Aplicação da MEV na investigação da distribuição de partículas de PET micronizado em argamassa para revestimento e assentamento.

Abstract

The waste disposal and reuse processes are strong points in the discussions and studies related to the conservation of the environment since the man realized this need. At the same time, studies are focused on the discovery of new raw materials and technologies for the most diverse segments of activities in order to avoid the scarcity of various products. Polyethylene terephthalate (PET) is a thermoplastic widely used for the manufacture of packaging, namely carbonated beverage bottles, having low density, transparency, brightness, good performance in different designs, Safety and ease of molding, as well as providing high mechanical and chemical resistance. Its use generates a large volume of improperly disposed waste in the environment, which generates serious environmental impacts. Thus, the objective of this project is to evaluate the miscrotructure of mortar incorporated with micronized PET in partial substitution to the small aggregate in the contents 20% e 30%. The specimens were molded in 5 cm x 10 cm dimensions and the physical, mechanical and microstructure properties of mortars at 7, 14 and 28 days were evaluated. Compared with reference mortars, an increase in water absorption and void index was found. The simple compression tests indicated that the mortar strength decreases as the percentage of PET incorporation increases, and, for both levels, the results were lower than those of the reference samples. The SEM investigation identified that the mortars incorporated with PET have an irregular and heterogeneous matrix, with voids in the structure.