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Toida, Masaru*; Sasakura, Takeshi*; Yokozeki, Kosuke*; Kobayashi, Ichizo*; Watanabe, Kenzo*; Ashizawa, Ryoichi*
JNC TJ8400 2004-036, 310 Pages, 2005/03
JNC-TJ8400-2004-036.pdf:3.76MB
To integrate the system for evaluation of long-term hydraulic condition in near field of TRU waste disposal, the engineered barrier, which consists of bentonite buffer and cementitious materials, was employed in the series of laboratory tests. On the bentonite buffer, with the aim of investigating of the effect of (i)interlayer cation in bentonite, (ii)content of siliceous sand and (iii)the ionic strength of ground water on its mechanical and hydraulic properties, series of laboratory tests were conducted. The same lot of bentonite was used in the series of tests to obtain consistent data. In addition, the swelling test of the laminated bentonite with caliumization front was conducted for verification of the proposed constitutive model. On cementitious materials, the altered specimen that produced immersing was investigated the water permeation and also characteristics. The hardened cement paste specimens with W/C=40 to 105% were immersed into deionized water and alteration behavior under diffusion condition was investigated.
Takei, Akihiko*; Owada, Hitoshi*; Fujita, Hideki*; Negishi, Kumi*; Hibiya, Keisuke*; Yokozeki, Kosuke*; Watanabe, Kenzo*
JNC TJ8400 2003-047, 120 Pages, 2003/02
JNC-TJ8400-2003-047.pdf:4.46MB
We acquired the water permeation properties and also mechanical characteristics of the altered specimen that produced by permeation or immersing as the fundamental data.
Takei, Akihiko*; Owada, Hitoshi*; Fujita, Hideki*; Negishi, Kumi*; Hibiya, Keisuke*; Yokozeki, Kosuke*; Watanabe, Kenzo*
JNC TJ8400 2003-046, 282 Pages, 2003/02
JNC-TJ8400-2003-046.pdf:8.26MB
We acquired the water permeation properties and also mechanical characteristics of the altered specimen that produced by permeation or immersing as the fundamental data.
*; Owada, Hitoshi*; Fujita, Hideki*; *; *; Yokozeki, Kosuke*; *
JNC TJ8400 2002-029, 79 Pages, 2002/02
JNC-TJ8400-2002-029.pdf:1.58MB
We acquired the water permeation properties and also mechanical characteristics of the altered specimen that produced by permeation or leaching as the fundamental data for the evaluation in "Study on the system development for evaluating long-term alteration of hydraulic field in Near Field" that had been carried out separately. The results in this year are shown below. (1)Hardened cement paste specimens with W/C=85% and 105% were altered and characterized after permeation. Permeability of altered part was increased, as permeated water increased. Porosity was increased at the upper part of altered specimens, and compressive strength that means the properties from altered part of specimens were decreased after water-permeation. Adequate correlations are estimated between compressive strength and porosity, permeability, Vickers hardness. From the chemical properties, it is presumed these physical changes were caused by dissolution of portlandite. (2)Hardened cement paste specimens with W/C=40 to 105% were immersed into deionized water and alteration behavior under diffusion condition was investigated. As a result, after 12 weeks, porosity was increasing and Vickers hardness was decreasing at the altered area. And the water permeability and the compressive strength at the deteriorated area were simulated from relations between water permeability, compressive strength, porosity, Vickers hardness and leaching ratio of calcium. These results suggest that two methods (permeation and leaching) make up for fault of each other. It is necessary to prepare additional data, to clarify the relations between each alteration factor.
*; Owada, Hitoshi*; Fujita, Hideki*; *; *; Yokozeki, Kosuke*; *
JNC TJ8400 2002-028, 218 Pages, 2002/02
We acquired the water permeation properties and also mechanical characteristics of the altered specimen that produced by permeation or leaching as the fundamental data for the evaluation in "Study on the system development for evaluating long-term alteration of hydraulic field in Near Field" that had been carried out separately. The results in this year are shown below. (1)Hardened cement paste specimens with W/C=85% and 105% were altered and characterized after permeation. Permeability of altered part was increased, as permeated water increased. Porosity was increased at the upper part of altered specimens, and compressive strength that means the properties from altered part of specimens were decreased after water-permeation. Adequate correlations are estimated between compressive strength and porosity, permeability, Vickers hardness. From the chemical properties, it is presumed these physical changes were caused by dissolution of portlandite. (2)Hardened cement paste specimens with W/C=40 to 105% were immersed into deionized water and alteration behavior under diffusion condition was investigated. As a result, after 12 weeks, porosity was increasing and Vickers hardness was decreasing at the altered area. And the water permeability and the compressive strength at the deteriorated area were simulated from relations between water permeability, compressive strength, porosity, Vickers hardness and leaching ratio of calcium. These results suggest that two methods (permeation and leaching) make up for fault of each other. It is necessary to prepare additional data, to clarify the relations between each alteration factor.