Avaliação de pavers de concreto com agregado reciclado de PET para aplicação em ambiência rural

Abstract

The present work aims to reproduce a common product ( interlocking concrete pavers) using na alternative material ( PET sand ) and validate some of its properties to enable its applications in rural environments (areas for loading and unloading, agricultural warehouse floors parking lots, storage facility floors, parkinglots, pens, among other applications).The choice of PET residue is justified by difficulty in degrading in nature (400 years) and also by the literature indicating potencial for its use in cementious matrices.The metodology of this reserach was organized into four distinct strages:mix design study,productions of concrete pavers, quality control test,and analysis of results and conclusion.From preliminar mix design studies, a mix (T1) was defined aiming to achieve structural concrete strength (50Mpa).This mis was referrd to as Reference Mix as It had fine aggregate composed of 100% natural sand.Based on the definition ofthe reference mix, two other mixes were produced with partial replacement of natural sand by PET sand.Mix 2 (T-2)wasproduced using a volume replacement Percentage of 15% of natural sand by PET sand,and mix3 (T-3)was procedwith a replacement percentage of 20%.The manufacturing of the pavers was classified as ”sleeper units” wich are manually produced pieces.In this manufacturing process, the plastic concrete is poured into molds where it remains overnigtht,and the demolding removal of pavers from the molds)takes place. After demolding,the pavers were indentified and subjected to a submerged curing process,remaining in this conditing until the age of the quality control tests(28 days).The pavers were tested according to normative prescritions for determining axial compressive strength and water absorotion by capilarity.The metodology inolves dosage study, production, control test, and result analysis.T-2 and T-3 mixes partially reaplace natural sand with PET sand.The incorporations of. PET sand in the mix contributes to better clouser of the matrix prorosity, resulting in lower water absorrption by capilallary compared to the reference mix (with 100% natural sand).