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Previous issue date: 2012-02-16 / In the execution of civil engineering works, either by wasting during the coating of wall or
demolition of gypsum walls, the generation of the gypsum waste involves serious
environmental concerns. These concerns are increased by the high demand of this raw
material in the sector and by the difficulties of proper disposal byproduct generated. In the
search for alternatives to minimize this problem, many research works are being conducted,
giving emphasis in using gypsum waste as fillers in composites materials in order to improve
the acoustic, thermal and mechanical performances. Through empirical testing, it was
observed that the crystallization water contained in the residue (CaSO4.2H2O) could act like
primary agent in the expanding of the polyurethane foam. Considering that polyurethane
produced from vegetable oils are biodegradable synthetic polymers and that are admittedly to
represent an alternative to petrochemical synthetic polyurethane, this research consist an
analysis of the thermal behavior of a composite whose matrix obtained from a resin derived
from the expansive castor oil seed, with loads of 4%, 8%, 12% and 16% of gypsum waste
replacing to the polyol prepolymer blend. Contributors to this analysis: a characterization of
the raw material through analysis of spectroscopy by Fourier transform infrared (FTIR),
chemical analysis by X-Ray Fluorescence (XRF) and mineralogical analysis by X Ray
Diffraction (XRD), complemented by thermo gravimetric analysis (TGA). In order to
evaluate the thermo physical properties and thermal behavior of the composites manufactured
in die closed with expansion contained, were also carried tests to determine the percentage of
open pore volume using a gas pycnometer, scanning electronic microscopy (SEM), in
addition to testing of flammability and the resistance to contact with hot surfaces. Through the
analysis of the results, it appears that it is possible to produce a new material, which few
changes in their thermo physical properties and thermal performance, promotes significant
changes and attractive to the environment / Na execu??o de obras na constru??o civil, seja por desperd?cio de gesso durante o
revestimento de paredes ou na demoli??o de paredes de gesso acartonado, a gera??o do
res?duo implica em preocupa??es ambientais decorrentes da alta demanda dessa mat?ria
prima no setor e da dificuldade de destina??o adequada ao subproduto gerado. Na busca por
uma alternativa que atenue o problema, muitas pesquisas t?m sido realizadas com ?nfase na
utiliza??o do res?duo de gesso como carga em comp?sitos, com o intuito de melhorar os
desempenhos ac?stico, t?rmico e mec?nico. Atrav?s de ensaios emp?ricos, observou-se que a
?gua de cristaliza??o contida no res?duo (CaSO4.2H2O) pode atuar como agente prim?rio no
processo de expans?o de espumas de poliuretano. Considerando que os poliuretanos,
derivados de ?leos vegetais, s?o pol?meros sint?ticos biodegrad?veis e que,
reconhecidamente, representam uma alternativa aos poliuretanos sint?ticos petroqu?micos, a
presente pesquisa procura fazer uma an?lise do comportamento t?rmico de um comp?sito
desenvolvido com matriz de resina vegetal derivada do ?leo de mamona, com cargas de 4%,
8%, 12% e 16% de res?duo de gesso em substitui??o ? mistura poliol + pr?-pol?mero.
Contribu?ram para esta an?lise: caracteriza??o da mat?ria prima por meio de espectroscopia
de absor??o na regi?o do infravermelho por transformada de Fourier (FTIR), an?lise qu?mica
por FRX e mineral por DRX e an?lise termogravim?trica (TGA e DTA). Com o prop?sito de
avaliar as propriedades termof?sicas e o comportamento t?rmico dos comp?sitos produzidos
com expans?o contida por fechamento do molde. Tamb?m foram realizados ensaios para
determina??o do percentual de poros abertos, por meio de picn?metro a g?s, morfologia dos
comp?sitos (MEV), al?m de ensaios de inflamabilidade e de resist?ncia ao contato com
superf?cies aquecidas. Mediante a an?lise dos resultados obtidos, constatou-se a possibilidade
de produ??o de um novo material para isola??o t?rmica, apresentando poucas altera??es em
suas propriedades Termof?sicas, assim como em seu desempenho t?rmico, promovendo
altera??es significativas e atraentes ao meio ambiente
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/15586 |
| Date | 16 February 2012 |
| Creators | Oliveira Neto, Manoel Leonel de |
| Contributors | CPF:35846852491, http://lattes.cnpq.br/0490476694313938, Freire J?nior, Raimundo Carlos Silv?rio, CPF:02306444498, http://lattes.cnpq.br/1042806990155996, Medeiros, Otoniel Marcelino de, CPF:05686890463, http://lattes.cnpq.br/4877133404601046, Souza, Roberto Silva de, CPF:44466927472, http://lattes.cnpq.br/4012782800846844, Rahn, Marco Aur?lio dos Santos, CPF:56222343015, http://lattes.cnpq.br/2280627705940967, Marinho, George Santos |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Engenharia Mec?nica, UFRN, BR, Tecnologia de Materiais; Projetos Mec?nicos; Termoci?ncias |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/doctoralThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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