A Study on the Mechanical Properties of the Hybrid Fiber-Reinforced Mortar Using the Macro Steel and Micro Carbon Fibers
American Journal of Civil Engineering
Volume 8, Issue 6, November 2020, Pages: 128-138
Received: Oct. 29, 2020;
Accepted: Nov. 12, 2020;
Published: Nov. 19, 2020
Views 21 Downloads 19
Gwang Hee Heo, Department of International Civil and Plant Engineering, Konyang University, Nonsan, Republic of Korea
Jong Gun Park, Public Safety Research Center (PSRC), Konyang University, Nonsan, Republic of Korea
Hyung Min Jun, Department of Disaster and Safety Engineering, Konyang University, Nonsan, Republic of Korea
Dong Ju Seo, Moowang Construction, Iksan, Republic of Korea
Sung Gon Koh, Department of Cadastre & Civil Engineering, Jeonju Vision College, Jeonju, Republic of Korea
In the present study, an experiment was conducted to investigate the mechanical properties such as fluidity, compressive strength and flexural performance (flexural strength and toughness) of a single fiber-reinforced mortar (FRM) using only macro steel fiber (SF) or micro carbon fiber (CF) with different material properties and SF-CF hybrid FRM using a mixture of macro SF and micro CF. The specimens incorporated macro SF and micro CF in the mix proportions of 100-0%, 75-25%, 50-50%, 25-75% and 0-100% by volume at a total fiber volume fraction of 1.0%. Their mechanical properties were further compared and reviewed with the plain mortar at 28 days of age. The experimental results of fresh mortar showed that the table flow of mortar using only macro SF was slightly reduced compared to plain mortar, whereas the table flow of mortar using only micro CF and SF-CF hybrid mortar decreased significantly with increase of micro CF. It was revealed from the test of the hardened mortar that the SF-CF=75-25% (M3) specimen showed the highest compressive and flexural strength, and the SF-CF=50-50% (M6) specimen obtained the highest flexural toughness. Therefore, it was possible to confirm the synergistic reinforcement effect of that enhanced the strength and improved the flexural performance by hybrid of macro SF and micro CF. Based on the results of this experiment, the optimal mix proportion of SF-CF hybrid FRM is proposed in this paper to improve the compressive strength, flexural strength and flexural toughness.
Gwang Hee Heo,
Jong Gun Park,
Hyung Min Jun,
Dong Ju Seo,
Sung Gon Koh,
A Study on the Mechanical Properties of the Hybrid Fiber-Reinforced Mortar Using the Macro Steel and Micro Carbon Fibers, American Journal of Civil Engineering.
Vol. 8, No. 6,
2020, pp. 128-138.
Cao, M, Mao, Y, Khan, M, Si, W, Shen, S. (2018), “Different testing methods for assessing the synthetic fiber distribution in cement-based composites,” Construction and Building Materials, 184, 128–142.
Heo, G. H, Park, J. G, Kim, C. G. (2020), “Evaluating the resistance performance of the VAEPC and the PAFRC composites against a low-velocity impact in varying temperature,” Advances in Civil Engineering, Volume 2020, https://doi.org/10.1155/2020/7901512.
Yi, D. R, Ha, G. J. (2014), “Improvement of structural performance of RC beams retrofitted hybrid fiber using recycles coarse aggregate and ground granulated blast furnace slag,” Journal of the Korea Institute for Structural Maintenance and Inspection, 18 (6), 1-10.
ACI Committee 544. (1999), “Measurement of properties of fiber reinforced concrete,” American Concrete Institute.
Heo, G. H, Park, J. G, Song, K. C, Park, J. H, Jun, H. M. (2020), “Improving the interfacial bond properties of the carbon fiber coated with a Nano-SiO2 particle in a cement paste matrix,” Advances in Civil Engineering, Volume 2020, https://doi.org/10.1155/2020/8838179.
Naaman, A. E. (2002), “Toughness, ductility, surface energy and deflection-hardening FRC composites, proceedings of the JCI international workshop on ductile fiber-reinforced cementitious composites (DFRCC),” Application and Evaluation (DFRCC-2002), JCI, 33-57.
Brandt. A. M. (2008), “Fibre reinforced cement-based (FRC) composites after over 40 years of development in building and civil engineering,” Composites Structures, 86, 3-9.
Zhang, P, Li, Q. F. (2013), “Effect of polypropylene fiber on durability of concrete composite containing fly ash and silica fume,” Composites: Part B, 45, 1587-1594.
Kim, H. J, Kim, N. W. (2020), “Enhancement of mechanical property of concrete structure using the macro and micro steel fibers,” American Journal of Civil Engineering, 2020: 8 (1), 1-9.
Banthia N, Sappakittipakorn M. (2007), “Toughness enhancement in steel fibre reinforced concrete through fiber hybridization,” Cement and Concrete Research, 37, 1366-1372.
Cao, M, Xie, C, Guan, J. (2019), “Fracture behavior of cement mortar reinforced by hybrid composite fiber consisting of CaCO3 whiskers and PVA-steel hybrid fibers,” Composites Part A, 120, 172-187.
Lawler, J. S. Wilhelm, T. Zampini, D, Shap, S. P. (2003), “Fracture processes of hybrid fiber-reinforced mortar,” Materials and Structures, 36, 197-208.
Pakravan, H. R, Latifi, M, Jamshidi, M. (2017), “Hybrid short fiber reinforced system in concrete: A review,” Construction and Building materials, 142, 280-294.
Kim, S, Yoo, D. Y. (2018), “Hybrid effects of steel fiber and carbon nanotube on self-sensing capability of ultra-high-performance concrete,” Constr. Build. Mater, 185, 530-544.
Park, M. S, Shin, S. Y, Jeong, E. C, Kim, Y. S. (2016), “A study on mechanical property of high strength mortar reinforced with hybrid fibers,” Journal of the Architectural Institute of Korea Structures & Construction, 32 (7), 49-56.
Yao, Y, Li. J, Wu. K. (2003), “Mechanical properties of hybrid fiber-reinforced concrete at low fiber volume fraction,” Cement and Concrete Research, 33, 27-30.
KS L 5105. (2007), “Test method for compressive of hydraulic cement mortar,” Korea Agency for Technology and Standards, 1-5.
KS L ISO 679. (2016), “Methods of testing cements-determination of strength,” Korea Agency for Technology and Standards, 1-16.
ASTM C 1609/C 1609 M. (2010), “Standard test method for flexural performance of fiber-reinforced concrete (using beam with third-point loading), “ASTM Standards, United States.
KS F 2566. (2014), “Standard test method for flexural performance of fiber reinforced concrete,” Korea Agency for Technology and Standards, 1-10.
Dehghani, A, Aslani, F. (2020), “The effects of shape memory alloy, steel, and carbon fibers on fresh, mechanical, and electrical properties of cementitious composites,” Cement and Concrete Composites, http://doi:10.1016/J.cemconcomp.2020.103659.
Heo, G. H, Park, J. G, Song, K. C, Park, J. H, Jun, H. M. (2020), “Mechanical properties of SiO2-coated carbon fiber-reinforced mortar composites with different fiber lengths and fiber volume fractions,” Advances in Civil Engineering, Volume 2020, https://doi.org/10.1155/2020/8881273.
Park, M. S, Shin, S. Y, Jeong, E. C, Kim, Y. S. (2016), “A study on the mechanical property of high strength mortar reinforced with hybrid fibers,” Journal of the Architectural Institute of Korea Structure & Construction, 32 (7), 49-56.
Singh, S. P, Singh, A. P, Bajaj V. (2010), “Strength and flexural toughness of concrete reinforced with steel-polypropylene hybrid fibers,” Asian Journal of Engineering (Building and housing), 11 (4), 495-507.