Ceramics-Silikáty 46, (3) 104 - 109 (2002) |
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STABILIZING THE HIGH-TEMPERATURE PROPERTIES OF GYPSUM-FREE PORTLAND CEMENT BY Al₂O₃ ADDITIONS
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Ševčík Václav 1, Škvára František 2
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1 Air Force Technical Institute
Mladoboleslavská, 197 06 Prague, Czech Republic
2 Department of Glass and Ceramics, Institute of Chemical Technology
Technická 5, 166 28 Prague, Czech Republic
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Keywords: Portland cement, Refractory, High-temperature properties, Al(OH)₃ admixture
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The study deals with high-temperature properties of gypsum-free Portland cement (GF cement) based on ground clinker
of Portland cement and processed with additions of Na₂CO₃ and lignine sulphonate. An admixture of Al(OH)₃ is sufficient for
eliminating Ca(OH)₂ from hydrating GF cement. The admixture of Al(OH)₃ in hydrating GF cement results in formation of a
hydrogarnet having the composition Ca₃Al₂(SiO₄).(OH)₈. According to the results of the standard test "Determination of Resistance
to Deformation under Load at High Temperatures" (ČSN ISO 1893), the behaviour of the modified GF cement is comparable
to the properties of alumina cement with a lower content of Al₂O₃. |
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