The project provides information on the physical and mechanical properties of clay soils stabilized with recycled polymers (PET) as subgrade improvement in rural roads in the district of Sicaya, because this area does not have paved roads nearby which cause inaccessibility to the population; also by using PET for soil improvement, an added value was given to this material generating a lower environmental impact. In order to fulfill the objective of the research, the physical properties of two soil specimens from Jr. La Libertad in the district of Sicaya were determined; sieving tests of granulometry, consistency limits, modified proctor and soil classification by SUCS and AASHTO were performed. Once the soil properties were evaluated, the optimum size of the PET particles for its application was determined by CBR tests using 1% of PET as a proof. It was found that the optimum size was fr...