Improving the properties of recycled Polyethylene terephthalate (PET) reinforced with different fibers

Abstract The accumulation of plastic waste, especially polyethylene terephthalate (PET), is a major environmental concern. This research focuses on the use of recycled polyethylene terephthalate (r-PET) as a building material in concrete, and studies the improvement of its properties by reinforcing it with natural and synthetic fibers. The effect of adding hemp fibers on the mechanical and physical properties of PET composites was investigated. Results after curing each sample for 7, 14, and 28 days showed that reinforcing r-PET with fibers significantly increased compressive strength, flexural strength, and density, making it a suitable option as a complement or partial replacement for conventional concrete. Furthermore, the use of hemp fibers, as a renewable and biodegradable resource, enhances the sustainability of the resulting materials. It contributes to the production of high-performance, environmentally friendly building materials, reduces plastic waste, supports the economy, and can be applied in semi-structural concrete to promote sustainable construction techniques.