Hydrophobic
Cement
http://ajw.asahi.com/article/0311disaster/fukushima/AJ201411220029
The Asahi Shimbun | AJW Asia and Japan Watch
November 22, 2014
After
failures, TEPCO to use special cement to prevent
contaminated water leaks
by Tsuyoshi Nagano & Hiromi Kumai
by Tsuyoshi Nagano & Hiromi Kumai
The operator of the crippled Fukushima nuclear plant plans to fill in trenches on the coastline in yet another attempt to prevent highly contaminated water from pouring into the sea.
Under the plan, approved by the Nuclear Regulation Authority on Nov. 21, Tokyo Electric Power Co. will inject a special cement mixture into the seaside trenches of the No. 2 and No. 3 reactors while pumping up radioactive water accumulating in them.
The special mixture does not absorb water so it can spread more easily along the bottom of the trenches, displacing the tainted water.
The new method will allow radioactive materials to remain in the surrounding soil, but TEPCO decided to employ the technique because it puts high priority on preventing massive amounts of highly contaminated water from leaking into the ocean.
This spring, TEPCO tried to stop the water influx at the trench for the No. 2 reactor by freezing the junction of the turbine building and the trench, but the operation was tough-going.
The company then attempted to stop the water inflow with a cement mixture, but was unable to do so completely.
Patents
METHOD FOR CONSTRUCTING SEMI-BASEMENT STRUCTURE FOR RADIOACTIVE WASTE
KR101399295
The present invention relates to a method for constructing a semi-basement for storing radioactive waste and, more particularly, to a method for constructing a semi-basement for storing radioactive waste, capable of performing an impervious construction and preventing the diffusion of radioactive materials by installing hydrophobic limestone powder, a radiation shielding sheet, and a waterproof panel between the ground and a wall while constructing an upper structure on the ground after constructing the wall and base of a silo under the ground by excavating the ground. Also, the structure is applied to a base rock, a soft ground, a sand ground, and a subterranean water ground. An impact buffering space part is separated from the wall installed under the ground with a preset distance. An earthquake-proof structure is designed and the diffusion of the radiation is prevented in an emergency situation by filling the impact buffering space part with cement mortar and curing the cement mortar with the impact buffering materials in the emergency situation when the impact buffering space part is filled with impact buffering materials.
PROCESS FOR RADIATION-CHEMICAL DECREASING OF WATER ABSORPTION OF CEMENT BRICK
UA92880
The invention relates to building, namely to the development of a process for radiation-chemical improving of performance characteristics of building materials based on cement brick. The process comprises penetration treatment of cement brick by the mixture of organosilicon monomer - vinylheptamethylcyclotetrasiloxane and polymethylsiloxane liquid with their further copolymerization in concrete volume under action of accelerated electrons. The process provides the increasing of hydrophobic and strength properties of cement brick.
PLUGGING FLUID AND PROCESS FOR PLUGGING A ZONE OF A SUBTERRANEAN FORMATION USING THIS FLUID
WO2013092818
Plugging fluid for plugging a zone of a subterranean formation adjacent to a drill hole, especially an oil drill hole, said fluid consisting of a hydrophobic liquid containing a solid silicate or a solid metasilicate, a clay, and a hydraulic cement. Process for plugging a zone of a subterranean formation adjacent to a drill hole, in which said plugging fluid is transported up to said zone while avoiding any contact with water, and in said zone the plugging fluid is brought into contact with an aqueous solution containing cations chosen from alkali metal cations and alkaline-earth metal cations, by means of which a flash setting of the plugging fluid occurs. The process makes it possible to seal the zones of loss of circulation, to permanently isolate zones of a subterranean formation adjacent to a well, surrounding a well, and to put an end to transverse flows. It also makes it possible to block or close up the drilling wells that must be abandoned.
METHOD OF SOLIDIFYING RADIOACTIVE WASTE
JPH0484800
PURPOSE:To obtain a sound solidified body with high waterproof by performing solidification after the operation for painting the hydrophobic substance in a solidification vessel is performed. CONSTITUTION:After the moisture of waste resin is adjusted from a waste resin tank 1 through a dehydrater 2, it is introduced into a kneading tank 6 with a mixer 7. In a solidification system, a specified quantity of cement from a cement silo 3 is introduced into the kneading tank 6, a specified quantity of water from a kneading water tank 4 is put therein and a specified quantity of a water reducing agent and the like from an addition agent hopper 5 is introduced therein. A solidification vessel 11, for instance, is previously treated in a hydrophobic compound tank in which silicone grease of a low coefficient of viscosity and the like and mixture of grease are put. The previous disposal is performed by painting on the inner wall face of the tank 11 through spray drive power 9 and a spray nozzle 10. After the painting for about 30 minutes the vessel 11 is carried to the lower part of the kneading tank 6, radioactive waste resin homogeneously kneaded is charged therein from the kneading tank 6 to form a solidified body 12.
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