AN INVESTIGATION INTO FIBER REINFORCED CONCRETE USING POLYETHYLENE MATERIALS

This study investigates the mechanical and durability performance of fiber-reinforced concrete incorporating polyethylene (PE) materials as a sustainable alternative to conventional steel reinforcement. Waste-derived polyethylene fibers, mainly from sachet water bags and shopping bags, were processed and incorporated into concrete mixes at varying proportions of 0%, 0.5%, 1.0%, and 1.5% by weight of cement. Standard laboratory tests were conducted in accordance with relevant British Standards (BS EN 1097, 196, 812, and 12390) to evaluate the physical properties of constituent materials, workability, and compressive strength at 7, 14, 21, and 28 days of curing. Preliminary tests confirmed that the aggregates used were of good quality, with specific gravity values of 2.71 and 2.75 for fine and coarse aggregates respectively, and moisture contents between 13.62% and 16.14%. The sieve analysis results indicated well-graded aggregates suitable for dense and durable concrete. Slump tests showed a reduction in workability as fiber content increased due to interlocking and higher surface area, although all mixes remained workable for proper compaction. Compressive strength results revealed that the control mix achieved a maximum strength of 9.96 N/mm² at 28 days, while the addition of polyethylene fibers improved crack resistance, ductility, and toughness. Optimum performance was achieved at 0.5–1.0% fiber content, beyond which workability and uniformity declined. The study concludes that polyethylene fibers can be effectively utilized as secondary reinforcement in concrete to enhance toughness and durability while promoting sustainable waste management and eco-friendly construction practices.