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Otimização da Adição de Gesso em Cimentos Produzidos na Maceira e Pataias
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O cimento é um dos materiais de construção mais vendidos em todo o mundo, pois este pó fino
forma com a água uma pasta plástica ligante que possui inúmeras características, daí o seu intenso uso
na construção civil. Respeitando todas as normas e requisitos de produção do cimento, torna-se cada
vez mais importante otimizar as propriedades deste agregado, aperfeiçoando-o para os diversos usos de
maneira a reduzir os custos de produção deste material assegurando sempre a sua conformidade.
O objetivo deste trabalho consiste na otimização da adição de gesso na incrementação do cimento,
levando ao desenvolvimento das resistências mecânicas, flexão e compressão do cimento endurecido,
aperfeiçoando a quantidade de adição de gesso para a obtenção de altas resistências mecânicas,
característica muito importante no cimento.
O gesso é responsável pelo controlo do tempo de presa, garantindo o manuseamento do cimento,
uma vez que o gesso é capaz de controlar as reações iniciais dos aluminatos com a água, prevenindo o
tempo de presa imediato.
Para a realização deste estudo, foi recolhido clínquer, gesso de dois fornecedores e filler, materiais
usados na preparação das várias amostras de cimento. Foram realizados ensaios físicos e químicos tanto
aos materiais recolhidos bem como às amostras preparadas em laboratório tais como: influência da
mineralogia e da composição química – aparelho de Raio-X, teor de SO3 no forno de indução e
características físicas como granulometria dos materiais e das misturas de cimento e desenvolvimento
das resistências mecânicas aos 2, 7 e 28 dias de hidratação.
Resultante das várias análises efetuadas no laboratório da Secil, determinou-se que teores entre
2.90% a 3,26% de SO3 no cimento são os valores que potencializam alta resistência mecânica
relativamente à compressão nos cimentos, estes valores que são compatíveis com a literatura e que
respeitam a norma de requisitos químicos do teor de sulfatos (em SO3).
Cement is one of the best-selling construction materials in the world, because this fine powder forms with water a binding plastic paste that has numerous characteristics, hence its intense use in construction. While respecting all the norms and requirements of cement production, it is becoming increasingly important to optimize the properties of this aggregate by improving it for various uses in order to reduce the production costs of this material while ensuring its conformity. The objective of this work is to optimize the addition of gypsum in the increment of cement, leading to the development of mechanical strengths, bending and compression of hardened cement, improving the amount of gypsum addition to obtain high mechanical strengths, the most important characteristic in cement. The gypsum is responsible for controlling the setting time, being possible to ensure the handling of the cement, since the gypsum is able to control the initial reactions of aluminates with water, preventing the immediate setting time. For this study, clinker, two types of gypsum and filler were collected, materials used in the preparation of the various cement samples. Physical and chemical tests were performed on both the materials collected and the samples prepared in the laboratory, such as: the influence of mineralogy and chemical composition - X-ray apparatus, SO3 content in the induction furnace and physical characteristics such as grain size of the materials and cement mixtures and development of mechanical strengths at 2, 7 and 28 days of hydration. As a result of the various analyses carried out in the Secil laboratory, it was determined that contents between 2,90% and 3.26% of SO3 in cement are the values that potentiate high mechanical strength relative to cement compression, which are compatible with the literature and comply with the standard chemical requirements of the sulfate content (in SO3).
Cement is one of the best-selling construction materials in the world, because this fine powder forms with water a binding plastic paste that has numerous characteristics, hence its intense use in construction. While respecting all the norms and requirements of cement production, it is becoming increasingly important to optimize the properties of this aggregate by improving it for various uses in order to reduce the production costs of this material while ensuring its conformity. The objective of this work is to optimize the addition of gypsum in the increment of cement, leading to the development of mechanical strengths, bending and compression of hardened cement, improving the amount of gypsum addition to obtain high mechanical strengths, the most important characteristic in cement. The gypsum is responsible for controlling the setting time, being possible to ensure the handling of the cement, since the gypsum is able to control the initial reactions of aluminates with water, preventing the immediate setting time. For this study, clinker, two types of gypsum and filler were collected, materials used in the preparation of the various cement samples. Physical and chemical tests were performed on both the materials collected and the samples prepared in the laboratory, such as: the influence of mineralogy and chemical composition - X-ray apparatus, SO3 content in the induction furnace and physical characteristics such as grain size of the materials and cement mixtures and development of mechanical strengths at 2, 7 and 28 days of hydration. As a result of the various analyses carried out in the Secil laboratory, it was determined that contents between 2,90% and 3.26% of SO3 in cement are the values that potentiate high mechanical strength relative to cement compression, which are compatible with the literature and comply with the standard chemical requirements of the sulfate content (in SO3).
Descrição
Palavras-chave
clínquer gesso SO3 cimento resistências mecânicas compressão