Ceramics-Silikáty |
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EXPERIMENTAL DETERMINATION OF THE ADHESIVE STRENGTH IN UNFIRED REFRACTORY MIXTURES
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Urbánek Jan 1, Macháček Jan 1, Hamáček Jiří 2, Hlinčík Tomáš 3
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1 Technopark Kralupy, University of Chemistry and Technology, Prague, Namesti G. Karse 7/2, CZ-27801 Kralupy nad Vltavou, Czech Republic
2 Department of Glass and Ceramics, University of Chemistry and Technology, Prague, Technicka 5, 16 628 Prague 6, Czech Republic
3 Department of Sustainable Fuels and Green Chemistry, University of Chemistry and Technology, Prague, Technicka 5, 166 28 Prague, Czech Republic
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Keywords: Adhesion, Cohesion, Refractories
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Adhesion is one of the key properties of unshaped refractories, such as repair, shotcrete, mortar mixtures and others. Several standard methods for measuring the adhesive properties are available in the field of polymer materials, while their number is almost zero in the case of refractory materials. The aim of the work is to develop a methodology for the adhesion measurement of fresh refractory mixtures during their setting based on a standard test used to evaluate the adhesion of paints, grouts, mortars, and concrete with a substrate. The principle of the method consists in cyclically tearing off the measuring probe from the tested mixture and recording the applied force. The results are compared with other methods used to evaluate the setting progress, such as the rotary viscometer and the Vicat needle. The applicability of the method is verified for the dependence of the adhesion on the temperature of the refractory mixture. |
doi: 10.13168/cs.2025.0041
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