Highly dispersed graphene oxide electrodeposited carbon fiber reinforced cement-based materials with enhanced mechanical properties |
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| Affiliation: | 1. Institute of Applied Physics and Materials Engineering, University of Macau, Macau, China;2. Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China;3. Department of Civil Engineering, Mirpur University of Science and Technology, Allama Iqbal Road Mirpur AJK 10250, Pakistan;1. Department of Civil Engineering, Monash University, Clayton, VIC 3800, Australia;2. Centre for Built Infrastructure Research, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia;3. Centre for Sustainable Infrastructure, Faculty of Science Engineering & Technology, Swinburne University of Technology, Hawthorn, VIC 3122, Australia;1. Department of Applied Science and Technology, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129, Torino, Italy;2. National Interuniversity Consortium of Materials Science and Technology (INSTM), Florence, Italy;3. Massachusetts Institute of Technology, 77 Massachusetts Ave, 02139, Cambridge, MA, USA;4. Department of Structural, Geotechnical and Building Engineering, Politecnico di Torino, C.so Duca degli Abruzzi 24, 10129, Torino, Italy;1. School of Materials Science and Engineering, Chang’an University, Xi’an 710061, PR China;2. Engineering Research Central of Pavement Materials, Ministry of Education of PR China, Chang’an University, Xi’an 710061, PR China;3. School of Highway Engineering, Chang’an University, Xi’an 710064, PR China;1. Joint Key Laboratory of the Ministry of Education, Institute of Applied Physics and Materials Engineering, University of Macau, Avenida da Universidade, Taipa, Macau SAR, China;2. Department of Civil Engineering, Qingdao Technological University, Qingdao, 266033, China;3. Department of Civil Engineering, Mirpur University of Science and Technology, Allama Iqbal Road, Mirpur, AJK, 10250, Pakistan;4. XJTU-Oxford International Joint Laboratory for Catalysis, School of Chemical Engineering and Technology, Xi''an Jiaotong University, Xi''an, 710049, China;1. Army Engineering University, Shijiazhuang 050003, China;2. Hebei Jiaotong Vocational and Technical College, Shijiazhuang 050003, China |
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| Abstract: | Mechanical behavior of carbon fiber (CF) reinforced cement-based materials greatly depends on the dispersion of CF and interfacial properties between the CF and cement matrix. In this study, graphene oxide (GO) was utilized to modify the surface properties of CF, including the roughness, wettability and chemical reactivity, and the graphene oxide/carbon fiber (GO/CF) hybrid fibers were fabricated by a newly designed electrophoretic depositing method. The scanning electron microscopy and contact angle measurement results indicated that GO/CF hybrid fibers not only had a rougher surface which was expected to improve the physical friction when CF was pulled out from cement matrix, but also had a higher wettability surface that made it easier to contact with cement hydrates as nucleation sites. In addition, GO/CF hybrid fibers were capable of high chemical reactivity due to the introduction of GO with many functional groups, which ensured them more likely to interact with cement hydrates due to the hydrogen bonding at interface and therefore benefited to strengthen the bonding between the CF and cement matrix. In terms of mechanical behavior, three-point bending test showed that compared with the CF reinforced cement paste, flexural strength of the GO/CF hybrid fibers reinforced cement paste was enhanced by 14.58%, and could be further improved by 10.53% when the GO/CF hybrid fibers were pre-dispersed in the GO solution and then mixed with cement powders. The larger electrostatic repulsion and steric stabilization led to the better dispersion of GO/CF hybrid fibers in GO solution, which were responsible for the further mechanical enhancement of cement paste. In conclusion, the research outcomes provided a novel way for utilizing GO as both of dispersant and surface modifier to improve the dispersion of CF in cement and strengthen its bonding with cement hydrates, consequently achieving a significant enhancement in the mechanical properties of cement paste. |
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| Keywords: | Graphene oxide Carbon fiber Electrophoretic depositing method Mechanical properties Cement paste |
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