05.1 - Graduação (UACSA)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/2909
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Resultados da Pesquisa
Item Produção de concretos com resíduos de poliuretano triturado em substituição ao agregado miúdo(2021-12-08) Pereira, Wesley Batista; Galvão, Simone Perruci; http://lattes.cnpq.br/1523292800241605; http://lattes.cnpq.br/7022069132421368The reuse of potential materials that would otherwise be sent to landfills or stored in incorrect locations, contributing to the pollution of water courses and influencing the sewage system of cities and the most varied damages to the environment and the population, is a reality each more current. Among these materials, the polyurethane polymer (PU) stands out in its many variations, where its reintroduction into the production chain brings socio-environmental advantages. This article presents a comparative analysis between a mix of conventional concrete and concretes with partial replacements of fine aggregate by crushed expanded polyurethane waste, from refrigerator scrap, in 5% and 10% contents, replaced in relation to the volume of the sand, this procedure was also performed for a mix with the addition of silica fume. Two pilot traces were developed, one with silica (CS) and one without silica (SS). The properties of the concrete produced were evaluated through the slump test of the cone trunk (NBR 16889: 2020), analysis of compressive strength (NBR 5739: 2018), tensile strength by diametrical compression (NBR 7222:2011), mass specific and water absorption (NBR 9778:2005). The results obtained from this study demonstrate that the increase in the amount of PU foam in concrete reduced significantly the specific mass and reduced the mechanical strength of the part. It is noteworthy that the use of silica fume can be a differential in the production of concrete with recycled aggregates such as expanded PU foam, so that the resistances are maintained.Item Proposta de um método de dosagem para concreto leve(2022-06-01) Pereira, Wesley Batista; Galvão, Simone Perruci; http://lattes.cnpq.br/1523292800241605; http://lattes.cnpq.br/7022069132421368There are several methodologies for Portland cement concrete dosage, among these, the method recommended by the Technological Research Institute of the State of São Paulo - IPTUSP, this is widespread in Brazil. Although it does not present dosage factors for lightweight concrete, therefore this paper aims to propose a dosage method based on the IPT method for lightweight concrete with EPS. The concrete was dosed with CPV ARI cement, sand and EPS, and two volumes of aggregates (m) were made, thus making a rich and a poor trace, For this, two aggregate contents (m) were executed, thus making a rich and a poor mix, being them: 1:1, 1:2 (aggregates mix in real volume (L) per kg of cement), respectively. Then, each mix (1:m) was dosed with three different levels of EPS (25, 50 and 75%, in relation to each "m"). The properties of the concretes were evaluated in the fresh state, through the slump test (ABNT NBR 16889:2020) and specific mass through the known volume method, and, in the hardened state, by the specific mass test (ABNT NBR 9778:2005) and compressive strength (ABNT NBR 5739:2018). With the results obtained from this study, it was possible to elaborate a dosage diagram for each “m” analyzed, obtaining the values of the EPS content, projection of compressive and slump resistance, indicated in a dosage abacus made from the test results, these parameters are essential for the determination of the concrete mix.