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Evaluation of Porosity and Its Variation in Porous Materials Using Microfocus X-ray Computed Tomography Considering the Partial Volume Effect

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Title: Evaluation of Porosity and Its Variation in Porous Materials Using Microfocus X-ray Computed Tomography Considering the Partial Volume Effect
Authors: Kato, Masaji Browse this author →KAKEN DB
Takahashi, Manabu Browse this author →KAKEN DB
Kawasaki, Satoru Browse this author →KAKEN DB
Mukunoki, Toshifumi Browse this author →KAKEN DB
Kaneko, Katsuhiko Browse this author →KAKEN DB
Keywords: porous material
X-ray CT
partial volume effect
image segmentation
histogram-based thresholding
maximum likelihood criteria 
packed glass beads
Issue Date: 2013
Publisher: The Mining and Materials Processing Institute of Japan
Volume: 54
Issue: 9
Start Page: 1678
End Page: 1685
Publisher DOI: 10.2320/matertrans.M-M2013813
Abstract: The physical properties of two-phase materials depend on their internal structure. Therefore, segmentation of the structure of such materials is important in material sciences. In this study, we used a maximum likelihood thresholding method that considered the partial volume effect —i.e., the effect of mixels (mixed pixels)— to calculate the porosities of packed glass beads and the Berea sandstone using microfocus X-ray computed tomography (CT) images. We also examined the effects of scanning conditions on the segmentation results and assessed the porosity of possible packing structures of the glass beads to be segmented to be 33–37% based on histogram data. Moreover, we evaluated the porosity of the Berea sandstone to be 18%. Then, we examined variation in the porosity of biogrouted packing of glass beads using a microfocus X-ray CT scanner and histogram-based image analysis with the same thresholding method. Our results indicated that the ratio of grouted to ungrouted geomaterial porosities was 0.98, whereas the value estimated by measuring changes in the concentration of calcium ions was 0.98–0.99. Thus, we have confirmed that the proposed method can evaluate small changes in porosity with high accuracy.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 加藤 昌治

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