GUNMA UNIVERSITY
Gunma, JP
GUNMA UNIVERSITY Patent applications | ||
Patent application number | Title | Published |
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20140034875 | WATER-BLOCKING FILLER AND FILLER FOR MANMADE MULTI-BARRIERS USING SAID WATER-BLOCKING FILLER - Provided are a water-blocking filler, the swelling properties of which do not decrease easily even when in contact with water containing calcium ions, and a filler for engineered multi-barriers with said water-blocking filler as the engineered multi-barrier filler. A water-blocking filler mainly comprising sodium bentonite obtained by mixing 30 weight % or less, in terms of inner percentage, of a pozzolan substance such as fly ash or silica fume with said bentonite, and a filler using said water-blocking filler that is used for engineered multi-barriers in radioactive waste disposal facilities. | 02-06-2014 |
20110097155 | ARTIFICIAL MULTI-BARRIER FOR A RADIOACTIVE WASTE TREATMENT FACILITY - A concrete pit containing radioactive waste is surrounded by a low diffusion layer of cement-based material, which in turn, is surrounded by a low water permeability layer of sodium-type bentonite and the leaching out of calcium ions from the low water permeability layer is inhibited by mixing sodium bicarbonate or sodium carbonate with the sodium-type bentonite/sand mixture of the low water-permeability layer so that leached calcium ions form a barrier layer having calcium carbonate as the main component in the vicinity of the interface between the layers. | 04-28-2011 |