Effect of macro synthetic fiber (MSF) on the behavior of conventional concrete and the concrete containing e-waste aggregates

The appropriate disposal of plastic waste remains a persistent challenge for scientists and researchers. Several methods have been developed for managing plastic waste, including its use in concrete production. However, utilizing electronic waste (e-waste) materials in concrete presents challenges, particularly in reducing concrete strength. To address this, the current research incorporates macro synthetic fibers (MSF) into both conventional concrete and concrete containing e-waste aggregates. In this study, shredded e-waste coarse aggregates (ECA) partially replace 30% of natural coarse aggregates (NCA) by volume. Various properties of both conventional and ECA-modified concrete are evaluated, including mechanical characteristics, durability performance, and microstructural developments. One-way analysis of variance (ANOVA) is also performed to determine the significance of the mechanical and durability properties of mixes having MSF. The results show that concrete with MSF significantly outperforms concrete without it. Specifically, incorporating 0.75% MSF (by volume) enhances splitting tensile strength by 152%, flexural strength by 98%, and compressive strength by 38%. However, an inverse relationship is observed between MSF dosage and the permeability-based durability of fiber-reinforced concrete. Scanning electron microscopy (SEM) reveals that adding ECA weakens the internal concrete matrix, but optimal MSF inclusion improves the microstructure. This study highlights the importance of incorporating e-waste materials into concrete and demonstrates that appropriate fiber reinforcement (MSF) is crucial for addressing strength challenges while promoting sustainability and practicality.