Abstract
Hydration of clinker minerals plays an important role in the formation of a strong cement stone. Depending on the composition, quantity, shape, size, and structural defects of the formed crystallohydrates, the physical and technical properties of the hardened cement stone are determined. The most chemically active mineral in Portland cement clinker is tricalcium aluminate (3CaO·Al2O3), which also reacts easily and forms solid solutions with R2O. In turn, alkaline solid solutions affect the solubility of tricalcium aluminate in water and the further formation of crystallohydrates. The effect of alkaline solid solutions of tricalcium aluminate on the formation of ettringite (3CaO·Al2O3·3CaSO4·32H2O) during hydration was studied. It is established that the rates of hydration of cubic and orthorhombic crystal systems of tricalcium aluminate are different, and when they interact with dihydrate calcium sulfate, different hydration products are formed. Thus, the orthorhombic crystal system 3CaO·Al2O3 (C3A) with CaSO4·2H2O in water promotes the formation of calcium aluminate sulfate hydrate (3CaO·Al2O3·CaSO4·12H2O), which then formed calcium aluminate trisulfate hydrate (3CaO·Al2O3·3CaSO4·32H2O). A cubic system of C3A with CaSO4·2H2O in water, on the contrary, first forms a calcium aluminate trisulfate hydrate, which is eventually converted to calcium aluminate sulfate hydrate.
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