Abstract
Values for the linear thermal expansion coefficients (β) of some Brazilian granitic rocks commercially used as facings for building are presented. The coefficients were determined within a temperature range of 0 to 50 °C, with the temperature raised at a rate of 0.3 °C/min. The values obtained were related to the apparent porosity, grain size and quartz content of the rocks. It is concluded that while β increases with an increase in quartz content, it decreases with increases in apparent porosity and mineral grain size.
Résumé
Ce travail présente les valeurs du coefficient linéaire de dilatation thermique β de quelques roches granitiques du Brésil utilisées en parement de façade. Les coefficients ont été déterminés dans une gamme de température 0-50°C, avec une vitesse de montée en température de 0,3°C.min–1. Les valeurs obtenues ont été corrélées avec la porosité apparente, la taille des grains et la teneur en quartz des roches. On constate que β augmente lorsque la teneur en quartz augmente, mais diminue lorsque la porosité apparente ou la taille des grains augmentent.
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Acknowledgements
The authors would like to thank the Instituto de Pesquisas Tecnológicas do Estado de São Paulo (IPT) and the Universidade Estadual Paulista (Unesp-Rio Claro).
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Janio de Castro Lima, J., Paraguassú, A.B. Linear thermal expansion of granitic rocks: influence of apparent porosity, grain size and quartz content. Bull Eng Geol Environ 63, 215–220 (2004). https://doi.org/10.1007/s10064-004-0233-x
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DOI: https://doi.org/10.1007/s10064-004-0233-x