1.

The preparation and thermal behavior of calcium monocarboaluminate.

Calcium monocarboaluminate that forms during the hydration of limestone cements was synthesized from boehmite or gibbsite, calcite and calcium hydroxide at 80 oC with synthesis times of 24- and 48 hours. Cell parameters and thermal behavior of products were determined. The formation of calcium monocarboaluminate depended on alumina source and calcite particle size. An apparent activation energy for each decomposition step was determined.

COBISS.SI-ID: 4076058

2.

The influences of the way of preparation of Me-aluminosilicates (Me=Li, Na, K, Rb and Cs) on the products.

X-ray amorphous aluminosilicates were prepared either by ion-exchange of Na ions with other alkaline cations or by direct precipitation fro Me-aluminate and Me-silicate solutions. Products and their high-temperature transformations were characterized by several methods (XRD, EDS, DSC, TG/DTG, BET). The end products were dense, nonporous MeAlSiO4 and MeAlSi2O6 phases. A strong influence of alkali cation used was evedent.

COBISS.SI-ID: 39501106