Mechanical and hydraulic properties of block joints of buffer (II)

Chijimatsu, Masakazu*; Sugita, Yutaka; Kikuchi, Hirohito*; *; *; Saito, Toshiaki*

JNC TN8400 99-036, 86 Pages, 1999/09

JNC-TN8400-99-036.pdf:7.47MB

As an engineered barrier system in the geological disposal of high-level waste, multibarrier system is considered. Multibarrier system consists of the vitrified waste, the overpack and the buffer. Bentonite is one of the potential material as the buffer because of its low water permeability, self-sealing properties, radionuclides adsorption and retardation properties, thermal conductivity, chemical buffering properties, overpack supporting properties, stress buffering properties, etc. As the construction technology of the buffer, the block installation method and in-situ compaction method, etc, are being investigated. The block installation method is to emplace the buffer blocks manufactured in advance at the ground facility, and construction processes of the block installation method at the underground will be simplified compared with the in-situ compaction method. However, the block joints of buffer might be a mechanical weak portion or might be a preferential flow channel. Therefore, it is necessary to evaluate the effect of the block joint of buffer. On the other hand, the in-situ compaction method is to introduce the buffer material with specified water content into the disposal tunnel and to make the buffer with high density at the site using a compaction machine. In regard to the in-situ compaction method, it is impossible to construct the buffer at one time, the construction joints will be exist. In order to evaluate the effect of block joints, the box shear test was conducted for mechanical properties, and the infiltration test and permeability test were conducted for hydraulic properties. As the sample of in-situ compaction method, the buffer that was recovered from the Kamaishi In-situ THM Experiment Site was used. Furthermore, the shear properties between the buffer and rock was obtained. The results obtained in this investigation are as follows, (1) The strength of the specimen at 50% saturation is higher than that of the specimen at 100% ...

Effects of -irradiation on mixtures of DNA and bovine serum albumin

Saito, Hiroyuki*; Furusawa, Kazuya*; Dobashi, Toshiaki*; Nagasawa, Naotsugu

no journal, , 

Halogenated aromatic compounds, such as dioxin and polychlorinated biphenyl, result in cancer and reproductive anomaly through intercalation into the major grooves and interstices between base pairs of double helical DNA. Water-insoluble DNA-based materials can be utilized as the most efficient adsorbents of such toxic agents. In this study, we have successfully prepared DNA-bovine serum albumin (BSA) hybrid gels from aqueous mixtures of DNA with BSA by -ray irradiation. We have characterized the gel property and adsorption property of DNA-BSA hybrid gels. The interesting result that mixing -ray-scission polymers of DNA and BSA changes them to be -ray-crosslinking materials is discussed.

Synthesis of bovine serum albumin / DNA gel by rays irradiation and its charactarization

Saito, Hiroyuki; Furusawa, Kazuya*; Nagasawa, Naotsugu; Tamada, Masao; Dobashi, Toshiaki*

no journal, , 

no abstracts in English

Preparation and characterization of DNA-BSA hybrid hydrogels using -rays irradiation

Saito, Hiroyuki*; Dobashi, Toshiaki*; Furusawa, Kazuya*; Nagasawa, Naotsugu; Tamada, Masao

no journal, , 

no abstracts in English