Polyethylene terephthalate fiber reinforcement for enhanced concrete mechanical and durability performance: A review

-This review combines and summarizes the research on the performance of polyethylene terephthalate fiber (PETF) in concrete. The review first discusses the general background of concrete and related environmental and disposal issues of plastic waste. Secondly, the review discusses properties of PETF, its impact on concrete properties such as mechanical performance, failure pattern, durability aspects, and microstructure analysis. The findings indicate that PETF decreases the concrete slump, but the concrete is still workable. A significant improvement in strength was noted, particularly flexural and tensile strength, as compared to compressive strength. Also, an improvement in the concrete ductility was noted. Furthermore, it also decreases the undesirable sudden failure of concrete. Durability aspects were improved, but the information related to long-term durability is limited, and a more detailed study is required to ensure practical application. The review also points out that longer fibers (50 mm) and deformed shapes are more effective than shorter (30 mm) straight fibers. Microstructure indicates that PETF improves the internal structure of concrete due to crack prevention. The reviews conclude that PETF has the potential to be used as a fiber reinforcing, but variations in results cause confusion, which may be due to variations in physical properties or concrete mix design. Therefore, the review recommends further research to identify the exact parameters of PETF that cause variation.