Mechanical Properties of Aramid/Carbon Hybrid Fiber-Reinforced Concrete
Yeou-Fong Li,
Hsin-Fu Wang,
Jin-Yuan Syu,
Gobinathan Kadagathur Ramanathan,
Ying-Kuan Tsai,
Man Hoi Lok
Affiliations
Yeou-Fong Li
Department of Civil Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
Hsin-Fu Wang
Department of Civil Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
Jin-Yuan Syu
Department of Civil Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
Gobinathan Kadagathur Ramanathan
Department of Civil Engineering, National Taipei University of Technology, Taipei 10608, Taiwan
Ying-Kuan Tsai
Department of Environmental Information and Engineering, Chung Cheng Institute of Technology, National Defense University, P.O. Box 90047-82, Dasi, Taoyuan 33550, Taiwan
Man Hoi Lok
Department of Civil and Environmental Engineering, Faculty of Science and Technology, University of Macau, Taipa, Macau, China
In this study, aramid fiber (Kevlar® 29 fiber) and carbon fiber were added into concrete in a hybrid manner to enhance the static and impact mechanical properties. The coupling agent presence on the surface of carbon fibers was spotted in Scanning Electron Microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) graphs. The carbon fiber with a coupling agent affected the mechanical strength of the reinforced concrete. At 1% fiber/cement weight percentage, the hybrid fiber-reinforced concrete (HFRC) prepared using Kevlar fiber and carbon fiber of 12 and 24 mm in length under different mix proportions was investigated to determine the maximum mechanical strengths. From the test results, the mechanical strength of the HFRC attained better performance than that of the concrete with only Kevlar or carbon fibers. Foremost, the mix proportion of Kevlar/carbon fiber (50–50%) significantly improved the compressive, flexural, and splitting tensile strengths. Under different impact energies, the impact resistance of the HFRC specimen was much higher than that of the benchmark specimen, and the damage of the HFRC specimens was examined with an optical microscope to identify slippage or rupture failure of the fiber in concrete.
