Evaluation of synchrotron X-ray computerized microtomography for the visualization of transport processes in low-porosity materials

被引:18
作者
Altman, SJ
Peplinski, WJ
Rivers, ML
机构
[1] Sandia Natl Labs, Geohydrol Dept, Albuquerque, NM 87185 USA
[2] Univ Chicago, CARS, Chicago, IL 60637 USA
关键词
computerized microtomography; X-ray attenuation; crystalline rock; pore space; contaminant transport; synchrotron radiation; visualization;
D O I
10.1016/j.jconhyd.2005.05.004
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Synchrotron-source X-ray computerized microtomography (CMT) is evaluated as a method to visualize transport processes. We conclude that CMT is adequate for visualization of transport experiments if the right conditions exist. Namely, 1) not much more than one-order-of-magnitude range in concentration data is needed for the study, 2) the pore space in the samples are greater than approximately 2-50 mu m, depending on the sample size and system setup; 3) the sample is fine-grained enough so that a representative elemental volume (REV) can be contained by a 2-10 mm diameter sample, and 4) the transport process is slow enough that significant changes do not occur within the 25-50 min (and possibly less in the future) needed to collect data for one three-dimensional image. Absorption edge difference imaging (AEDI) in association with CMT is introduced as a method to enhance pore-space visualization. We successfully imaged the pore space in a low-porosity granodiodte, diorite and fine-grained granite cores and a higher-porosity soil aggregate sample. We found that the pore space important to transport in the core samples was smaller than what we were able to visualize with CMT. We also made rudimentary associations of minerals with pore-space location. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:167 / 183
页数:17
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