Ceramics-Silikáty 53, (2) 76 - 80 (2009) |
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DETERMINATION OF Ca²⁺ IONS AT EARLY STAGE OF HYDRATING CEMENT PASTE
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Hošková Šárka 1, Tichá Petra 1,2, Demo Pavel 2,1,
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1 Department of Physics, Faculty of Civil Engineering, Czech Technical University in Prague,
Thákurova 7,166 29 Prague, Czech Republic
2 Institute of Physics, v.v.i., Academy of Sciences of the Czech Republic,
Cukrovarnická 10, 162 53, Prague, Czech Republic
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Keywords: Hydrating cement paste, Early stage of hydration, Concentration of free Ca²⁺ ions
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Novel procedure to determine instantaneous concentrations of Ca²⁺ ions in hydrating cement paste is suggested. Using EDTA and following indirect Ca²⁺ determination titrated with Mg²⁺ ions in Schwarzenbach buffer medium allows to determine calcium ion concentrations for different times. |
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