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Additions of Minerals in Clays of Morelia Region, Mexico: Effects on Volumetric Stabilization and Color

Published online by Cambridge University Press:  16 August 2012

W. Martínez Molina ,
J. L. Ruvalcaba Sil ,
E. M. Alonso Guzmán ,
A. Flores Rentería ,
M. Manrique Ortega  and
A. A. Torres Acosta
W. Martínez Molina
Affiliation:
Facultad de Ingeniería Civil de la Universidad Michoacana de San Nicolás de Hidalgo, Edificio F de Ciudad Universitaria, Avenida Francisco J. Mújica s/n, Colonia Felícitas del Río, Morelia, Michoacán, Mexico CP 58040, Mexico. e-mail: wilfridomartinezmolina@gmail.com; eliamercedesalonso@gmail.com
J. L. Ruvalcaba Sil
Affiliation:
Instituto de Física, Universidad Nacional Autónoma de México UNAM, Mexico. e-mail: sil@fisica.unam.mx
E. M. Alonso Guzmán
Affiliation:
Facultad de Ingeniería Civil de la Universidad Michoacana de San Nicolás de Hidalgo, Edificio F de Ciudad Universitaria, Avenida Francisco J. Mújica s/n, Colonia Felícitas del Río, Morelia, Michoacán, Mexico CP 58040, Mexico. e-mail: wilfridomartinezmolina@gmail.com; eliamercedesalonso@gmail.com
A. Flores Rentería
Affiliation:
Facultad de Ingeniería Civil de la Universidad Michoacana de San Nicolás de Hidalgo, Edificio F de Ciudad Universitaria, Avenida Francisco J. Mújica s/n, Colonia Felícitas del Río, Morelia, Michoacán, Mexico CP 58040, Mexico. e-mail: wilfridomartinezmolina@gmail.com; eliamercedesalonso@gmail.com
M. Manrique Ortega
Affiliation:
Instituto de Física, Universidad Nacional Autónoma de México UNAM, Mexico. e-mail: sil@fisica.unam.mx
A. A. Torres Acosta
Affiliation:
Universidad Marista de Querétaro, Querétaro Centro Histórico, CP 76000, Querétaro, Mexico.
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Abstract

Clays were used intensively in cultural heritage’s monuments and objects. Conservation procedures can be performed specifically for earthen materials using stabilized clays, considering that the aesthetic features must be preserved in order to avoid drastic differences and the lost of their patrimonial value.

This work presents the study of the mechanical behavior of clay stabilized with different materials following the norm ASTM D 6276 – 99a, for lime stabilization. The effects of other stabilizers on the clay were studied as well. For these purposes, lime, gypsum, Portland cement (type II), sodium hydroxide, and dehydrated cactus fibers of white cactus opuntia in concentrations of 2, 4, 6, 8 and 10 wt% were added to a clay from Morelia region.

Atterberg limits were determined to calculate the linear and volumetric stabilization. The best volumetric stabilization values were chosen to prepare samples to measure the mechanical behavior under compression, tension and flexion strengths. Colorimetric measurements were also performed on the stabilized clays to determine the best preparation with the most suitable aesthetic qualities to perform conservation treatments on monuments and cultural heritage constructions made with earthen materials.

The highest values for compression were observed for gypsum and mucilage additions while the highest tension was obtained for mucilage ones. Gypsum addition had the bigger rupture module under flexion. On the other hand, the color of the stabilized clay is closer to the original clay color for cement, lime and mucilage preparations.

Keywords

stress/strain relationshipelastic propertiesenvironmentally protective
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1374: Symposium S8 – Cultural Heritage and Archaeological Issues in Materials Science , 2012 , pp. 215 - 224
Copyright
Copyright © Materials Research Society 2012

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