AbstractAbout AuthorsReferences
The results of studies of the processes of cement hydration and hardening with the help of a new design of differential micro-calorimeter, which makes it possible to record with high accuracy the change in the differential temperature difference in time between dry (standard) and wetted (sample) cements, are presented. The temperature of the system is an important thermodynamic factor, by the change in which the nature of the running processes can be judged. It is shown that the processes of hydration and hardening are accompanied by the emergence of several induction periods in which the recrystallization of the primary colloidal hydration products occurs. A necessary condition for the spontaneous formation of the structure of cement stone is the achievement, during the induction periods, of the percolation threshold, at which for further processes in the cement-water system should be a change in the geometric shape of the particles from a round, in the colloidal state, to the crystal, accompanied by a decrease in the volume of the solid phase and the appearance of free water, which interacts with the non-hydrated part of the cement grains. Due to this, the interaction of cement with water occurs at regular intervals and accompanied by acoustic vibrations, which confirms the ongoing of the dispersion process of cement particles.
V.A. LOTOV, Doctor of Sciences (Engineering) (This email address is being protected from spambots. You need JavaScript enabled to view it.)
National Research Tomsk Polytechnic University (30, Lenina Avenue, Tomsk, 634050, Russian Federation)
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10. Patent of the Russian Federation № 2475714 Differential microcalorimeter and a method of measurement of heat release / Lotov V.A., Ivanov Yu.A. Declared 22.09.2010. Published 02.20.2013. Bulletin No. 5. (In Russian).
11. Lotov V.A. Use of a differential microcalorimeter of a new design in the study of heat release in disperse systems. International Conference on Thermal Analysis and Calorimetry in Russia (RTAC-2016). St. Petersburg. 2016. Vol. 2, pp. 428–431. (In Russian).
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14. Danilov V.V. On the mechanism of hydration in a cement test. The Sixth International Congress on Chemistry of Cement. Vol. 2. Book. 2. Moscow. 1976, pp. 73–76. (In Russian).
15. Gorlenko N.P., Sarkisov Yu.S., Kuznetsova T.V. Generation of own low-frequency oscillations in the “cement-water” system. Tekhnika i tekhnologiya silikatov. 2004. No. 1, pp. 29–34. (In Russian).
2. Stark J. Recent advances in the field of cement hydration and microstructure analysis. Cement and Concrete Research. 2011. Vol. 41, pp. 666–678.
3. Thomas J.J. A new approach to modeling the nucleation and growth kinetics of tricalcium silicate hudration. Journal of American Ceramic Societies. 2007. Vol. 90. No. 10, pp. 3282–3288.
4. Juilland P., Galussi E., Flatt R., Scrivener K. Dissolution theory applied to the induction period in alite hudration. Cement and Concrete Research. 2010. Vol. 40, pp. 831–844.
5. Moser B. Progress in building materials analyses. Zement Kalk Gips International. 2010. No. 2, pp. 63–72.
6. Jennings H.M. Colloid model of C–S–H and implication to the problem of creep and shrinkage. Journal Concrete Science and Engineering. 2004. Vol. 37, pp. 59–70.
7. Vandamme M., Ulm F.-J. Nanogranular origin of concrete creep. Proceedings of the National Academy of Sciences. 2009. Vol. 106. No. 26, pp. 10552–10557.
8. Pelleng J.M., Kushima A., Shahsavari R. A realistic molecular model of cement hydrates. Proceedings of the National Academy of Sciences. 2009. Vol. 106. No. 38, pp. 16102–16107.
9. Marchon D., Flatt R.J. Mechanisms of cement hydration. Science and Technology of Concrete Admixtures. 2016, pp. 129–145. https://doi.org/10.1016/B978-0-08- 100693-1.00008-4
10. Patent of the Russian Federation № 2475714 Differential microcalorimeter and a method of measurement of heat release / Lotov V.A., Ivanov Yu.A. Declared 22.09.2010. Published 02.20.2013. Bulletin No. 5. (In Russian).
11. Lotov V.A. Use of a differential microcalorimeter of a new design in the study of heat release in disperse systems. International Conference on Thermal Analysis and Calorimetry in Russia (RTAC-2016). St. Petersburg. 2016. Vol. 2, pp. 428–431. (In Russian).
12. Serdyukova A.A., Rakhimbaev I.Sh. Influence of water-cement ratio on the kinetics of heat emission of cements. Tsement i ego primenenie. 2012. No. 3, pp. 123–130. (In Russian).
13. Usherov-Marshak A.V., Sopov V.P. Isothermal calorimetry: a standard method for studying the kinetics of cement hydration. Tsement i ego primenenie. 2009. No. 5, pp. 106–107. (In Russian).
14. Danilov V.V. On the mechanism of hydration in a cement test. The Sixth International Congress on Chemistry of Cement. Vol. 2. Book. 2. Moscow. 1976, pp. 73–76. (In Russian).
15. Gorlenko N.P., Sarkisov Yu.S., Kuznetsova T.V. Generation of own low-frequency oscillations in the “cement-water” system. Tekhnika i tekhnologiya silikatov. 2004. No. 1, pp. 29–34. (In Russian).
For citation: Lotov V.A. Periodicity of processes of cement hydration and hardening. Stroitel’nye Materialy [Construction Materials]. 2018. No. 7, pp. 55–59. DOI: 10.31659/0585-430X2018-761-7-55-59 (In Russian).