The study of volume deformations of magnesia stone and their dependence on activity of applied binders

The interrelation of deformations of magnesium-chlorate binder in the initial period of solidification with activity of initial powder of magnesium oxide, which is determined by parameters of stoving of the initial raw material, is studied in the article. Magnesium binders obtained on the basis of chemically pure magnesium hydroxide were taken for the research which included an analysis of phase composition with the use of the derivatographic analysis. Stoving of the raw material was conducted at various temperature regimes with the goal to obtain binders of various activities. Typical composition of hydrate phases in a solidified magnesia stone, obtained on the basis of binders of various rates of activity, is determined. The influence of activity of magnesium binder on the process of volume deformations occurrence in magnesia stone and its susceptibility to cracking is revealed.