Abstract
It is important to have a thorough knowledge of the petrographic characteristics of rocks to evaluate and understand their mechanical behavior. This paper deals with the influence of the texture and the mineral characteristics of nine Portuguese granites employed as dimensional stones. This study evaluates different mineral characteristics, such as mineral deterioration, grain size, quartz fissuration and the contacts between quartz and others mineral groups. The main differences in the studied granites were identified, clarifying the relationship between the petrographic characteristics. The consequences on their respective mechanical behavior were subsequently evaluated. The physical and textural characteristics of quartz in the studied granites have proven to be very important for understanding the behavior of granitic rocks under compressive stress. Uniaxial compressive strength values are not proportional to the quartz–feldspar ratio or quartz content and there is a tendency for strength to decrease with the increase in quartz. This could be related to the increase in quartz-quartz contacts and the decrease in the rock capacity for accommodating the deformation.
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Acknowledgments
This study was supported by Centro de Geociências da Universidade de Coimbra, with funds from the FCT-Fundação para a Ciência e a Tecnologia. The author is grateful to the anonymous reviewers for their suggestions and constructive comments.
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Sousa, L.M.O. The influence of the characteristics of quartz and mineral deterioration on the strength of granitic dimensional stones. Environ Earth Sci 69, 1333–1346 (2013). https://doi.org/10.1007/s12665-012-2036-x
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DOI: https://doi.org/10.1007/s12665-012-2036-x