Detalhes bibliográficos
| Ano de defesa: |
2021 |
| Autor(a) principal: |
Pimentel, Amanda Carolina |
| Orientador(a): |
Santos, Cláudia Lange dos |
| Banca de defesa: |
Júnior, Claudir Gabriel Kaufmann Junior,
Mortari, Sérgio Roberto |
| Tipo de documento: |
Dissertação
|
| Tipo de acesso: |
Acesso embargado |
| Idioma: |
por |
| Instituição de defesa: |
Universidade Franciscana
|
| Programa de Pós-Graduação: |
Programa de Pós-Graduação em Nanociências
|
| Departamento: |
Biociências e Nanomateriais
|
| País: |
Brasil
|
| Palavras-chave em Português: |
|
| Palavras-chave em Inglês: |
|
| Área do conhecimento CNPq: |
|
| Link de acesso: |
http://www.tede.universidadefranciscana.edu.br:8080/handle/UFN-BDTD/1011
|
Resumo: |
Civil construction has evolved so much that technology has become an ally in the quality search in the materials, mixtures and structures. Reinforced concrete, the main construction method used in Brazil, admits variations in properties and strengths according of the composition and additives adopted, aiming to meet project specifications. Increasingly, nanotechnology has been inserted as an application for the engineering branch in order to improve properties such as the porosity and mechanical resistance of these mixtures, mainly due to characteristics of high surface area and nanometric dimension. In this context, this study aimed to simulate the interaction of graphene oxide (GO) with calciunm oxide (CaO) the mains constituent of cement, and GO incorporated with ferrite (Fe3O4). Furthermore, this work was to evaluate the effect of adding nanoparticles with incorporations of ferrite in the concrete mixture for comparative purposes of mechanical strength, by an experimental study. The theorerical study of Density Funcitional Theory shows a stron interaction of GO with the CaO molecule, with indicate a structural affinity, and a week interaction between GO and Fe3O4, that can enabling the disruption of these bonds. So, graphene oxide (GO), nanosilica (NS) and nanocellulose (NC) were synthesized and, as well as graphite nanopatelets (GR), incorporated with ferrite (Fe3O4) in the proportions 1:5 and 1:10 (in the ratio mass: mass). The nanoparticles were characterized by the methods of X-ray Diffraction (XDR), Fourier-transform Infrared Spectroscopy (FT-IR), Scanning Electron Microscopy (SEM) and Dispersive Energy Sistem (EDS) which confirmed the peaks and characteristics related to them and their nanometric dimensions. When being added in concrete, in the 0.03% proportion by weight of the cement following the referring norms, tests of workability (Slump Test) and resistance to the compressive forces were carried out. The first one demonstrated that the mixture remained workable and viscous in a similar way in all samples, varying only 1.5 cm from the 16 cm of the reference sample (without the addition of nanoparticles). The compression test showed that and nanocellulose incorporated with ferrite reduced the mechanic resistence by up to 11% when compared to the reference sample, while graphite nanoplatelets incorporated with ferrite in the proportion 1:5 (GR 05) added resistance values of 8%, as well as samples of nanosílica, NS.Fe3O4, GR and GR.Fe3O4 in a 1:10 which also resulted in significant increases. Finally, it was concluded that the nanoparticles incorporated with ferrite are potential additives for concrete and possibly reinforced concrete. |
