When fibre-reinforced concrete (FRC) is discussed, it’s often reduced to a simple statement: “Fibres help control cracks.” While true, this description barely scratches the surface of how fibres influence the structural behaviour of Unlike conventional reinforcing bars, which carry tensile forces after cracking, fibres are distributed throughout the concrete matrix. As microcracks begin to form, these fibres bridge the crack faces, slowing crack growth and allowing the concrete to continue carrying tensile stresses beyond its initial cracking point. This phenomenon significantly improves the material’s toughness and post-cracking behaviour , two properties that conventional concrete lacks. One of the most noticeable benefits appears in the Serviceability Limit State (SLS) . Fibre reinforcement generally produces many fine cracks instead of a few wide ones. Narrower crack widths improve durability by reducing the ingress of water and chlorides, ultimately enhancing the long-term...
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