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@INPROCEEDINGS{Izumoto:859327,
      author       = {Izumoto, Satoshi and Huisman, Johan Alexander and
                      Zimmermann, Egon and Esser, Odilia and Haegel, Franz-Hubert
                      and Vereecken, Harry},
      title        = {{S}pectral induced polarization response of calcite
                      precipitation},
      reportid     = {FZJ-2019-00196},
      year         = {2018},
      abstract     = {Induced calcite precipitation is used in a range of
                      geotechnical applications to improve the mechanical
                      properties of porous media. It has been shown that spectral
                      induced polarization (SIP) allows to monitor calcite
                      precipitation, although results were partly inconsistent.
                      Therefore, this study aims to investigate how the SIP
                      response of calcite depends on solute composition, since
                      this may explain the differences in previous studies. SIP
                      measurements were made on a column filled with sand while
                      calcite precipitation was created by injecting Na2CO3 and
                      CaCl2 solutions through two different ports. The experiment
                      consisted of five phases. In phase I, calcite precipitation
                      was generated for a period of 12 days. This resulted in a
                      well-defined calcite precipitation front, which was
                      associated with an increase in the imaginary conductivity.
                      In phase II, the injected solutions were increasingly
                      diluted. This resulted in a clear decrease in imaginary
                      conductivity. In phase III, the injection of the two
                      solutions was stopped. Nevertheless, calcite precipitation
                      continued and solute concentrations in the mixing zone
                      decreased. As in phase II, this led to a decrease in the
                      imaginary conductivity. In phase IV, the injection rate of
                      the Na2CO3 solution was reduced to shift the mixing zone,
                      which also decreased the imaginary conductivity. Finally,
                      the column was flushed with a solution in equilibrium with
                      calcite in phase V, which led to a very small SIP signal.
                      These results imply that calcite only generates a SIP
                      response when it is in contact with solution which is
                      strongly oversaturated with respect to calcite.},
      month         = {Oct},
      date          = {2018-10-03},
      organization  = {5th International Workshop on Induced
                       Polarization, Newark (USA), 3 Oct 2018
                       - 5 Oct 2018},
      subtyp        = {After Call},
      cin          = {IBG-3 / ZEA-2},
      cid          = {I:(DE-Juel1)IBG-3-20101118 / I:(DE-Juel1)ZEA-2-20090406},
      pnm          = {255 - Terrestrial Systems: From Observation to Prediction
                      (POF3-255) / ENIGMA - European training Network for In situ
                      imaGing of dynaMic processes in heterogeneous subsurfAce
                      environments (722028)},
      pid          = {G:(DE-HGF)POF3-255 / G:(EU-Grant)722028},
      typ          = {PUB:(DE-HGF)24},
      url          = {https://juser.fz-juelich.de/record/859327},
}