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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

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 : Hydrophobic Cement
Yo ! Tepco ! Read This :

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.

& More ...

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PROCESS FOR RADIATION-CHEMICAL HYDROPHOBIZATION OF CEMENT BRICK
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ENHANCERS OF THE ADHESION STRENGTH IN CEMENT COMPOSITIONS
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HYDROPHOBIC CEMENTITIOUS COMPOSITION.
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HIGH-EARLY STRENGTHENING CONCRETE COMPOSITE CONTAINING HYDROPHOBIC POLYMER AND REPAIRING METHOD OF CONCRETE STRUCTURE USING THE COMPOSITE
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RAPID SETTING CONCRETE COMPOSITE CONTAINING HYDROPHOBIC EMULSION AND REPAIRING METHOD OF CONCRETE STRUCTURE USING THE COMPOSITE
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Process for preparing hydrophobically modified low foaming copolymers, as cement additives
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Granulated hydrophobic additive for cementitous materials
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METHOD OF ERECTING WALL STRUCTURES IN MINE WORKINGS
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WATER-REPELLENT CEMENT AND SOILS
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Water resistant building materials
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WATER RESISTANT BUILDING MATERIALS
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METHOD OF PREPARING HYDROPHOBIC PLUGGING PORTLAND-CEMENT
SU1016487

METHOD OF OBTAINING PLASTICIZED OR HYDROPHOBIC CEMENT AND DEVICE FOR OBTAINING SAME
SU640983

WATERPROOFING ADDITIVE FOR CEMENT AND CONCRETE COMPRISING MODIFIED POZZOLANIC MATERIALS
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HYDROPHOBIC CEMENT MANUFACTURE PROCESS
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COLOURED HYDROPHOBIC MORTAR
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MORTAR COMPOSITION FOR PREVENTION OF DEW CONDENSATION, COMPRISING HYDROPHOBIC POWDER
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Cement admixture and cement composition
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METHOD OF MANUFACTURE FOR PORTLAND CEMENT OF WATERPROOF
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NON-SEGREGATE CONCRETE IN WATER
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ADDITIVE FOR HYDRAULIC COMPOSITION
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HYDROPHOBIC FLOCCULANT
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PRODUCTION OF CONCRETE WHICH IS MADE HYDROPHOBIC IN BLOCK STATE
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CEMENT ADDITIVE
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METHOD FOR INHIBITING HYDRATION REACTION OF CEMENT BY COATING
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CEMENT ADMIXTURE
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INORGANIC HARDENED BODY
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CEMENT ADMIXTURE AND CEMENT COMPOSITION CONTAINING THE SAME
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POLYMER CEMENT COMPOSITION
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ADMIXTURE FOR CEMENT CONCRETE AND MORTAR USING HIGH-WATER-ABSORPTION RESIN
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WATER-REDUCING AGENT FOR CEMENT
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CEMENT ADMIXTURE AND CEMENT COMPOSITION
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HIGH-STRENGTH HYDRAULIC SUBSTANCE
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CURING METHOD OF CONCRETE
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HYDRAULIC COMPOSITION
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THICKENER FOR UNDERWATER CONCRETE
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GLASS IONOMER CEMENT-HARDENING LIQUID
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METHOD OF FORMING A HYDROPHOBIC SURFACE
GB1490229

RENDERING BUILDING MATERIALS HYDROPHOBIC
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HYDROPHOBIC CEMENTITIOUS AND/OR CALCIFEROUS COMPOSITIONS
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WATER REPELLANT METALS AND THE PREPARATION THEREOF
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IMPROVEMENTS IN CEMENT AND MORTAR COMPOSITIONS
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A process for impermeabilising, tightening or consolidating the ground and other earthy and stony masses
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RENDERING SURFACES HYDROPHOBIC
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Improvement in the manufacture of hydraulic cement
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Improvements in the properties of hydraulic cements and a process of their manufacture
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Waterproofing of materials - on the surface and in the mass
ES2076064

Mineral insulating board which is made hydrophobic and method for its manufacture
EP0980853

Process for immobilizing environmentally noxious metals and organic substances.
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Use of concrete mixture or cement mortar mixture for the construction of sewage works and a process for the preparation of such a mixture.
EP0140826

Powdery hydrophobic composition based on cement, process for their manufacture and application.
EP0008254

Cement for making concrete article having reduced capillary water absorption and method for its production
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Method for the production of a concrete body with a smooth surface, concrete body and use thereof as a cladding element or as a stamping tool
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Process for producing air-hardening mortar systems and hydraulic mortar systems
DE3528324

Process for producing concrete and mortar having water-repellent properties
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Protecting road, railway and runway sub-layer against - frost and water - with clay cement and polyacrylamide additives
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Waterproof sealing concrete mix
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Prepn process of hydrophobic fireproof heat-insulating material
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Hydrophobic oleophilic self-cementing sand and its preparation method
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Hydrophobic concrete-based polyphenylene granule heat-insulating mortar dry powder and its usage method
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METHOD FOR THE MANUFACTURE OF HYDROPHOBIC CEMENT
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METHOD FOR THE MANUFACTURE OF HYDROPHOBIC-AND-PLASTICIZED CEMENT
CA873389

WATERPROOFING MATERIAL
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Hydrophobic synthetic mineral building materials
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METHOD For protection OF UNDERGROUND oil-and-gas pipelines FROM CORROSION
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Fiber reinforced cement composite materials using chemically treated fibers with improved dispersibility
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Hydraulic binder
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