within a well-defined range. |
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| Keywords: | Micro-fibers Macro-fibers Monofiber Fiber-volume fraction Analytical modelling Mechanical testing |
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