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PET (polyethylene terephthalate) is a suitable final destination material, as it takes around 100 years for its decomposition and irregular disposal in a given state of great harm to society. Despite the large amount of recycled material, only 50% of the material produced has this destination. In order to reduce the amount of polymers in nature, this work aims at the mechanical behavior of a bentonite mixed with PET micronized. The study showed the use of crushed PET around 1 mm in different contents (5% and 10%), making possible the application of strength parameters, making possible the conservation of waste in geotechnical works. The development of the study was characterized as a mechanism of physical and mechanical characterization, such as direct shear tests. The shear tests were performed with the confining stress of 50kPa, 100kPa and 150kPa, without reading the neutral pressure. With the results obtained from the direct shear tests, it can be seen that the mixture in PET is 5% with crushed PET (B95FCPET5), being more favorable the use in geotechnical works, having a relation in the strength parameters. The cohesive intercept of peak and residual increased residuals of 6kPa for 10kPa and 1kPa for 5kPa, respectively. The friction angle of peak and residual resistors reduction from 5o to 4o and 4o to 3o, respectively. Despite the possibility of substitution of the GCL for the mixture, however, it can be applied in other types of geotechnical works.