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Assessing the Usage of Calcium and Magnesium Hydroxide Nanoparticles as Consolidant for Dolostones

  • Fulya Karahan Dağ
  • Emine N. Caner-Saltik
  • Ayşe Tavukçuoğlu
Chapter

Abstract

Dolostone has been abundantly used in the construction of monuments during archaeological periods in Anatolia. Several of those monuments have some decay problems to be assessed and need conservation treatments to be developed. In the study, it was aimed to prepare a nanodispersive solution from the dolostone itself and follow its carbonation mineral phases in order to obtain a compatible consolidation treatment for dolostone. A mixture of calcium and magnesium hydroxide nanodispersive solution in ethyl alcohol was prepared by using Midyatdolostone, starting with its thermal decomposition. The decomposition products, lime (CaO) and periclase (MgO), were slaked to obtain a mixture of portlandite (Ca(OH)2) and brucite (Mg(OH)2) which were then dispersed in ethanol. A number of petri dishes each containing around 20 ml of nanodispersive solution were prepared and put in a chamber with 85–90% RH and high CO2 concentration around 2500 ppm at room temperature for carbonation. The carbonation process of nanodispersive solution was followed at the end of 3rd, 7th, 17th, 21st and 28th days by using XRD, FTIR and SEM-EDX in order to identify mineral phases. At the end of the 3rd day, portlandite and brucite were completely carbonated to calcite (CaCO3) and nesquehonite (Mg(CO3)2.3H2O), respectively. Dolomite formation was observed to develop in association with nesquehonite and calcite in the following days. Those phases were monitored clearly by XRD and SEM-EDX.

Keywords

Dolostone Consolidation treatment Nanodispersive solution Calcium and magnesium hydroxide XRD SEM-EDX 

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  • Fulya Karahan Dağ
    • 1
  • Emine N. Caner-Saltik
    • 2
  • Ayşe Tavukçuoğlu
    • 3
  1. 1.Graduate Program in ArchaeometryMiddle East Technical UniversityAnkaraTurkey
  2. 2.Materials Conservation Laboratory, Department of Architecture, Graduate Programs in Archaeometry and Conservation of Cultural HeritageMiddle East Technical UniversityAnkaraTurkey
  3. 3.Materials Conservation Laboratory, Department of Architecture, Graduate Programs in Building Scienceand ArchaeometryMiddle East Technical UniversityAnkaraTurkey

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