Bending Strength Analysis of Polymer Composite Reinforced With Dried Leaves Filler

Abstract

This study investigates the bending strength of polymer composite materials reinforced with crushed dried leaves as a natural filler, offering a sustainable alternative to synthetic fibres. Eight different composite specimens were fabricated using various combinations of cement, polyester resin, river sand, and dried leaves, with compositions guided by previous research. Specimens were tested according to ASTM C580 using a three-point bending setup to evaluate flexural properties. Results revealed that polyester resin-based composites (ROO and RSO) exhibited the highest flexural strength, with ROO reaching 26.84 MPa and demonstrating significant ductility, while RSO showed superior stiffness (modulus of elasticity: 2367.2 MPa). Composites containing dried leaves (especially RDS) showed moderate strength (14.05MPa) but improved strain (0.0724) characteristics, indicating potential for energy-absorbing applications. Failure modes ranged from brittle fractures to ductile deformations, revealing how different material compositions influence mechanical behaviour. The findings affirm the feasibility of incorporating minimally processed dried leaves in polymer composites for structural and semi-structural applications, promoting environmentally friendly material innovation.