A comprehensive review: The impact of recycling polypropylene fiber on lightweight concrete performance

Abstract In the pursuit of sustainable and durable building materials, this study delves into the potential application of polypropylene fiber (PPF) as a reinforcement material in lightweight concrete. With increasing emphasis on environmentally responsible construction, enhancing the mechanical performance of lightweight concrete is crucial. Although PPF is not a cementitious material, its integration into concrete mixtures has shown promise in improving properties such as compressive strength, flexural strength, and ductility. A detailed analysis of the chemical and physical characteristics of various PPF types was conducted to assess their influence on concrete behavior. In addition, a comprehensive literature review was undertaken to identify existing gaps and establish a foundation for further investigation. The study also evaluates the effects of PPF inclusion on failure modes, stress–strain behavior, and crack propagation in lightweight concrete. Results indicate that incorporating PPF significantly enhances toughness, crack resistance, and energy absorption capacity, contributing to a more ductile and resilient material. These improvements are particularly relevant for structural applications requiring both reduced weight and enhanced durability. However, the performance gains are closely related to the fiber type, dosage, and distribution, underscoring the need for careful mix design and optimization. By addressing limitations in previous studies and offering a nuanced understanding of PPF’s role in lightweight concrete, this research contributes valuable insights for the development of durable, sustainable building materials. The findings serve as a foundation for future research and practical applications, supporting the broader adoption of fiber-reinforced concrete in environmentally conscious construction.