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@PHDTHESIS{Izumoto:907312,
      author       = {Izumoto, Satoshi},
      title        = {{S}pectral induced polarization of calcite precipitation in
                      porous media},
      volume       = {569},
      school       = {Univ. Stuttgart},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2022-01955},
      isbn         = {978-3-95806-614-4},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {xviii, 106},
      year         = {2022},
      note         = {Dissertation, Univ. Stuttgart, 2021},
      abstract     = {Precipitation and dissolution dynamics of calcite in
                      response to variations in groundwater pH andalkalinity are
                      important in a range of subsurface engineering applications.
                      In the context of geotechnicalengineering and subsurface
                      remediation applications, induced calcite precipitation is
                      widely used. Theeffectiveness of induced calcite
                      precipitation is typically investigated by measuring
                      hydraulic pressure,analysing biochemical properties of
                      sampled solution, and cone penetration tests. However,
                      thesemethods are spatially and temporally limited, expensive
                      and laborious. Geophysical methods havepotential to overcome
                      these limitations. In particular, Spectral Induced
                      Polarization (SIP) measurementshave been shown to be
                      sensitive to calcite precipitation. However, previous
                      experimental studiesshowed inconsistent SIP responses and
                      have not explored what controls the SIP response of calcite.
                      Inthis context, the overall aim of this thesis was to better
                      understand how spatially variable and temporallydynamic
                      calcite precipitation processes affect the SIP response.In a
                      first step, the effect of solute concentration on the SIP
                      response of calcite precipitation wasinvestigated by a
                      four-phase experiment with SIP measurements on a column
                      filled with sand. In phaseI, Na2CO3 and CaCl2 solutions were
                      co-injected, which resulted in a calcite precipitation front
                      thatincreased the imaginary part of the electrical
                      conductivity (𝜎"). In phase II, several diluted (but
                      stilloversaturated) solutions were injected into the sample
                      with calcite precipitation from phase I, whichresulted in a
                      decrease of 𝜎". The results suggested that the 𝜎"
                      associated with calcite depends morestrongly on the solute
                      conductivity than in the case of sand and sandstone. In
                      phase III, the solutionsfrom phase I were injected first and
                      then the injection was stopped. Since calcite precipitation
                      continuedafter stopping the flow, this resulted in a
                      decrease of the solute concentration in the mixing zone and
                      anassociated decrease of 𝜎". In phase IV, the injection
                      rate of the Na2CO3 solution was reduced relativeto that of
                      the CaCl2 solution. This shifted the mixing zone away from
                      the calcite precipitation front andagain the 𝜎"
                      decreased. These results clearly suggested that the SIP
                      response of calcite is sensitive tothe solute concentration
                      near the precipitates.},
      cin          = {IBG-3},
      cid          = {I:(DE-Juel1)IBG-3-20101118},
      pnm          = {2173 - Agro-biogeosystems: controls, feedbacks and impact
                      (POF4-217)},
      pid          = {G:(DE-HGF)POF4-2173},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      urn          = {urn:nbn:de:0001-2022051828},
      url          = {https://juser.fz-juelich.de/record/907312},
}