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Hagiwara, Shigeru*; Sakamoto, Yoshiaki*; Takebe, Shinichi; Nakayama, Shinichi
JAERI-Data/Code 2004-004, 167 Pages, 2004/03
JAERI-Data-Code-2004-004.pdf:10.14MB
no abstracts in English
Yabana, Shuichi*; Matsuda, Akihiro*; Nakahira, Masataka; Osaki, Toshio*
Nihon Kenchiku Gakkai 2002-Nendo Taikai Koen Kogaishu, P. 495, 2002/08
no abstracts in English
*; Tanai, Kenji; *
JNC TN8420 2001-007, 86 Pages, 2002/02
JNC-TN8420-2001-007.pdf:6.04MB
The objectives of this study is to identify the research issues, which are to be conducted in the future underground research laboratory, about operation and logistics systems for the planning of future research and development program. The research programs and experiments,etc. were investigated for the geological disposal projects in overseas sedimentary rocks and coastal geological environments aiming to reflect in the future underground research facility plan in Japan. In the investigation, information on the engineered-barrier performance, design and construction of underground facilities, tunnel support, transportation and emplacement, and backfilling technology, etc. were collected. Based on these informations, the purpose, the content, and the result of each investigations and tests were arranged. The strategy and the aim in the entire underground research facility, and the flow of investigations and tests, etc. were also arranged from the purpose, the relations and the sequence of each investigation and experiment, and the usage of results, etc.
Futakawa, Masatoshi; Wakui, Takashi*; Ioka, Ikuo; Eto, Motokuni
Journal of the European Ceramic Society, 20(8), p.1135 - 1143, 2000/05
Times Cited Count：5 Percentile：44.86(Materials Science, Ceramics)no abstracts in English
Savage, D.*; Lemke, K.*; Sasamoto, Hiroshi; Shibata, Masahiro; Arthur, R. C,*; Yui, Mikazu
JNC TN8400 2000-004, 30 Pages, 2000/01
JNC-TN8400-2000-004.pdf:1.26MB
Modeling approaches that have been proposed for cement-water system are reviewed in this report, and relevant supporting thsrmodynamic data are compiled. The thermodynamic data include standard molal thermodynamic properties of minerals and related compounds comprising cements, and equilibrium constants for associated hydrolysis reactions. Similar data for minerals that are stable in hyperalkaline geologic environments (e.g., zeolites) are also included because these minerals could be formed as hyperalkaline fluids emanating from cementitious matelials in a repository for radioactive wastes interact with the surrounding host rock. Standard molal properties (i.e., standard molal Gibbs free energies and enthalpies of formation and standard molal entropies), and/or equilibrium constants for associated hydrolysis reactions, are included for. (1)cement minerals and related compounds (Reardon, 1992; Glasser et al., 1999) (2)calcium-silicate hydrate minerals (Sarkar et al., 1982), and (3)zeolites (calorimetric and estimated values from various sources) All these data are accepted at face value, and it is therefore cautioned that the data, considered as a whole, may not be internally consistent. It is also important to note that the accuracy of these data have not been evaluated in the present study. Several models appropriate for cement-water systems have been proposed in recent years. Most are similar in the sense that they represent empirical fits to laboratory data for the CSH gel-water system, and therefore not thermodynamically defensible. An alternative modeling approach based on thermodynamic principles of solid-solution behavior appropriate for CSH gel has recently been proposed, however. It is reviewed in the present study, and evaluated in relation to experimental results obtained by JNC on cement-water interactions. The solid-solution model is based upon a thermodynamically- and structually-justifiable description of CSH gel in terms of a non-ideal ...
Takachi, Kazuhiko; Taniguchi, Wataru
JNC TN8400 99-042, 68 Pages, 1999/11
The buffer material is expected to maintain its low water permeability, self-sealing properties, radionuclides adsorption and retardation properties, thermal conductivity, chemical buffering properties, overpack supporting properties, stress buffering properties, etc. over a long period of time. Natural clay is mentioned as a material that can relatively satisfy above. Among the kinds of natural clay, bentonite when compacted is superior because (1)it has exceptionally low water permeability and properties to control the movement of water in buffer, (2)it fills void spaces in the buffer and fractures in the host rock as it swells upon water uptake, (3)it has the ability to exchange cations and to adsorb cationic radioelements. In order to confirm these functions for the purpose of safety assessment, it is necessary to evaluate buffer properties through laboratory tests and engineering-scale tests, and to make assessments based on the ranges in the data obtained. This report describes the procedures, test conditions, results and examinations on the buffer material of dynamic triaxial tests, measurement of elastic wave velocity and liquefaction tests that aim at getting hold of dynamic mechanical properties. MWe can get hold of dependency on the shearing strain of the shearing modulus and hysteresis damping constant, the application for the mechanical model etc. by dynamic triaxial tests, the acceptability of maximum shearing modulus obtained from dynamic triaxial tests etc. by measurement of elastic wave velocity and dynamic strength caused by cyclic stress etc. by liquefaction tests.
Oda, Chie; Arthur, R. C,*; Sasamoto, Hiroshi; Shibata, Masahiro; Yui, Mikazu; Neyama, Atsushi*
JNC TN8400 99-079, 287 Pages, 1999/09
Two thermodynamic databases for geochemical calculations supporting research and development on geological disposal concepts for high level radioactive waste are described in this report. One, SPRONS.JNC, is compatible with thermodynamic relations comprising the SUPCRT model and software, which permits calculation of the standard molal and partial molal thermodynamic properties of minerals, gases, aqueous species and reactions from 1 to 5000 bars and 0 to 1000
C. This database includes standard molal Gibbs free energies and enthalpies of formation, standard molal entropies and volumes, and Maier-Kelly heat capacity coefficients at the reference pressure (1 bar) and temperature (25C) for 195 minerals and 16 gases. It also includes standard partial molal Gibbs free energies and enthalpies of formation, standard partial molal entropies, and Helgeson, Kirkham and Flowers (HKF) equation-of-state coefficients at the reference pressure and temperature for 1147 inorganic and organic aqueous ions and complexes. SPRONS.JNC extends similar databases described elsewhere by incorporating new and revised data published in the peer-reviewed literature since 1991. The other database, PHREEQE.JNC, is compatible with the PHREEQE series of geochemical modeling codes. It includes equilibrium constants at 25C and 1 bar for mineral-dissolution, gas-solubility, aqueous-association and oxidation-reduction reactions. Reaction enthalpies, or coefficients in an empirical log K(T) function, are also included in this database, which permits calculation of equilibrium constants between 0 and 100C at 1 bar. All equilibrium constants, reaction enthalpies, and logK(T) coefficients in PHREEQE.JNC are calculated usig SUPCRT and SPRONS.JNC, which ensures that these two databases are mutually consistent. They are also internally consistent insofar as all the data are compatible with basic thermodynamic definitions and functional relations in the SUPCRT ...
*; Udagawa, Akira; Morita, Yosuke
JAERI-Tech 99-012, 15 Pages, 1999/02
no abstracts in English
Sasuga, Tsuneo; Kudo, Hisaaki; Seguchi, Tadao
Polymer, 40, p.5095 - 5102, 1999/00
Times Cited Count：25 Percentile：68.21(Polymer Science)no abstracts in English
Kudo, Hisaaki; Sasuga, Tsuneo; Seguchi, Tadao; Katsumura, Yosuke*
Polymer, 37(16), p.3737 - 3739, 1996/08
Times Cited Count：14 Percentile：53.8(Polymer Science)no abstracts in English
Kudo, Hisaaki
Journal of Materials Science Letters, 15(8), p.666 - 669, 1996/04
Times Cited Count：7 Percentile：39.56(Materials Science, Multidisciplinary)no abstracts in English
Sugimoto, Masaki; Okamura, K.*; Seguchi, Tadao
Material Chemistry 96: Proc. of Int. Symp. on Material Chemistry in Nuclear Environment, 0, p.587 - 593, 1996/00
no abstracts in English
Kudo, Hisaaki; Sasuga, Tsuneo; Seguchi, Tadao
JAERI-Conf 95-003, 0, p.472 - 475, 1995/03
no abstracts in English
Sugimoto, Masaki; Okamura, K.*; Seguchi, Tadao
High-Temperature Ceramic-Matrix Composites II (HT-CMC2), 0, p.293 - 298, 1995/00
no abstracts in English
Tada, Hiroyuki*; Saito, Akira*; Kumasaka, Hiroo*; Osada, Masahiko*; Takemura, Takato*; Maekawa, Keisuke
no journal, ,
no abstracts in English
Suzuki, Keisuke*; Aoki, Hiroyuki
no journal, ,
no abstracts in English
