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A Talc-Based Cement-Poor Concrete for Sealing Boreholes in Rock

Authors :
Sven Knutsson
Roland Pusch
Georg Grathoff
Alireza Pourbakhtiar
Mohammed Hatem Mohammed
Laurence N. Warr
Source :
Engineering. :251-267
Publication Year :
2013
Publisher :
Scientific Research Publishing, Inc., 2013.

Abstract

Deep investigation boreholes in crystalline rock for site selection of repositories for high-level radioactive waste are proposed to be sealed by installing a series of dense concrete and clay plugs. These should prevent radionuclides from leaking canisters at depth to migrate to the biosphere through the holes. The concrete seals will be installed where the holes intersect water-bearing fracture zones to serve as stable and low-permeable supports for adjacent clay plugs. Low porosity and microstructural stability must be guaranteed for many thousands of years and ordinary Portland cement with organic superplastizer will not fulfil the requirements since the high pH will cause degradation of contacting clay and the organic additive can produce colloids with a capacity to carry radionuclides up to the biosphere. Very cement-poor concrete (Validerad; 2013; 20130104 (mohhat)

Details

ISSN :
1947394X, 19473931, and 20130104
Database :
OpenAIRE
Journal :
Engineering
Accession number :
edsair.doi.dedup.....eb426bf1238401303f339c6999e6c751
Full Text :
https://doi.org/10.4236/eng.2013.53036