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This study explores the use of waste rubber powder and polyethylene terephthalate (PET) powder as substitutes at elevated levels in High-Performance Concrete (HPC) aggregates to promote more a sustainable solution for concrete production. Comprehensive assessments were conducted, including compressive, tensile, and bending strength evaluations, water absorption tests, impact resistance, modal analysis, Scanning Electron Microscopy (SEM), and life cycle cost (LCC) analysis. The findings highlight the effects of incorporating waste rubber powder and PET at a volume ratio of 40%. While this ratio contributes positively to certain mechanical attributes, it is important to note that higher substitution levels can lead to a decline in overall compressive strength. This illustrates the need for a balanced approach to mixing proportions. The modal analysis revealed that increasing the proportion of tire or PET powder reduces the natural frequency of the material due to decreased stiffness. However, the damping ratio improves, indicating enhanced energy dissipation capabilities. The impact resistance tests demonstrated that samples with 50% rubber powder exhibited the highest energy absorption. LCC results demonstrated that low substitution levels (10–20%) provide a favorable balance between mechanical performance and economic efficiency.
Mostafaei et al. (Mon,) studied this question.