Evaluation of eco-friendly concrete having waste PET as fine aggregates

This study assesses the impacts of recycling waste polyethylene terephthalate (PET) plastic bottles as a partial substitute for fine natural aggregates on workability, mechanical, microstructural, economic, and thermal properties concrete. The mix design adopts concrete ratio 1:2:4 grade M25, 0.55 water/cement ratio, ordinary Portland cement (OPC) binder, varying proportions heat-processed PET river sand aggregates, granite coarse aggregate. Results indicate that workability increased with increasing percentages plastics until 40%PET level, beyond which reduces. Compressive split tensile strength decreased plastics. However, 10% to 40%-PET-modified mixes achieved recommended M20 Microstructural analysis 30%PET indicates higher quantities O Ca, trivial Mg, Si, C, Al, Au. Whereas 100%PET presence only O, endures three transition stages during heat flow. A glass transition, an exothermic peak below decomposition temperature cooling at 199.88 °C from crystallization, baseline shift after endothermic 243.22°C. Thermogravimetry revealed suffers dual-stage decomposition, initial stage accounting 87.41% reduction in sample mass second further loss 12.79%. Highly significant statistical correlations regressions developed variations between PET% mechanical parameters. shows PET-modified is appropriate structural applications due its suitable fresh, properties. Besides, this practice eco-friendly sustainable it conserves resources.