Thesis (Ph. D.)--School of Civil and Environmental Engineering, Georgia Institute of Technology, 2004. Directed by J. Carlos Santamarina. / Vita. Includes bibliographical references (leaves 183-192).

Made available in DSpace on 2014-12-17T14:58:24Z (GMT). No. of bitstreams: 1 AngelicaGSL_DISSERT.pdf: 1633829 bytes, checksum: a49da749db1c036dad950f4eca7e9db7 (MD5) Previous issue date: 2011-02-28 / The segment of the structural ceramics industry is one of the most important to the economy of Rio Grande do Norte. The supply chain makes a total of 206 companies that are distributed in 39 counties, concentrated in three regional centers: Serid? Apodi / Assu and great Natal. The ceramic industry in the state is around 80 million pieces per month, with 50,186 million of these tiles, which makes the Rio Grande do Norte one of the largest manufacturers of product in the Country. Different ceramic products can be manufactured by mixing two or more clays and accessory minerals. Mixtures acquire characteristics and form what is called the ceramic body. Refractory masses have a high melting point and thermal shock support. Its composition contains refractory clays with a little iron oxide and material fluxes. A line of semi-refractory ceramic products that stands out for its high added value are the bricks in ivory or red, used in building barbecues, fireplaces, wood stoves and braziers. The aim of this study was to use alumina-clay or silica- alumina-clay to the industrial RN, for the production of refractory bricks semi-refractory burning light. Clay and Kaolin were characterized for their chemical and mineralogical composition, immediately after ceramic bodies were made with different concentrations of the components, they were raised, pressed and sintered. After sintering the resulting products were characterized in terms of mechanical, thermal and dimensional than the characterization by X-ray diffraction and scanning electron microscopy. After obtaining the results, we concluded that the studied clay can be used for the production of semi-refractory bricks / O segmento da ind?stria cer?mica estrutural ? um dos mais importantes para a economia do Rio Grande do Norte. A cadeia produtiva soma um total de 206 empresas que est?o distribu?das em 39 munic?pios e concentradas em tr?s p?los regionais: Serid?, Apodi/Assu e na grande Natal. A produ??o da ind?stria cer?mica no Estado gira em torno de 80 milh?es de pe?as/m?s, sendo 50.186 milh?es delas telhas, o que faz do Rio Grande do Norte um dos maiores fabricantes do produto no Pa?s. Diferentes produtos cer?micos podem ser fabricados atrav?s da mistura de duas ou mais argilas com minerais acess?rios. As misturas adquirem caracter?sticas pr?prias e formam o que se denomina massa cer?mica. Massas refrat?rias apresentam alto ponto de fus?o e suportam choque t?rmico. Sua composi??o cont?m argilas refrat?rias pobres em ?xido de ferro e materiais fundentes. Uma linha de produtos cer?micos semi-refrat?rios que se destaca pelo seu alto valor agregado s?o os tijolos aparentes na cor marfim ou avermelhado, utilizados na constru??o de churrasqueiras, lareiras, fog?es a lenha e braseiros. O objetivo do presente trabalho foi estudar a utiliza??o de argilas aluminosas ou s?lico-aluminosas do parque industrial do RN, para a produ??o de tijolos semi-refrat?rios de queima clara. A argila e o caulim foram, caracterizadas quanto ? sua composi??o qu?mica e mineral?gica, logo ap?s foram formuladas massas cer?micas com diferentes concentra??es dos componentes, estas foram formuladas, prensadas e sinterizadas. Ap?s a sinteriza??o os produtos resultantes foram caracterizados do ponto de vista mec?nico, t?rmico e dimensional al?m da caracteriza??o por difratometria de raios-X e microscopia eletr?nica de varredura. Com a obten??o dos resultados pudemos concluir que a argila estudada pode ser utilizada para a produ??o de tijolos semi-refrat?rios