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Porosity changes in a granite close to quarry faces: identification from 14C-PMMA autoradiographs and mineralogical cartographies

Published online by Cambridge University Press:  29 November 2002

R. Robert ,
P. Sardini ,
Sammartino ,
C. Dubois ,
L. Guillot ,
M. Rossy ,
P. Gaviglio  and
M. Siitari-Kauppi
R. Robert
Affiliation:
EA 473 “Microanalyse des Matériaux” LRC-CEA (M07), Université de Franche-Comté, 25000 Besançon, France
P. Sardini
Affiliation:
Laboratoire HYDR'ASA, UMR 6532 CNRS, Université de Poitiers, France
Sammartino
Affiliation:
ERM Sarl, 86022 Poitiers, France
C. Dubois*
Affiliation:
EA 473 “Microanalyse des Matériaux” LRC-CEA (M07), Université de Franche-Comté, 25000 Besançon, France
L. Guillot
Affiliation:
EA 473 “Microanalyse des Matériaux” LRC-CEA (M07), Université de Franche-Comté, 25000 Besançon, France
M. Rossy
Affiliation:
EA 2642 Géosciences, Université de Franche-Comté, 25000 Besançon, France
P. Gaviglio
Affiliation:
EA 2642 Géosciences, Université de Franche-Comté, 25000 Besançon, France
M. Siitari-Kauppi
Affiliation:
Department of Chemistry, Laboratory of Radiochemistry, University of Helsinki, Finland
*
claude.dubois@univ-fcomte.fr
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Abstract

In a previous study, the porosity of the “Granite des Crêtes” was quantified by 14C-MMA porosimetry. Autoradiographs of the granite close to quarry faces, freshly quarried (A) or weathered for 20 years (B), show an increase in porosity of B in comparison with A, localized in intragranular microcracks and grain joints and in millimetric grain zones [1]. In this study, mineralogical cartography-autoradiograph overlaps led to the identification of the alterated millimetric minerals of B, in which the porosity was higher. Moreover, the SEM analysis led to the quantification of an increase in porosity linked to an enlargement of the intragranular microcracks and the grain joints.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 21 , Issue 2 , February 2003 , pp. 127 - 136
Copyright
© EDP Sciences, 2003

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References

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