Made available in DSpace on 2014-12-17T14:07:16Z (GMT). No. of bitstreams: 1 JulianaEBC_DISSERT.pdf: 2646496 bytes, checksum: 07a391c02dbd435d514dc67c79541102 (MD5) Previous issue date: 2013-08-16 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / The environmental impacts, caused by the solid residues generation, are an often quoted concern nowadays. Some of these residues, which are originated from different human activities, can be fully reused, reducing the effects of the poor waste management on the environment. During the salt production process, the first formed crystals are discarded as industrial waste. This is mainly made of gypsum that is a calcium sulfate dihydrate (CaSO4.2H2O). The gypsum in question may go through a calcination process due to the plaster (CaSO4.0,5H2O) production and then the application on the cement industry. Considering the necessity of development and application for these industrial wastes, this paper aims to analyze the plaster, called Salgesso, from the gypsum that was generated during the salt production, and its use viability on the civil construction industry in order to create environmental and economical benefits. For characterization, the following experiments were performed: X-ray Fluorescence (XRF), X-ray Diffraction (XRD), thermal analysis (TG/DTG) and Scanning Electron Microscopy (SEM) with EDS. The following tests were also performed to obtain the mechanical characteristics: Thinness Modulus, Unit Mass, Setting Time and Compressive Resistance. Three commercial plasters used on civil construction were taken as references. All of these tests were performed according to the current standards. It was noticed that although there were some conflicting findings between the salt and commercial plasters in all of the studied properties, the Salgesso has its values within the standard limits. However, there is the possibility to improve them by doing a more effective calcination process. Three commercial plasters, used in construction, were used as reference material. All tests were performed according to standards in force. It was observed that although some tests present conflicting findings between the salt and gypsum plasters commercial properties in all of the studied Salgesso have values within the limits imposed by the standard, but can be improved simply by calcination process more effective / Os impactos ambientais, ocasionados pela gera??o de res?duos s?lidos, s?o uma preocupa??o bastante citada na atualidade. Alguns desses res?duos, provenientes das mais variadas atividades humanas, podem ser totalmente reaproveitados, diminuindo o efeito desses impactos, geralmente ocasionado pela m? disposi??o, no meio ambiente. Durante o processo de produ??o do sal, os primeiros cristais formados s?o descartados como res?duo industrial. Este ? constitu?do basicamente por gipsita, um sulfato de c?lcio di-hidratado (CaSO4.2H2O). A gipsita em quest?o pode passar por um processo de calcina??o para a produ??o do gesso (CaSO4.0,5H2O) e subsequente aplica??o na ind?stria cimenteira. Considerando a necessidade de desenvolvimento e aplica??o para estes res?duos industriais, o presente trabalho tem o objetivo de analisar o gesso obtido a partir da gipsita que foi gerada durante o processo de produ??o do sal, denominado Salgesso, e sua viabilidade de utiliza??o na ind?stria da constru??o civil, trazendo benef?cios ambientais e econ?micos. Para caracteriza??o, foram realizados os experimentos de: Fluoresc?ncia de raios X (FRX), Difra??o de raios X (DRX), an?lises t?rmicas (TG/DTG) e Microscopia Eletr?nica de Varredura (MEV) com EDS. Foram realizados tamb?m ensaios para a obten??o de caracter?sticas f?sicas como M?dulo de finura, Massa unit?ria, tempo de pega e resist?ncia ? compress?o. Tr?s gessos comerciais, utilizados na constru??o civil, foram usados como material de refer?ncia. Todos os ensaios foram realizados seguindo a normatiza??o vigente. Foi observado que, apesar de alguns ensaios apresentarem diverg?ncia de resultados entre os gessos salino e comerciais em todas as propriedades estudadas, o Salgesso tem valores dentro dos limites impostos pela norma. Entretanto, h? uma possibilidade de melhora por meio de um processo de calcina??o mais eficaz

Made available in DSpace on 2014-12-17T14:06:58Z (GMT). No. of bitstreams: 1 JaqueligiaBS_Capa_ate_referencias.pdf: 4148676 bytes, checksum: c08764d974461ebcf86494a06a296078 (MD5) Previous issue date: 2008-10-08 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior / In building, during the implementation process of major or even minor works, there is a considerable waste of plaster in the steps of coating, making it is a negative factor because of the loss of these processes constructive remains incorporated into buildings, as component, whose final dimensions are higher than those projected. Another negative factor is the disposal of waste gypsum in inappropriate places, thus contributing to the degradation of environmental quality, due to the leaching of this waste and may trigger the formation of sulfuric acid. Therefore, based on this picture, processing and reuse of waste coating, combined with the ceramics industry, which is a strong potential in the reuse of certain types of waste, promote mutual benefits. Thus the overall objective of this work is to conduct a search with scientific and technological aspects, to determine the effect of the incorporation of the residue of plaster for coating, from the building, the formulation of bodies for red ceramic. The residue of plaster coating was collected and characterized. They were also selected raw materials of two ceramic poles of the state of Rio Grande do Norte and formulations have been made with the intention of obtaining those with the best physical and mechanical properties, the residue was added the percentage of 5%, 10%, 15%, 20%, 25% and 30%, in the best formulation of ceramic industry 1 and, according the properties analyses, 5%, 10% and 15% as the best results of ceramic industry 2. The samples were sintered at temperatures of 850 ?C, 950 ?C and 1050 ?C, the heating rate of 5 ?C / min with isotherm of two hours. They were submitted to testing technology, such as lineal shrinkage, water absorption, apparent porosity, apparent density and bending resistence. The residue incorporation best results in the formulations of mass in red ceramic, were observed between the temperatures of 850 ?C and 950 ?C, in those formulations that have illite clays and medium plastic in their composition, in the range of 0% to 15% residue incorporated / Na constru??o civil, durante o processo de execu??o de grandes ou at? mesmo pequenas obras, h? um desperd?cio consider?vel de gesso nas etapas de revestimento, tornando-se este um fator negativo, pois parte das perdas destes processos construtivos permanece incorporada nas constru??es, na forma de componentes, cujas dimens?es finais s?o superiores ?quelas projetadas. Outro fator negativo ? a disposi??o dos res?duos de gesso em locais inadequados, contribuindo assim para a degrada??o da qualidade ambiental, devido ao processo de lixivia??o deste res?duo, podendo desencadear na forma??o de ?cido sulf?rico. Baseado neste panorama, a transforma??o e o reaproveitamento dos res?duos de revestimento, aliada ? ind?stria da cer?mica, que ? um forte potencial no reaproveitamento de alguns tipos de res?duos, promoveria benef?cios m?tuos. O objetivo geral deste trabalho foi de realizar uma pesquisa com aspectos cient?ficos e tecnol?gicos, para verificar o efeito da incorpora??o do res?duo de gesso para revestimento, proveniente da constru??o civil, na formula??o de massas para cer?mica vermelha. As mat?rias-primas foram coletadas de dois p?los cer?micos do Estado do Rio Grande do Norte e formuladas com o intuito de obter aquelas com as melhores propriedades f?sicas e mec?nica, tendo sido incorporados os percentuais 5%, 10%, 15%, 20%, 25% e 30% de res?duo, na melhor formula??o da ind?stria cer?mica 1 e, de acordo com a an?lise dos seus resultados, de 5%, 10% e 15% na melhor formula??o da ind?stria cer?mica 2. As amostras foram sinterizadas ?s temperaturas de 850 ?C, 950 ?C e 1050 ?C, ? taxa de aquecimento de 5 ?C/min com isoterma de duas horas e submetidas a ensaios tecnol?gicos, como retra??o linear de queima, absor??o de ?gua, porosidade aparente, massa espec?fica aparente e resist?ncia mec?nica ? flex?o. Os melhores resultados de incorpora??o do res?duo nas formula??es de massa de cer?mica vermelha foram observados na faixa de temperatura de 850 ?C a 950 ?C, naquelas que possuem argilas il?ticas e medianamente pl?sticas em sua composi??o, na faixa de 0% a 15% de res?duo incorporado