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Adhesive to Close up the Defects of Natural Rocks

#3376.2


Development and Research on Properties of Adhesive to Close up the Defects of Natural Rocks to Improve Reliability of the Repositories of Nuclear Wastes

Tech Area / Field

  • CHE-POL/Polymer Chemistry/Chemistry
  • ENV-OTH/Other/Environment
  • ENV-WDS/Waste Disposal/Environment
  • MAT-OTH/Other/Materials

Status
3 Approved without Funding

Registration date
08.08.2007

Leading Institute
VNIIEF, Russia, N. Novgorod reg., Sarov

Supporting institutes

  • St Petersburg Technological Institute, Russia, St Petersburg

Collaborators

  • Sandia National Laboratories, USA, NM, Albuquerque\nInternational Safety Research, Canada, ON, Ottawa

Project summary

Urgency of the problem of safe operation of repositories of nuclear wastes comes from the fact that crack zones of rocks at the repositories, that are formed as a result of industrial activity of a man or tectonic loosening, create a threat of leakage of the ecologically dangerous products. The leakage process is out of control.

A possible way to solve this problem is implementation of the materials specially introduced into the defective zones to restore the solidity of the rocks and to resist successfully possible leakage caused by the decompaction of tectonic rocks and water filtration. A complex character of the problem comes from severe constraints of formation of compositions directly in the defective zones at low temperatures (up to 4°С), as well as from the pressure of water, significant extent of the defects and little disclosing of cracks.

The leading role abroad in solution of a similar task of repairing large hydraulic engineering constructions belongs to the French company called “Solitange”, which uses “Rodur” epoxy compositions (Germany) as repair compounds.

Recently in Russia there have been developed compositions on the basis of thermosetting resins and caoutchouc that are widely implemented now and have shown good results in repairs of basements and bearing constructions of industrial and civil buildings; for example, there were waterproofing repair works at Bureyskaya hydro-electric station, repair works at the Memorial to the Motherland at the Mamayev-Kurgan Complex (Volgograd city).

The main goal of the Project is the development of polymer thermoreactive materials that would ensure reliable restoration of solidity and water resistance of natural rock mass in places of repositories of nuclear wastes. It is planned to develop the materials with various viscosity (for various geometry of defective zones) that would be polymer compositions on the basis of the modified epoxy and rubber bindings and would provide the solidified structures with the following level of properties:

  • Possible hardening on wet surfaces under conditions of excessive pressure of water and at the temperatures up to 4 С
  • Destroying pressure at compression (at 20 С) – not less than 60 MPa
  • Destroying pressure at detachment (at 20 С) – not less than 11 MPa
  • Water absorption of hardened compositions – not more than 0.1 %
  • Preservation of properties of the compositions under the operating conditions – not less than 50-60 years

Completion of the works on this Project will let us create new polymer composites and the technology of their implementation competitive at the Russian and international levels.

Scientific and practical value of this work lies in possibility of production of the materials of polymer compositions that would provide safe operation of repositories of radioactive wastes and in availability of the technologies of their implementation for restoration of solidity and water resistance of rock mass and basements of the repositories of radioactive wastes.

Technical approach and methodology. To reach the goals of the Project the authors have necessary methods and equipment available, as well as highly qualified personnel in the area of polymer chemistry, radiation, physical-chemical and physical-mechanical research. There are experimental bases for realization of the goals of the Project in RFNC-VNIIEF and StPSTI (TU).

It is also important to note that employees of StPSTI (TU) have positive experience in repairs of large-scale constructions. For instance, implementation of the materials developed by them for restoration of the solidity of the basement of the dam at the Sayano-Shushenskaya Hydroelectric Power Station in 1999 allowed them to low down water filtration by 81 % in average.

On the basis of theoretical and experimental bases of RFNC-VNIIEF and StPSTI (TU) it is supposed to work out some kinds of compounding of polymer compositions and to do the research on their radiation stability, physical-chemical and physical-mechanical properties, to make predictions and to study the adhesive capacity of the composition at long storage.

Then this work may be proceeded in the following areas:

  1. Development of the equipment to mix and pump the composition into the well under high pressure;
  2. Development of techniques to evaluate the condition of a rock mass and to evaluate the results of injection.

The worked-out equipment may be exported into foreign countries that have advanced technologies of atomic industry.

A potential role of foreign collaborators. As the Project is aimed at solving acute problems of environmental protection from the hazardous effects of radioactive wastes it may promote establishment of business relations with foreign partners. Participation of foreign collaborators in the work will promote perfection of plans of the project and their realization. It is supposed to have an exchange with techniques, joint participation in seminars and publications, participation of the collaborators in technical control of the work within the project and partnership in realization of its outcomes. All thrusts of the activity can be described in more details in joint programs.


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