Split Tensile Behavior of Recycled Steel Fiber-Reinforced Concrete

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Title: Split Tensile Behavior of Recycled Steel Fiber-Reinforced Concrete

Author(s): T. Asheghi Mehmandari, M. Shokouhian, M. Imani, K. F. Tee, and A. Fahimifar

Publication: Materials Journal

Volume: 122

Issue: 2

Appears on pages(s): 15-28

Keywords: digital image correlation (DIC); fiber interface transition zone (FITZ); recycled steel fibers (RSFs); scanning electron microscopy (SEM); split tensile behavior; sustainable fiber-reinforced concrete (FRC)

DOI: 10.14359/51744375

Date: 3/1/2025

Abstract:
This study investigates the behavior of recycled steel fibers (RSFs) recovered from waste tires and industrial hooked-end steel fibers (ISF) in two single and hybrid reinforcement types with different volume content, incorporating microstructural and macrostructural analyses. Scanning electron microscopy (SEM) is used to study the microstructure and fractures, focusing on crack initiation in the fiber interface transition zone (FITZ). The macrostructural analysis involves using digital image correlation (DIC) software, Ncorr, to analyze the split tensile behavior of plain and fiber reinforced concrete (FRC) specimens, calculating strain distribution and investigating crack initiation and propagation. The SEM study reveals that, due to the presence of hooked ends, industrial fibers promoted improved mechanical interlocking; created anchors within the matrix; added frictional resistance during crack propagation; significantly improved load transfer; and had better bonding, crack bridging, and crack deflection than recycled fibers. RSFs significantly delay crack initiation and enhance strength in the pre-peak zone. The study suggests hybridizing recycled fibers from automobile tires with industrial fibers as an optimum strategy for improving tensile performance and using environmentally friendly materials in FRC.

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