Mechanical Properties of Aramid/Carbon Hybrid Fiber-Reinforced Concrete

Abstract

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.

Quantitative and Qualitative Aspects of Composite Action of Concrete and Dispersion-Reinforcing Fiber

“…[10] steel, basalt polypropylene 1.5 1.25 [14] steel ultrashort ultrafine steel polypropylene 1.92 4.0 0.27 [17] steel 2 [18] Kevlar + carbon 1.0 [19] nylon + jute 1.0 [20] steel, polypropylene 0.25-0.45 [21] PVA steel 1.0-2.0 1.5-4.0 [30] glass, basalt 0.25-2.0 [31] glass 0.5-3.0 [32] glass, polypropylene 0.5-2.0…”

“…The possibility of improving the indicators of durability and operational characteristics of the composite [14][15][16][17][18][19][20][21]. A number of works [18][19][20] considered the mechanical properties of concrete, dispersion-reinforced with various types of fibers.…”

“…The possibility of improving the indicators of durability and operational characteristics of the composite [14][15][16][17][18][19][20][21]. A number of works [18][19][20] considered the mechanical properties of concrete, dispersion-reinforced with various types of fibers. According to the results of studies carried out in [18], it was found that concrete reinforcement with a combination of aramid and carbon fibers has a significant effect on the mechanical strength of reinforced concrete.…”

“…A number of works [18][19][20] considered the mechanical properties of concrete, dispersion-reinforced with various types of fibers. According to the results of studies carried out in [18], it was found that concrete reinforcement with a combination of aramid and carbon fibers has a significant effect on the mechanical strength of reinforced concrete. In general, the mechanical strength of concrete reinforced with a combination of aramid and carbon fibers was better than that of concrete with only Kevlar or carbon fibers.…”

An Experimental Study of the Mechanical Properties of Partially Rehabilitated Cable Tunnels

“…Cobos [ 9 ] studied the influence of crystalline admixtures at early age performance of cement-based mortar by electrical resistance monitoring, and Fayed [ 10 ] proposed an innovative method for sustainable utilization of blast-furnace slag in the cleaner production of one-part hybrid cement mortar. On the other hand, many researchers have studied the high-performance cement mortar materials: Li [ 11 ] studied the mechanical properties of aramid/carbon hybrid fiber-reinforced concrete; Haroon [ 12 ] studied the performance of reinforced concrete beams strengthened with carbon fiber reinforced polymer strips; and Shi [ 13 ] studied the effect of desert sand on the pore structure of fiber reinforced mortar. As for polymer materials, most research has focused on the polymer materials modified with fibers and inorganic materials: Li [ 14 ] studied the anisotropic mechanical response and strain localization of a metallic glassy-fiber-reinforced polyethylene terephthalate fabric; Lionetto [ 15 ] studied carbon fiber reinforced polymers; Park [ 16 ] studied a microwave composite forming process based on a sic mold for manufacturing fiber metal laminate; and Lou [ 17 ] investigated the fatigue performance of an asphalt mixture reinforced by basalt fiber.…”