Caracterización colorimétrica del proceso termogravimétrico de la deshidroxilación de caolín hidrotermal y de toba

Giorgio E. A. López-Pardo; Cesar A. Garcia-Guerra; Roberto Lainfiesta; Edward M. A. Guerrero-Gutiérrez

doi:10.36829/63CTS.v9i1.924

Authors

Giorgio E. A. López-Pardo Escuela de Ingeniería Química, Facultad de Ingenieria, Universidad de San Carlos de Guatemala https://orcid.org/0000-0002-8060-6437
Cesar A. Garcia-Guerra Escuela de Ingeniería Química y Centro de Investigaciones de Ingeniería, Facultad de Ingeniería, Universidad de San Carlos de Guatemala https://orcid.org/0000-0001-9432-2438
Roberto Lainfiesta Escuela de Ingeniería Química, Facultad de Ingeniería, Universidad de San Carlos de Guatemala https://orcid.org/0000-0001-8881-9712
Edward M. A. Guerrero-Gutiérrez Escuela de Ingeniería Química, Facultad de Ingeniería, Universidad de San Carlos de Guatemala https://orcid.org/0000-0002-5778-3953

DOI:

https://doi.org/10.36829/63CTS.v9i1.924

Keywords:

metakaolin, calcination, density, dehydroxylation

Abstract

Metakaolin is a product of kaolin's calcination. The high pozzolanic activity of metakaolin allows its usage as supplementary cementitious material in concrete. This property and other physicochemical properties are affected by metakaolin's manufacturing conditions. Therefore, this study aims to characterize the changes in color and density of two types of kaolin (tuff and hydrothermal) through a thermogravimetric analysis of the calcination process. Evaluation of density used ASTM C188, while the assessment of color changes used a CIE-L*a*b* spectrophotometer in conjunction with normative UNE 80117. In addition, weight loss and density were correlated with the color coordinates using polynomial regression. The results showed that kaolin dehydroxylation occurred at 450ºC and 550ºC, characterized by a maximum in delta E * of 12.9 and 4.3 for hydrothermal and tuff kaolin, respectively. In addition, the tuff kaolin presented the maximum luminosity (L * = 92.84) of all the treatments at 21ºC. This value decreased 11.75% during the temperature increment up to 450ºC. From this temperature, L * increased linearly until reaching a final value of 87.3 at 900ºC. The polynomial regression explained 93% and 92% of the weight variation as a function of the CIE-L*a*b* parameters for tuff and hydrothermal kaolin, respectively.

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