ALUMINOSILICATE POLYMERS - INFLUENCE OF ELEVATED TEMPERATURES, EFFLORESCENCE

• Published in: Ceramics (Praha) Vol. 53; no. 4; pp. 276 - 282
• Main Authors: Skvara, F, Kopecky, L, Myskova, L, Smilauer, V, Alberovska, L, Vinsova, L
• Format: Journal Article
• Language: English
• Published: 01.01.2009
• ISSN: 0862-5468

Sodium bonds in an aluminosilicate polymer structure as Na(H2O)n+ and not as Na+. The Na bond in the aluminosilicate polymer structure is weak which explains the tendency of aluminosilicate polymer material to form efflorescence in a humid environment. The strength values of aluminosilicate polymer fired at temperatures in the range 200-1000 C attained their maximum at 200 C after which they declined gradually. The aluminosilicate polymer strength, after firing, was substantially higher than the residual strength of Portland cement. The Na bond in the structure suffered a fundamental change and, starting from 600 C, the character of the Na bond was the same as that in vitreous materials. The Na leaching declined in a very significant way after firing at temperatures above 600 C and a tendency to form efflorescence disappeared. Aluminosilicate polymer materials exhibit excellent material properties, but some drawbacks associated with their application include an easy leaching of alkaline components and the formation of efflorescence.