Abstract
The processes of structure formation of cement stone are considered. The change in the composition of the liquid phase and change in the hydration of polymineral cement over time are studied; the change in the concentration of ions of calcium in the course of cement hydration is determined. The effect of calcium chloride and sodium nitrite additives on the composition of the liquid phase during hydration of polymineral cements was investigated. It is shown that these additives significantly increase the metastable concentrations of calcium ions in the liquid phase of hydrating cements, differently affect the amount of supersaturation of the liquid phase and create different conditions for hydrate formation. The determining role of tricalcium silicate in the character of changes in the composition of the liquid phase and the conditions of subsequent hydrate formation during hardening of polymineral cements has been established. High concentrations of calcium ions in the liquid phase cause the removal of the hydrate formation zone from the surface of the initial cement grains into the volume of the intergranular space, which increases the uniformity of the distribution of the solid component in the volume of the cement stone.
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