Examinando por Materia "CLAY"

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  • Miniatura
    PublicaciónAcceso abierto
    Aplicación de redes neuronales en la clasificación de arcillas
    (2013-11-13) Gómez, Jairo; Sánchez, Jaime; Ocampo, Aquiles; Restrepo, José William; Aplicação de redes neuronais na classificação de arcillas
    Clays are the main raw material in the manufacture of products for the construction sector, such as tile, veneer, flooring and bricks. Small and medium enterprises generally use brick clays of different mineralogical origin, classified in order to formulate their mixtures according to the production team experience; the uncertainty associated with this method causes that a portion of their manufactured products are rejected, because their properties do not meet the technical specifications. This paper presents a methodology based on neural networks for classification of clays, based on the clay properties to be used to make the pasta, with the aim of reducing the number of rejected products. It used different network topologies for classification, and chose the one which have been found capable to predict the training and testing samples with an accuracy of 97.79 % and 94.12 %, respectively.
  • Miniatura
    PublicaciónAcceso abierto
    Uso de la espectroscopia IR para estudiar la transformación térmica que experimenta una arcilla caolinítica
    (2013-11-06) Mejía, J. E. (Julio Eduardo); Bolaños, J. O. (Javier Oswaldo); Rodríguez, Jorge Enrique
    To promote the use of local raw materials (La Tetilla, Cauca) it is necessary to know more about their structural features and their response to certain treatments, including thermal treatments. In this work, a local raw material (La Tetilla, Cauca) was thermally treated and its behavior was studied with IR spectroscopy. Using a deconvolution band method and the integrated area concept to treat the results, we can describe the structural transformation of this clay that contained kaolin. The results of IR spectroscopy showed that the solid presented an important transformation between 500 y 700 °C. This process was determined because in this temperature range the integrated area of the bands associated to kaolin (~3629 and ~3695 cm-1), and to Al-OH (~910 cm-1) and Si-O-Al (~532 cm-1) decreased. On the other hand, in this range the surface OH (~3465 cm-1) and S i-O-Si bonds (~470 cm-1) increased.