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Previous issue date: 2016-09-02 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior (CAPES) / Dentre os argilominerais largamente estudados e aplicados na grande ?rea dos materiais cer?micos e outras ?reas, a caulinita se destaca, devido as suas caracter?sticas e desempenho tecnol?gico. O Estado do Rio Grande do Norte, possui um grande potencial na explora??o deste mineral, onde a principal forma de extra??o ? a lavra. O caulim desta regi?o, caracteriza-se como de origem prim?ria interperizada, devido a sua forma??o e caracter?sticas locais, diferenciando-o dos caulins de outras regi?es. Para isso, o caulim obtido foi submetido a um tratamento t?rmico, onde foi constatada uma gradativa amorfiza??o da estrutura cristalina caracter?stica do material. Com a obten??o da forma amorfa em laborat?rio, tamb?m denominada metacaulinita, foi poss?vel a realiza??o de uma investiga??o sobre as caracter?sticas pozol?nicas frente a outro material j? consolidado no mercado. Dessa forma o objetivo deste trabalho ? investigar a amorfiza??o do caulim industrial, oriundo da regi?o pegmat?tica do Serid? do RN, e comparar a sua atividade pozol?nica com um metacaulim comercial amplamente utilizado. Para isto, foram usadas as t?cnicas de Fluoresc?ncia de raios X (FRX); Difra??o de raios X (DRX); An?lise Termogravim?trica (TG); An?lise T?rmica Diferencial (DTA); Microscopia Eletr?nica de Varredura (MEV); Granulometria a Laser; Massa Espec?fica e ?ndice de Atividade Pozol?nica com a Cal. Ap?s as caracteriza??es pode-se observar que o metacaulim oriundo da regi?o em estudo possui boas caracter?sticas qu?micas e mineral?gicas, com a obten??o de um bom grau de amorfiza??o em baixas temperaturas e distribui??o granulom?trica pr?xima do material comercial analisado. A partir do resultado da atividade pozol?nica, o metacaulim obtido em laborat?rio apresentou um grande potencial na forma??o das fases hidratadas, sendo de grande import?ncia na ?rea de cimenta??o, dentre outros. / Among the clay minerals widely studied and applied in the large area of ceramic materials and other areas, kaolinite stands out due to its characteristics and technological performance. The State of Rio Grande do Norte has great potential in the exploration of this mineral, where the main form of extraction is the mining. The kaolin of this region, is characterized as of primary interperizada origin, due to its formation and local characteristics, differentiating it of the Kaolins of other regions. For this, the obtained kaolin was submitted to a thermal treatment, where a was verified a gradual amorphization was found of the crystalline structure characteristic of the material. By obtaining the amorphous form in the laboratory, also called metacaulinite, it was possible to carry out an investigation on the pozolanic characteristics compared to other materials already consolidated in the market. Thus the objective of this work Is to investigate the amorphization of industrial kaolin, coming from the pegmatitic region of Serid? RN, and to compare its pozzolanic activity with a commercially used metakaolin. For this, we used the techniques of fluorescence X-ray (XRF); X-ray diffraction (XRD); Thermogravimetric Analysis (TG); Differential Thermal Analysis (DTA); Scanning Electron Microscopy (SEM); Laser Granulometry; Specific Mass and Pozzolanic Activity Index with Cal. After characterization, it can be observed that metakaolin from the study region It has good chemical and mineralogical characteristics, with a good degree of amorphization at low temperatures and distribution close to the commercial material analyzed. From the result of pozzolanic activity the metakaolin obtained in the laboratory, presented a great potential in the formation of the hydrated phases, being of great importance in the area of cementation, among others.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/23380 |
| Date | 02 September 2016 |
| Creators | Ara?jo, Everton Henrique Andrade de |
| Contributors | 04514998320, http://lattes.cnpq.br/5840621182000517, Melo, V?tor Rodrigo de Melo e, 05298014429, http://lattes.cnpq.br/0892282595815754, Barbosa, Carina Gabriela de Melo e Melo, 06575109470, Galdino, Jos? Nildo, 87555492415, http://lattes.cnpq.br/3713583703008385, Melo, Marcus Antonio de Freitas |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM CI?NCIA E ENGENHARIA DE MATERIAIS, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| 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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