Performance Evaluation of Natural and Synthetic Fibre Reinforced Concrete Using Coconut and Glass Fibres

The increasing demand for sustainable and high-performance construction materials has led to the exploration of fibre reinforced concrete using both natural and synthetic fibres. This study presents a comprehensive performance evaluation of concrete reinforced with Coconut Fibre (CF) and Glass Fibre (GF). Concrete mixes of grades M15, M20, and M25 were prepared with varying fibre contents of 5%, 10%, and 15% to investigate their influence on mechanical and durability properties. Experimental investigations were carried out to determine compressive strength and water absorption characteristics at different curing periods. The results indicate that the incorporation of fibres significantly enhances the performance of concrete compared to conventional mixes. Glass Fibre reinforced concrete demonstrated superior compressive strength and reduced water absorption due to its high tensile strength and better bonding with the cement matrix. In contrast, Coconut Fibre contributed to improved ductility and crack resistance, although higher fibre content led to increased water absorption due to its porous nature. An optimum fibre content of 10% was observed to provide the best balance between strength, durability, and workability for both fibre types. Beyond this level, a reduction in performance was noted due to fibre agglomeration and decreased workability. Additionally, higher grade concrete (M25) showed better compatibility with fibre reinforcement, yielding more consistent improvements. The study concludes that Glass Fibre is more suitable for structural applications requiring higher strength and durability, while Coconut Fibre offers an eco-friendly and cost-effective alternative for sustainable construction. The findings highlight the potential of combining natural and synthetic fibres to develop advanced concrete materials with enhanced performance characteristics.