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Ceramics-Silikáty 46 (3) 104-109 (2002)


STABILIZING THE HIGH-TEMPERATURE PROPERTIES OF GYPSUM-FREE PORTLAND CEMENT BY Al2O3 ADDITIONS

V. Ševčík, F. Škvára

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.

Keywords: Portland cement, Refractory, High-temperature properties, Al(OH)3 admixture

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