POre Space Investigation in Natural and Artificial Materials

Projekti: Tutkimusprojekti

Projektin yksityiskohdat

Kuvaus (abstrakti)

The objective of the research programme is to produce realistic 3D models of natural and artificial materials including porosity distribution. This will lead to integrating techniques characterizing 3D pore network in natural and artificial materials such as, rocks (granite, clay rocks, etc.), soils, cements, graphite and so on, in order to understand how porosity distribution is related to mineral species in natural or artificial materials and what the relationship is between mineral species distribution and diffusion accessible porosity.
This program aims to associate skills regarding the following:
·To improve knowledge of petrography on rocks, cements and soils, etc… related to porosity organisation (HYDRASA, Poitiers, France).
·To characterise heterogeneous spatial porosities of these materials using a saturation technique with a 14C- or 3H PolyMethylMethAcrylate (PMMA) resin (HYRL, Helsinki, Finlande).
·To provide service for industries which need 3D models of their materials (SME ERM, Poitiers, France).
Radioactive resin saturation combined with autoradiograph acquisition and image processing remains a unique manner to produce a quantitative porosity mapping which integrates all the pores whatever their size.
Since 1979, there was a scientific programme (7-10 scientists) focusing on the problems of nuclear waste management mainly in the field of the geological repository. The migration, sorption and rock matrix characterisation has been the main field of study since the beginning of the 1990’s. The PMMA method development was performed in collaboration with the Finnish Nuclear Safety Authority. Since 1995, the widely used application of the PMMA method has been the excavation damage zone characterisation in low permeable media. The work was ordered by the end-users such as Posiva and SKB, organisations responsible for the final disposal of spent nuclear fuel respectively in Finland and in Sweden.
Rock matrix characterisation has also been a research topic of interest for the end-users to evaluate radionuclide migration from the repository to the biosphere. Therefore, the PMMA method has been developed for more than ten years to characterise pore space geometry concerning low permeable granitic rocks. 14C-labelled methylmethacrylate saturation and autoradiography allows pattern analysis of spatial porosity distribution as well as quantitative measurement of specific mineral and local porosities. The quantitative petrography methods developed by the University of Poitiers (HYDRASA) provide in combination with the PMMA method, quantitative information on rock properties. Consequently the coupling of knowledge on petrography and PMMA method is able to provide a fundamental progress for the understanding of porous materials. This idea of the POSINAM project has been developed by the SME called ERM due to the demands to characterise porosity of clay rocks/cement originating from large industrial companies such as TOTAL or LAFARGE. These demands consist of research applications that will be based on the enhancement of the knowledge on altered natural rocks or materials (Poitiers) as well as, saturation techniques for characterising the porosity of these materials (Helsinki).
TilaPäättynyt
Todellinen alku/loppupvm15/10/200901/01/2015

Rahoitus

  • Unknown funder: 198 808,00 €

Tieteenalat

  • 116 Kemia
  • 119 Muut luonnontieteet