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Sökning: WFRF:(Grathoff Georg)

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1.
  • Pusch, Roland, et al. (författare)
  • A study on cement-poor concrete with talc for borehole sealing in rock hosting radioactive waste
  • 2014
  • Ingår i: Comunicações Geológicas. - 0873-948X .- 1647-581X. ; 101:1, s. 71-74
  • Tidskriftsartikel (refereegranskat)abstract
    • The paper describes the performance of a concrete intended for sealing deep boreholes in the host rock of radioactive repositories. The concrete will form plugs where fracture zones are intersected and be located between very tight seals of smectite clay installed where the surrounding rock is tight. The concrete must be able to carry the clay segments after a couple of days but the bearing capacity does not have to be very high since the clay soon adheres to the rock and carries itself. The concrete contains talc as superplasticizer since ordinary organic additives for reaching high fluidity at casting are unwanted. It has a low cement content for maintaining its low porosity after dissolution in a long time perspective.
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2.
  • Pusch, Roland, et al. (författare)
  • A talc-based cement-poor concrete for sealing boreholes in rock
  • 2013
  • Ingår i: Engineering. - : Scientific Research Publishing, Inc.. - 1947-3931 .- 1947-394X. ; 5:3, s. 251-267
  • Tidskriftsartikel (refereegranskat)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 (<8 %) based on low-pH cement and with talc as plasticizer is an option but it matures more slowly, which requires that the construction of seals is made so that sufficient bearing capacity for carrying overlying clay seals is reached.
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