Enhancing strength properties of fiber-reinforced concrete using graded alkali-resistant glass fibers

The shortcomings of traditional fibers are addressed by alkali-resistant glass fibers, which provide a revolutionary alternative for concrete reinforcement by increasing durability and resistance to alkaline conditions. The influence of graded alkali-resistant glass fibers on the mechanical characteristics of M30-grade concrete is examined in this research. A control (M1, 0% fiber) and four fiber-reinforced mixes (M2; 1.2% fiber of 3 mm length), M3; 1.2% fiber of 6 mm length), M4; 1.2% fiber of 12 mm length), and M5 (0.4% of 3 mm, 6 mm, and 12 mm fibers) were among the five mixes that were tested. The water-to-cement ratio remained at 0.42 by all mixes. FESEM, XRD analysis, slump tests, compressive strength, split tensile strength, and flexural strength were among the performance measures. According to the results, graded fibers (M5) performed better mechanically than single-length fibers, particularly in split tensile and flexural strength. After 28 days of curing, fiber-reinforced concrete showed significant gains over the control: a 5.44% increase in compressive strength, a 22.64% rise in split tensile strength, and a 27.10% increase in flexural strength. These improvements were mostly attributable to graded fibers’ improved orientation and dispersion, underscoring their promise for robust infrastructure. This research demonstrates that graded alkali-resistant glass fibers are a practical way to increase the strength and durability of concrete, providing long-term opportunities for strong structural applications. To further improve this potential reinforcement strategy, future studies should examine cost-effectiveness, fiber combinations, and long-term durability.