Currently, the widespread issue of waste pollution impacts the environment, particularly due to slowly degrading materials like plastic. Ecuador represents a substantial market for single use plastics in the form of containers, bottles, and bags, highlighting the necessity for effective strategies such as the reutilization of this waste, specifically polyethylene terephthalate (PET). This study aimed to evaluate the application of PET as a substitute for natural aggregate in the production of concrete blocks intended for the wearing course of medium traffic roads, according to INEN standards, these applications require a compressive strength of 40 MPa. The methodology employed was of an experimental practical nature, involving laboratory tests to characterize the materials and apply them in concrete mix design following the American Concrete Institute (ACI) 2011.1 method, three types were performed replacing fine aggregate with plastic particles (2 mm to 4 mm) at 5%, 10%, and 13%.The results indicate that all substitution percentages comply with the specifications required by INEN 1488 and INEN 3040 standards, concrete compressive strengths decreased with increasing substitution percentages compared to conventional paving blocks, the PET incorporated paving blocks met the required strength for use as a wearing course in roads, additionally offering environmental benefits through waste reuse.