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vol. 23 / 

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H. M. HRYSHKO, Yu. L. SAVIN, D. O. SMOLIN, O. W. VATAZHYSHYN, and V. I. MOSPAN

Ukrainian State University of Science and Technologies,
Educational and Scientific Institute ‘Prydniprovs’ka State Academy of Civil Engineering and Architecture’,
24a, Architect Oleh Petrov Str., UA-49005 Dnipro, Ukraine

Research on the Influence of Nanoadditives on the Thermodynamic and Hydrodynamic Stability of the Solidification Structure of the Ettringite Phase and Its Composition with Calcium Sulphates

379–392 (2025)

PACS numbers: 61.46.-w, 61.48.De, 65.80.-g, 66.20.Ej, 83.80.Hj, 83.80.Nb, 91.60.-x

The paper considers influence of various factors on the stability of the ettringite structure of two forms of formation: а—on the base of pure minerals С3А + СṤH2, b—a mixture of alumina cement (AC-400) and gypsum plaster (G5); besides, a model of hydration process using the example of calcium sulphate hemihydrate is presented. Factors affecting stability of ettringite depending on changes in humidity and pH of the environment, temperature, and operating conditions are established. It is confirmed the hypothesis of the effect caused by the ratio G = f(СаО/Al2О3) in the minerals of the CaO–Al2O3–H2O system on the Gibbs surface energy: for СА2 = 0.27, ΔG = 24.70; for СА = 0.54, ΔG = 51.86; for С12А7 = 0.8, ΔG = 141.00, for С3А = 1.63, ΔG = 145. It is also determined the dependence of the order of formation of hydrate compounds during hydration of aluminate and sulphoaluminate cements on the Gibbs surface energy ΔG = f(Da) and the ratio ΔG = f(CaO/Al2O3) for the minerals of the system by means of the average Gibbs energy (for СА2, 24.70; for СА, 51.86; for С12А7, 141.00; for С3А, 145) of the system CaO–Al2O3–H2O: С2AН8, С4AН13, С4AН10, СAН10, Al(OН)3. Change in the heat of hydration of pure clinker minerals over time and change in their degree of hydration depend on the value of the coefficients. For example, the coefficient K (mCaO/nAl2O3 ratio) is the largest for C3A mineral, i.e., 1.63, and the heat of hydration is correspondingly the highest for C3A mineral and is of 873 J/g on the 28th day; therefore, accordingly, C3A mineral will enter the hydration reaction as the fastest. An increase in temperature is detected for artificially formed ettringite in the C3A + СṤH2 system followed by CA + СṤH2 and CA2 + СṤH2 that confirms the main idea of the experiments. Stabilization of the ettringite phase is carried out by means of the nanomodification with carbon nanotubes (CNTs), taurite, and silicon dioxide. Results of investigations performed confirm a 4–5-fold increase in strength indicators, a change in the softening factor depending on the type of nanomodifier and systems with different plasticizers and nanotubes.

KEY WORDS: nanomodifying, alumina cement, carbon nanotubes, hydration, nanosystem, solidified structure

DOI:  https://doi.org/10.15407/nnn.23.02.0379

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