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Kobayashi, Kensuke*; Yasue, Ayumu*; Morooka, Satoshi; Kanematsu, Manabu*
Konkurito Kogaku Nenji Rombunshu (DVD-ROM), 44(1), p.208 - 213, 2022/07
no abstracts in English
Sekine, Mariko*; Suzuki, Hiroshi; Kanematsu, Manabu*
Konkurito Kogaku Nenji Rombunshu (DVD-ROM), 40(1), p.1545 - 1550, 2018/07
no abstracts in English
Ogino, Masataka*; Owaki, Eiji*; Shirase, Mitsuyasu*; Nakayama, Masashi
Konkurito Kogaku Nenji Rombunshu (DVD-ROM), 39(1), p.703 - 708, 2017/07
no abstracts in English
Takeda, Nobufumi*; Kuwae, Hitomi*; Nakayama, Masashi; Kobayashi, Yasushi
Konkurito Kogaku Nenji Rombunshu (DVD-ROM), 31(1), p.895 - 900, 2009/07
High level radioactive waste repository will be constructed using a variety of concrete such as shotcrete, lining for rock support. It is anticipated that highly alkaline plume released from the cement hydrates could influence the long-term performance of barrier system as a result of degradation of the buffer material and rock. In order to reduce hyper alkaline, JAEA is now undertaking development of low alkaline cement (HFSC: Highly Fly ash contained Silicafume Cement). In this report, to evaluate corrosion behavior of reinforcement in HFSC, we have conducted exposure test using reinforced concrete specimens in off-shore condition for 6 years, investigated corrosion rate and permeation chloride ion in concrete. As the result, it is evaluated that the period until crack occurred is more than 30 years in case of using HFSC concrete.
Kanematsu, Manabu*; Noguchi, Takafumi*; Maruyama, Ippei*; Iikura, Hiroshi
Konkurito Kogaku Nenji Rombunshu (DVD-ROM), 29(1), p.981 - 986, 2007/00
Neutron radiography is one of the non-destructive methods. In this research, neutron radiography was applied to visualize and quantify the water penetration into concrete through cracks. The radiographs were obtained by the TNRF (Thermal Neutron Radiography Facility) installed at a research reactor, JRR-3M, in the Japan Atomic Energy Agency (JAEA). The quantitative capability of neutron radiography for the water content and the penetration depth in cement paste specimen were confirmed. The effects of crack and water content on the velocity and the depth of water penetration into concrete were visualized with several concrete specimens, to which surface water was supplied through the container.
from EPMA and pore struacture of hardened cement pasteMihara, Morihiro; Matsumura, Masamitsu*; Nagasaka, Akiro*; Torii, Kazuyuki*
Konkurito Kogaku Nenji Rombunshu (DVD-ROM), 29(1), p.1023 - 1028, 2007/00
Apppearant diffusion coefficients of Cl in hardend cement pastes were obtained using EPMA.
Iriya, Keishiro*; Nakayama, Masashi; Konishi, Kazuhiro; Mihara, Morihiro
Konkurito Kogaku Nenji Rombunshu (DVD-ROM), 28(1), p.173 - 178, 2006/00
no abstracts in English
Orukawa, Go; Kojima, Wataru; Shirato, Nobuaki*; Saito, Toshiki*
Konkurito Kogaku Nenji Rombunshu (DVD-ROM), 28(1), p.1637 - 1642, 2006/00
no abstracts in English
Iha, Akane*; Matsubara, Hitoshi; Iraha, Shigeo*; Kanda, Yasuyuki*
Konkurito Kogaku Nenji Rombunshu (DVD-ROM), 27(2), p.1663 - 1668, 2005/00
The concrete structures such a reactor building are able to resist external forces by interaction behavior such as concrete, reinforcements, steel frames and the foundation. Therefore, it is a very important subject to solve analytically the displacement behavior and the stress distribution because the safety of structures and safe security can be offered by it. In general, such a problem is solved by using the beam theory. However, it is impossible to evaluate the different behavior or stress distribution on every component. In this paper, 3-dimensional finite element analysis of full-scale anchor wall is performed. In addition, all composition material is taken into consideration in this analysis. Consequently, concrete interaction behavior with many components is solved, and the displacement behavior and concentration of stress also is elucidated.