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Porosity changes in a granite close to quarry faces: quantification and distribution by 14C-MMA and Hg porosimetries

Published online by Cambridge University Press:  15 February 2000

L. Guillot ,
M. Siitari-Kauppi ,
K-H. Hellmuth ,
C. Dubois ,
M. Rossy  and
P. Gaviglio
L. Guillot
Affiliation:
Laboratoire de Microanalyses Nucléaires, Université de Franche-Comté, France Département de Géosciences, Université de Franche-Comté, France
M. Siitari-Kauppi
Affiliation:
Department of Chemistry, Laboratory of Radiochemistry, University of Helsinki, Finland
K-H. Hellmuth
Affiliation:
Finnish Center for Radiation and Nuclear Safety, Helsinki, Finland
C. Dubois*
Affiliation:
Laboratoire de Microanalyses Nucléaires, Université de Franche-Comté, France
M. Rossy
Affiliation:
Département de Géosciences, Université de Franche-Comté, France
P. Gaviglio
Affiliation:
Département de Géosciences, Université de Franche-Comté, France
*
[email protected]
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Abstract

The microcrack distribution in a low porous granite exposed to weathering after quarrying was investigated in order to detect its microstructural evolution. Two blocks (A and B) were taken in the same granite body from two quarry faces respectively exposed during a few weeks and twenty years. Porosimetry by injection of carbon-14-methylmethacrylate (14C-MMA) was used for analysing the porous medium. Measurements of optical densities of autoradiographs provided data for the localization and the quantification of porosity. Results are compared with those obtained by mercury porosimetry. Average porosity of sample A was found to be 0.37 ± 0.03% whereas average porosity in sample B reaches 1.07 ± 0.45%. Most of the porosity increase may be explained by the opening of grain boundaries.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 9 , Issue 2 , February 2000 , pp. 137 - 146
Copyright
© EDP Sciences, 2000

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