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Determining the Characteristics of Fiber-Reinforced Concrete Using 4D and 5D Fiber: A Study on Different Concrete Grades and Fiber Concentrations
Published in Central Board of Irrigation and Power
Volume: 66r
Issue: 4
Pages: 16 - 26
Steel fiber reinforce-concrete (SFRC) is gaining popularity in the construction industry due to its good post-cracking behavior and numerous benefits for strength and sustainability. SFRC is used for various applications, such as tunnel lining segments, cast-in-lining, and sprayed concrete. Accurately determining and utilizing characteristic values is essential for achieving the best material qualities for structural designs employing fiber reinforced concrete. This article proposes a technique for determining the residual strengths of SFRC for 4D and 5D steel fibers with different concrete grades and fiber fractions. The technique defines characteristic values for FRC and provides a detailed methodology to aid FRC contractors and designers. The experimental residual strengths were taken from experimentally notched beams that underwent three-point bending tests, revealing softening and hardening behaviors in the load-cracking ratio curve of the crack. The concrete matrix consisted of hook-end steel fiber. Concrete, steel, and aluminium together account for 23% of all worldwide emissions. Steel fibers for concrete reinforcement are inherently more sustainable than traditional solutions like rebar and meshes, leading to significant CO2 savings up to 35%. Through advanced steel fiber design optimization, thinner but equally durable concrete slabs can be designed with significantly less concrete, steel, and water than conventional reinforcement solutions. By adding high performance 4D and 5D steel fibers, further design optimization can be achieved. Using steel fibers as a reinforcement solution can significantly reduce the carbon footprint of traditionally reinforced concrete, with steel accounting for nearly 19% of emissions share in 1 cubic metre of concrete. Additionally, using steel fibers reduces the amount of concrete required, further dampening the carbon footprint. Overall, this article provides valuable insights into the benefits and characteristics of SFRC and proposes a technique for determining its residual strengths. This information can aid FRC contractors and designers in achieving the best material qualities for their structural designs while also contributing to a more sustainable construction industry. © 2023, Central Board of Irrigation and Power. All rights reserved.
About the journal
JournalWater and Energy International
PublisherCentral Board of Irrigation and Power