Abstract
This study developed a macro-sized polyamide (PA) fiber for concrete reinforcement and investigated the influence of the PA fiber on flexural responses in accordance with ASTM standards. PA fibers are advantageous compared to steel fibers that are corrosive and gravitated. The macro-sized PA fiber significantly improved concrete ductility and toughness. Unlike steel fibers, the PA fibers produced two peak bending strengths. The first-peaks occurred near 0.005 mm of deflection and decreased up to 0.5 mm of deflection. Then the bending strength increased up to second-peaks until the deflections reached between 1.0 and 1.5 mm. The averaged flexural responses revealed that PA fiber content did not significantly influence flexural responses before L/600, but had significant influence thereafter. Toughness performance levels were also determined, and the results indicated more than Level II at L/600 and Level IV at others.
Highlights
Distributed short fiber reinforcements are used to improve the brittle characteristics of concrete
The objective of this study is to provide the PA fiber processing technique and to report the physical and mechanical properties of PA fiber reinforced concrete (PAFRC) in terms of compressive and flexural responses in accordance with
Contrary to other organic reinforcing fibers and steel fibers, the macro-size PA fiber broke without separating from the cement matrix
Summary
Distributed short fiber reinforcements are used to improve the brittle characteristics of concrete. The fibers hold together the cracks and reduce potential problems such as water permeating causing steel corrosion and deterioration. The resulting fiber reinforced concrete (FRC) exhibits superior performance compared to plain concrete due to its high tensile strength and ductile tensile behavior. Steel fiber reinforced concrete has both high tensile strength and bending strength and controls cracks. Gravitation and corrosion of the steel fiber may occur, and rebounding during tunnel shotcrete application due to low adhesion characteristics causes lower than expected strength and higher costs [16]. Organic fiber usually has lower elastic modulus and tensile strength compared to steel fiber and is tangled, causing low workability. For practical use in reinforced concrete, organic fiber requires improved mechanical characteristics and workability
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