Skip to main content Accessibility help
×
Home
Hostname: page-component-768dbb666b-t89mg Total loading time: 0.274 Render date: 2023-02-06T21:54:48.802Z Has data issue: true Feature Flags: { "useRatesEcommerce": false } hasContentIssue true

Effect of Calcium Silicate Hydrate Precipitates at Cementitious and Bentonite Material Interface on Long-Term Engineered Barrier System Performance in TRU Waste Disposal Facilities

Published online by Cambridge University Press:  15 February 2011

Susumu Kurosawa
Affiliation:
EBS Technology Research Project, Radioactive Waste Management Funding and Research Center (RWMC), 1-15-7, Tsukishima, Chuo-ku, Tokyo, 104-0052, Japan
Hiroyuki Sakamoto
Affiliation:
Solution Department, Taiheiyo Consultant Co., Ltd., 2-4-2, Ohsaku, Sakura-shi, Chiba, 285-8655, Japan
Kiyofumi Nitta
Affiliation:
Photon Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization (KEK), 1-1, Oho, Tsukuba-shi, Ibaraki, 305-0801, Japan
Chiya Numako
Affiliation:
Faculty of Integrated Arts and Sciences, The University of Tokushima, 1-1, Minami-josanjima, Tokushima, 770-8502, Japan
Kazuko Haga
Affiliation:
Solution Department, Taiheiyo Consultant Co., Ltd., 3-8-5, Misaki-cho, Chiyoda-ku, Tokyo, 101-0061, Japan
Masahito Shibata
Affiliation:
Solution Department, Taiheiyo Consultant Co., Ltd., 2-4-2, Ohsaku, Sakura-shi, Chiba, 285-8655, Japan
Tsutomu Sato
Affiliation:
Laboratory of Enviromental Geology, Graduate School of Engineering, Hokkaido University, Kita 8 Nishi 5, Sapporo, Hokkaido, 060-8628, Japan
Toshiyuki Nakazawa
Affiliation:
Naka Energy Research Laboratory, Mitsubishi Materials Corporation, 1002-14, Mukohyama, Naka-shi, Ibaraki, 311-0102, Japan
Hitoshi Owada
Affiliation:
EBS Technology Research Project, Radioactive Waste Management Funding and Research Center (RWMC), 1-15-7, Tsukishima, Chuo-ku, Tokyo, 104-0052, Japan
Get access

Abstract

Chemical conditions and mass transport properties of engineered barrier systems in TRU waste facilities would change with time due to the interaction of cement/bentonite materials. (‘TRU waste’ is one of categories of the radioactive wastes and contains a significant amount of alpha-emitting transuranic nuclides. In some countries, these wastes are classified into the Intermediate Level Waste (ILW).) Previous numerical model analyses to assess the long-term performance of engineered barrier systems in TRU waste repositories predicted to form Calcium Silicate Hydrate (C-S-H) species at the interface between the cementitious and bentonite materials. If C-S-H precipitates in the bentonite side of the boundary, mass transport in the bentonite buffer decreases and mineralogical alterations are expected to be restricted for a long period. The evidence of C-S-H precipitation in the bentonite side, however, still has not been identified in the former experimental studies. To improve the reliability of numerical analyses, immersion experiments were performed using contact samples of cementitious and bentonite materials, and X-ray absorption fine structure (XAFS) analysis was carried out to detect C-S-H precipitation at the contacting interface. Precipitation of C-S-H was confirmed from the obtained XAFS spectra. This result is one of the evidences to show the validity of the current numerical model analyses, which suggests that the bentonite buffer performance as an engineered barrier would be kept over a long period.

Type
Research Article
Copyright
Copyright © Materials Research Society 2009

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

1 Japan Atomic Energy Agency, The Federation of Electric Power Companies of Japan,“Second Progress Report on Research and Development for TRU Waste Disposal in Japan,” JAEA-Review 2007-010, FEPC TRU-TR2-2007-01, (2007).Google Scholar
2 Yamada, N., Shimoda, S., Asano, H., Owada, H. and Kuno, Y., TOPSEAL 2006 Transactions, (Olkiluoto, Finland, 2006).Google Scholar
3 Taguchi, T., Ozawa, T. and Yashiro, H., Physica Scripta. T115, pp.205206(2005).CrossRefGoogle Scholar
4 Radioactive Waste Management Funding and Research Center,“H18 Report of Project for Verification Tests on the Long-Term Performance of Engineered Barriers,” funded by Ministry of Economy, Trade and Industry of Japan, (2007) (in Japanese).Google Scholar
5 Parkhurst, D. L., Appelo, C. A. J., “User's Guide to PHREEQC (Version 2),” Water-Resources Investigations Report 99-4259, (1999).Google Scholar
6 Arthur, R. C. et al. ,“Development of Thermodynamic Databases for Geochemical Calculations,” JNC Technical report, JNC TN8400 99-079, (1999).Google Scholar
7 Atkinson, A. et al. , “Evolution of pH in a Radwaste Repository: Experimental Simulation of Cement Leaching,” DOE/RW/89/025, (1987).Google Scholar

Save article to Kindle

To save this article to your Kindle, first ensure coreplatform@cambridge.org is added to your Approved Personal Document E-mail List under your Personal Document Settings on the Manage Your Content and Devices page of your Amazon account. Then enter the ‘name’ part of your Kindle email address below. Find out more about saving to your Kindle.

Note you can select to save to either the @free.kindle.com or @kindle.com variations. ‘@free.kindle.com’ emails are free but can only be saved to your device when it is connected to wi-fi. ‘@kindle.com’ emails can be delivered even when you are not connected to wi-fi, but note that service fees apply.

Find out more about the Kindle Personal Document Service.

Effect of Calcium Silicate Hydrate Precipitates at Cementitious and Bentonite Material Interface on Long-Term Engineered Barrier System Performance in TRU Waste Disposal Facilities
Available formats
×

Save article to Dropbox

To save this article to your Dropbox account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Dropbox account. Find out more about saving content to Dropbox.

Effect of Calcium Silicate Hydrate Precipitates at Cementitious and Bentonite Material Interface on Long-Term Engineered Barrier System Performance in TRU Waste Disposal Facilities
Available formats
×

Save article to Google Drive

To save this article to your Google Drive account, please select one or more formats and confirm that you agree to abide by our usage policies. If this is the first time you used this feature, you will be asked to authorise Cambridge Core to connect with your Google Drive account. Find out more about saving content to Google Drive.

Effect of Calcium Silicate Hydrate Precipitates at Cementitious and Bentonite Material Interface on Long-Term Engineered Barrier System Performance in TRU Waste Disposal Facilities
Available formats
×
×

Reply to: Submit a response

Please enter your response.

Your details

Please enter a valid email address.

Conflicting interests

Do you have any conflicting interests? *