Dissertações em Engenharia de Infraestrutura e Desenvolvimento Energético (Mestrado) - PPGINDE/NDAE/Tucuruí

URI Permanente para esta coleçãohttps://repositorio.ufpa.br/handle/2011/9401

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Acesso aberto (Open Access)
Placas cimentícias produzidas com a incorporação de pérolas de poliestireno expandido (EPS)
(Universidade Federal do Pará, 2020-09-01) SILVA, Max Weverton Moreira da; CORDEIRO, Luciana de Nazaré Pinheiro; http://lattes.cnpq.br/9126233381230999; https://orcid.org/0000-0001-7931-4042
The Internal and External Vertical Painel Systems are the parts of the residential building that limit it vertically and delimit its environments, such as facades and walls or internal partitions. The use of seals with lower density than masonry provides a reduction in the mass of this subsystem, reducing the demand for aggregates and binders, in addition to reducing the load on the structure, which allows for optimization of its design. The objective of this work is to verify the viability of the production of cementitious slabs with the incorporation of expanded polystyrene (EPS) beads for application in internal vertical sealing elements. For this, mortars with a 1: 3 line (cement: sand) were produced, with levels of incorporation of expanded polystyrene of 0%, 10%, 20% and 30% in relation to the total volume of materials. Mortars were characterized in the fresh state, through the determination of mass density and consistency index, and in the hardened state, for knowledge of the density properties in the hardened state, resistance to compression and traction, and modulus of elasticity. After knowing the characteristics of the mortars, cementitious slabs were produced, reproducing the same trace in the specimens. The plates were tested for bulk density, water absorption, water permeability and flexural strength. The results of this work demonstrated that the cementitious slabs with the incorporation of up to 20% of EPS present technical characteristics for application in internal vertical sealing systems.
Acesso aberto (Open Access)
Utilização de rejeito de minério do cobre como agregado miúdo na produção de concreto
(Universidade Federal do Pará, 2019-03-29) SOUSA, Douglas Martins; SOUZA, Paulo Sérgio Lima; http://lattes.cnpq.br/4933212993218783
A major concern with recent accidents involving tailings dams has again raised the urgent need for mining companies to adapt to the fate of ore tailings generated by their operations. In this context, the reuse of these materials in the construction industry shows itself to be an excellent alternative. In this research, it was evaluated the reuse of copper mining waste as a partial substitute for the small aggregates in the production of conventional concretes, aiming the evaluation of the mechanical performance of the concrete produced with this material, also if it is objective, to obtain a material destination sustainable for this material. Only in the mine where the material was collected, is there about 160 million tons of this material accumulated in the mine tailings basin, which shows that there is a considerable source of this material available for reuse. In the experimental program there were four study series: one reference composed of concrete without the addition of the tailings, and another three with 15%, 30% and 45% of substitution to the small aggregates, besides the use of two water ratios /cement. Fresh tests were carried out to evaluate the influence of the reject on the plastic properties of the concrete, and in the hardened state, test specimens were tested at 07 and 28 days for the axial compressive strength, diametral compression traction, traction in flexion and modulus of elasticity. The results obtained were statistically treated through analysis of variance (ANOVA) and proved for the substitution parameter of reject, there was significance. The results showed that the samples with substitution of tailings obtained good results, significantly increasing both the tensile strength and the compressive strength of the concrete when compared with reference series under the same conditions. Therefore, copper reject shows an excellent potential to be reused in the production of concrete, with respect to its effects on the mechanical properties of the concrete, in addition to achieving a more sustainable destination than today.

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