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Concrete is the most widely used construction material due to its versatility and ability to be molded into various shapes. However, it inherently exhibits little tensile strength, limited ductileness, and poor crack resistance, often leading to brittle failure. To address these limitations, modern construction increasingly incorporates fibers into concrete to enhance its mechanical properties, durability, and overall performance. Among various fiber types, steel fibers have demonstrated superior crack resistance and improved structural behavior. This study focuses on evaluating the flexural strength behavior of Steel Fiber Reinforced Concrete (SFRC) using M30 grade concrete. An experimental program was conducted involving the casting of 180 prisms (100 × 100 × 500 mm) and 360 cubes (100 × 100 × 100 mm) with steel fiber contents of 1%, 1.5%, and 2% and aspect ratios of 50, 60, and 70. The fiber used had a diameter of 1 mm. The experimental program was limited to evaluating the mechanical performance of the concrete using compressive strength, flexural strength, and splitting tensile strength tests. Special tamping. micromechanical analysis and different workability methods have been omitted. The results reveal that incorporating steel fibers significantly enhances the mechanical properties of concrete. Notably, a mix containing 1.5% steel fibers with an aspect ratio of 70 exhibited the highest strength improvements across all tests, including an 18% increase in compressive strength, a 35% increase in split tensile strength, and a 36% increase in flexural strength compared to control specimens. These findings demonstrate that optimized steel fiber reinforcement not only improves flexural behavior but also contributes to superior structural integrity, making SFRC a promising material for high-performance construction applications.

The study demonstrates that incorporating steel fibers significantly enhances the compressive, tensile, and flexural strength of concrete.5% steel fiber content and an aspect ratio of 70 exhibited the most substantial improvements in all strength parameters.These findings confirm the effectiveness of steel fiber reinforcement in improving concrete performance and suggest its potential for high-performance construction applications.

Future research should investigate the long-term durability of SFRC under various environmental conditions, including exposure to chlorides and freeze-thaw cycles, to assess its suitability for diverse structural applications. Furthermore, exploring the optimal combination of steel fiber parameters – diameter, volume fraction, and aspect ratio – alongside different concrete mix designs is crucial to maximize performance and minimize cost. Finally, a comprehensive investigation into the workability of SFRC mixtures, potentially incorporating advanced admixtures or mixing techniques, is needed to address the challenges associated with fiber dispersion and ensure ease of construction, particularly for large-scale projects. These studies will contribute to a more complete understanding of SFRC behavior and facilitate its wider adoption in sustainable and resilient infrastructure development.

  1. A820/A820M Standard Specification for Steel Fibers for Fiber-Reinforced Concrete. a820 a820m standard... astm.org/cgi-bin/resolver.cgi?A820A820M-22A820 A820M Standard Specification for Steel Fibers for Fiber Reinforced Concrete a820 a820m standard astm cgi bin resolver cgi A820A820M 22
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