Abstract
This paper focuses on the experimental investigation designed to study the behavior of hybrid fiber-reinforced concrete (HFRC) beams under flexure and impact loading. The addition of fibers to concrete can improve a number of its properties. For optimal response, different types of fibers may be suitably combined to produce HFRC. Optimized combinations of different fiber types in concrete can produce a composite with better engineering properties than that with only one type. The study compared the mechanical properties of fresh and hardened HFRC, Steel Fiber Reinforced Concrete (SFRC), and conventional concrete to arrive at the optimum fiber content for improved behavior of concrete by testing 135 specimens. Subsequently, the behavior of steel fiber-reinforced concrete beams was investigated with and without fiber hybridization under flexural and impact loading, followed by a comparison of the results. Fiber hybridization was achieved by developing concrete containing a combination of steel and polypropylene fibers. Eighteen beam specimens of size 1650×200×150 mm were tested in the investigation. Test outcomes demonstrated that the inclusion of fibers in a hybrid form could ensure superior composite performance in terms of flexure and impact resistance when compared to the incorporation of a single type of fibers in reinforced concrete. Doi: 10.28991/CEJ-2022-08-03-010 Full Text: PDF
Highlights
The optimum steel fiber content was between 1% and 1.5% to improve the behavior of Steel Fiber Reinforced Concrete (SFRC) and hybrid fiber-reinforced concrete (HFRC) mixes considered in the study
Increased polypropylene fiber availability in the hybrid fiber system due to its lower density and the ability of polypropylene fibers to bridge micro-cracks leads to an amplification in strength and toughness properties
The addition of hybrid fibers has resulted in a maximum increase of 1.32 times the ultimate load-carrying capacity compared to conventional concrete beams
Summary
Concrete is the most widely used construction material due to its low cost, high strength, water resistance, ease of mouldability, and low maintenance cost. Concrete as a material can be reinforced with short, randomly distributed fibers to cater to its limitations related to brittleness and poor resistance to the propagation of cracks [1–5]. Steel fibers used as secondary reinforcement in concrete beams can significantly improve the mechanical properties of hardened concrete [7]. Superior mechanical properties, such as higher energy absorption and improved blast resistance, make steel fiber-reinforced cementitious composites a prime choice for the development of resilient structures [8]. The addition of more than one fiber type functioning discretely can yield optimum performance by providing a balance between better fresh concrete properties and the toughness of hardened concrete [11]
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