Characterization and Classification of Mortars for Underlayment with PCR-PET Artificial Aggregate in Partial Replacement of Natural Sand Aggregate in the Mix

This study investigated the feasibility of using Post-Consumer Recycled Polyethylene Terephthalate (PCR-PET) as an alternative aggregate in mortar for civil construction, aiming to evaluate its properties and impact on the sector's sustainability. Compressive strength, substrate adhesion, workability, and water retention tests were conducted on mortars with PCR-PET addition, and the results were compared with conventional mortars and the requirements of the ABNT NBR 13281 standard. The results showed that adding PCR-PET to mortars led to a slight reduction in compressive strength and substrate adhesion; however, the values remained within the limits set by the standard. Workability and water retention of mortars with PCR-PET were similar to conventional mortars. This study contributes to the field of civil construction by presenting PCR-PET as a viable and sustainable alternative for the use of plastic waste in civil construction, contributing to the reduction of demand for natural resources and waste generation. However, further studies are needed to assess the mechanical behavior and durability of mortars with PCR-PET in the long term, as well as their complete environmental impact.