Ceramics-Silikáty 57, (4) 336 - 341 (2013) |
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STUDY OF BELITE STRUCTURE CHANGES INFLUENCED BY POTASSIUM
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Fridrichová Marcela, Dvořák Karel, Gazdič Dominik
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Brno University of Technology, Faculty of Civil Engineering, Institute of Technology of Building Materials and Components,
Veveří 95, 602 00 Brno, Czech Republic
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Keywords: Beta dicalcium silicate, Belite cement, Concrete recycling, Hydration
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The production of clinker is carried out by burning process of raw material mixture modified by potassium ions in the form
of potash (K2CO3). The potash carbonate is dosed in amounts ranging from 0 % to 3 mass %. Potassium ions are involved
in clinker creation process and causing microstructure defects. These defects lead to increase of reactivity and thus increase
of velocity of hydration process. Due to temperature instability of potassium ions at usual temperature of clinker burning
process around 1250oC, temperature regimes of 950 and 1100oC were tested with isothermal times of 1, 3, 5 hours. Phase
composition, physico-mechanical properties and hydration process were observed. |
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