Concrete blocks with PET Waste: Alternative to Urban Sustainability

Abstract

Research that focuses on incorporating recyclable materials in the production of construction elements and components is important to reduce the consumption of non-renewable natural resources. The objective is to demonstrate the technical feasibility of producing a dry concrete mixture with the incorporation of polyethylene terephthalate (PET) residues for the manufacture of simple hollow concrete blocks. The following methodological steps were taken: dosage study, made specimens with dry concrete replacing the sand with PET residue in the percentages of 0, 5, 10, and 15%; evaluation of the physical and mechanical properties of the specimens; production of reference blocks and with sand replacement by PET flakes; and, evaluation of the blocks physical and mechanical properties. The progressive introduction of PET in the cementitious matrix of the concrete increased the water absorption and voids index in the surveyed traces, as well as reduced the specific mass and compression resistance. The blocks attended the dimensional and physical requirements. To meet the minimum resistance, the percentage of incorporation of PET in the block must be reduced to 7%. It is demonstrated that PET recycling is technically feasible for the production of concrete blocks, avoiding their destination to illegal areas or landfills, contributing to urban sustainability.