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@ARTICLE{Lange:849915,
      author       = {Lange, Steve and Kowalski, Piotr and Pšenička, Milan and
                      Klinkenberg, Martina and Rohmen, Stephan and Bosbach, Dirk
                      and Deissmann, Guido},
      title        = {{U}ptake of 226 {R}a in cementitious systems: {A}
                      complementary solution chemistry and atomistic simulation
                      study},
      journal      = {Applied geochemistry},
      volume       = {96},
      issn         = {0883-2927},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2018-04013},
      pages        = {204-216},
      year         = {2018},
      abstract     = {The uptake of 226Ra to various cement hydration phases such
                      as calcium-silicate-hydrates (C-S-H), ettringite (AFt) and
                      monosulfate (AFm) as well as hardened cement pastes (HCP)
                      made from ordinary Portland cement and low pH cement,
                      respectively, was studied in batch-type sorption experiments
                      under anoxic conditions. Besides sorption kinetics, the
                      effects of solution composition and solid to liquid ratios
                      were analyzed. Uptake kinetics were generally fast, leading
                      to sorption equilibrium in less than 30 days. In particular,
                      a strong retention of 226Ra by C-S-H phases was observed
                      with a dependency of distribution coefficients on the Ca/Si
                      – ratio of the C-S-H and the alkali content in solution.
                      Atomistic simulation provided evidence that, in addition to
                      Ra sorption on surface sites, the uptake of Ra due to
                      exchange for Ca in the C-S-H interlayer space is a plausible
                      uptake mechanism, in particular at low Ca/Si-ratios.
                      Experiments performed on HCP revealed a correlation between
                      sorption distribution coefficients of 226Ra and C-S-H
                      content and composition. Experiments on C-S-H alteration
                      showed that upon carbonation previously bound Ra is
                      predominantly released into the pore solution, although some
                      Ra can be retained by newly formed calcite.},
      cin          = {IEK-6},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-6-20101013},
      pnm          = {161 - Nuclear Waste Management (POF3-161) / Cebama -
                      Cement-based materials, properties, evolution, barrier
                      functions (662147)},
      pid          = {G:(DE-HGF)POF3-161 / G:(EU-Grant)662147},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000442098100019},
      doi          = {10.1016/j.apgeochem.2018.06.015},
      url          = {https://juser.fz-juelich.de/record/849915},
}