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Previous issue date: 2007-06-02 / The potential market of the metropolitan area of Salvador accounts for the estimated consumption of roughly 800 million horizontally perforated extruded clay bricks a year. The growing demand of consumers along with the competitiveness of the structural ceramic sector has driven forward a number of recent efforts and investments towards improving the quality of structural ceramics. In this scenario, the
present study focused on sampling and evaluating the conformity of 8-hole horizontally perforated extruded clay bricks manufactured by different plants (A, B and C) in the metropolitan area of Salvador. In addition, representative clay and sandy-clay materials were collected from each plant and characterized by conventional physical, chemical and mineralogical techniques. Finally, experimental compositions designated as A, B and C, according to the source, were prepared by mixing different contents of the raw materials collected in the plants, fired at different temperatures and characterized. The results revealed a series of non conformities regarding ABNT guidelines. The characterization of raw materials revealed the presence of kaolinite and ilite in concentrations ranging from 64 to 90 wt.% along with free quartz (10 - 25%). The sandy-clay samples consisted basically of kaolinite. All raw materials depicted low contents of organics, amorphous constituents, alkaline oxides and feldspar. An analysis of the firing behavior of all different ceramic compositions revealed that the linear contraction of composition A was rather significant considering the temperature range evaluated, and it justifies the significant dimensional non conformity that was shown by bricks made with the ceramic A / O mercado potencial de cer?mica estrutural na regi?o metropolitana de Salvador ? respons?vel pelo consumo de mais de 800 milh?es de pe?as/ano. Com um com?rcio
cada vez mais exigente e competitivo torna-se necess?rio que as ind?strias ceramistas invistam em a??es que visem aperfei?oar a qualidade de seus produtos. O objetivo desse estudo foi avaliar o ?ndice de conformidade de blocos cer?micos e caracterizar a mat?ria-prima. Foram empregadas as normas ABNT para an?lise de conformidade de blocos cer?micos em tr?s ind?strias (A, B e C) da Regi?o
Metropolitana do Salvador, bem como t?cnicas para caracteriza??o qu?mica, f?sica e mec?nica das mat?rias-primas e formula??o e an?lise das massas. Com base nos resultados alcan?ados pode-se concluir que os blocos cer?micos fabricados pelas ind?strias pesquisadas n?o apresentam conformidade com as normas t?cnicas brasileiras. Os argilominerais encontrados nas mat?rias-primas estudadas (massas A, B e C) foram a caulinita e a ilita que ficaram entre 64 a 90% e o teor de quartzo livre entre 10 e 25%. Os arenosos s?o predominantemente argilas caulin?ticas. Os materiais caracterizados apresentaram baixa concentra??o de materiais amorfos, baixo teor de ?xidos alcalinos e, conseq?entemente, concentra??es muito baixas de
feldspatos. A an?lise das curvas de gresifica??o das massas demonstra que a inclina??o da curva de retra??o linear ? mais acentuada para a massa A, na faixa de temperatura estudada, e justifica a significativa n?o conformidade dimensional verificada nos blocos produzidos pela cer?mica A
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/15524 |
| Date | 02 June 2007 |
| Creators | Couvignou, Eliana Mac?do |
| Contributors | CPF:15724520800, http://lattes.cnpq.br/0022988322449627, Nascimento, Rubens Maribondo do, CPF:80732810400, http://lattes.cnpq.br/8671649752936793, Sobral, Maria Dorot?ia Costa, CPF:16314280559, http://lattes.cnpq.br/5119921083052408, Martinelli, Ant?nio Eduardo |
| 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/masterThesis |
| 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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