Study on construction method of concrete in the underground research laboratory (IV)

Iriya, Keishiro*; Tajima, Takatoshi*; Noda, Masaru*

JNC TJ5400 2003-008, 150 Pages, 2004/02

JNC-TJ5400-2003-008.pdf:21.54MB

In situ experiment on the low alkalinity cement is planned in construction of Horonobe Underground Research Center. This will be carried out in a part of the vertical shafts and horizontal experimental tunnels. The problems for actual using should be solved and improved until starting construction. This study has been carried out in order to improve the HFSC taking the Horonobe environment into account. Model analysis and preliminary laboratory experiment on hyper alkaline alteration of bentonite and rock have been carried out. And long term permeability experiment on this alteration was planed. pH decreasing ratio of HFSC is predicted by pH measuring for 1.5 year and geo-chemical code. Open data and undefined reaction were pointed out in order to accomplish the model on low alkalinity cement with high pozollanic content. The effects on fresh concrete properties and harden concrete due to changing properties of fly ash were investigated. Experimental basic planning on Horonobe low alkalinity in situ test are proposed. And finnaly, procedure of improvement HFSC in Horonobe construction are investigated and proposed.

Applicability of Low Alkalinity Cement for Construction and Alteration of Bentonite in the Cement (II)

Iriya, Keishiro*; Fujii, Kensuke*; Tajima, Takatoshi*; Takeda, Nobufumi*; Kubo, Hiroshi*

JNC TJ8400 2003-062, 110 Pages, 2003/02

JNC-TJ8400-2003-062.pdf:5.12MB

In this study, applicability of low alkalinity cement and alteration of bentonite in the cement ere investigated.

Effects of alkaline and nitrate fluids on hydraulic conductivities of compacted bentonite, 2

Shimmura, Akira*; Tajima, Takatoshi*; Kubo, Hiroshi*; Mihara, Morihiro

no journal, , 

no abstracts in English

Hydraulic properties of compacted bentonite under high alkaline and nitrate fluids

Tajima, Takatoshi*; Shimmura, Akira*; Mihara, Morihiro

no journal, , 

no abstracts in English