and X-ray investigations were carried out on different building composites
in order to examine their relative hydration processes. The presence of lime,
hemihydrate gypsum, ferosilicate, and some other wastes as leaner and hydrophobic
additive in different proportions into composites provokes hydration reactions,
leading to calcium silicate hydrate (CSH), ettringite and an intermediate
phase formation with varying chemical composition of calcium, aluminum, silicon
DTA curves indicate several transformations taking
place between composites components, related to hydration of some phases.
The content of ettringite component corresponds to the properties and it is
used as an indicator for the possibility of industrial application. It is
found out that gypsum based cementitious binders could be used as building
material in the industry. The same time it is confirmed that the selected
wastes could be considered as secondary raw materials.