Thermodynamic simulation of Portland cement hydration with different water content
https://doi.org/10.31675/1607-1859-2022-24-5-122-132
Abstract
Hydration of Portland cement in normal conditions is a complex problem. A detailed description of the hydration process includes the clinker dissolution, diffusion processes, surface phenomena on the nuclei of new phases, quantitative composition of the solid matter and growth of hydration products, porous structure, humidity depending on the hardening time and water/cement ratio. Thermodynamic modeling of Portland cement hydration based on the Lothenbach model allows solving these problems to a large extent. Using GEMS software, thermodynamic simulation allows detecting the amount of both initial clinker and hydration products such as cement paste, ettringite, Portlandite, and others for a long period of time. The paper presents the simulation results of the phase content during Portland cement hydration based on the Lothenbach model, in the absence of such mineral additives as calcite, lime, anhydrite, gypsum, hemihydrate, K 2 SO 4 . The water/cement ratio is 0.3, 0.4 and 0.5. It is found that the final dominant products include CSH gel of a complex composition, portlandite, insoluble clinker minerals as well as hydrogarnet, monosulfate, humidity distributed in the porous space; ettringite is absent. It is determined that the fraction of the porous space increases with increasing water content and even after 1250 days of hardening the contribution of insoluble clinkers is 20–25 g among 150 g of hydrated Portland cement.
Supporting agencies: The work was carried out within the framework of the state task of the Ministry of Science and Higher Education. of the Russian Federation (subject No. FEMN-2020-0004)
About the Authors
Yu. A. Abzaev
Tomsk State University of Architecture and Building
Russian Federation
Russian Federation
Yurii A. Abzaev, DSc, Professor
634003
2, Solyanaya Sq.
Tomsk
S. V. Korobkov
Tomsk State University of Architecture and Building
Russian Federation
Russian Federation
Sergei V. Korobkov, PhD, A/Professor
634003
2, Solyanaya Sq.
Tomsk
L. A. Anikanova
Tomsk State University of Architecture and Building
Russian Federation
Russian Federation
Lyubov A. Anikanova, PhD, A/Professor
634003
2, Solyanaya Sq.
Tomsk
V. A. Starenchenko
Tomsk State University of Architecture and Building
Russian Federation
Russian Federation
Vladimir A. Starenchenko, DSc, Professor
634003
2, Solyanaya Sq.
Tomsk
References
1. Lothenbach B., Winnerfeld F. Thermodynamic modelling of the hydration of Portland cement. Journal of Cement and Concrete Research. 2006. V. 36. No. 2. Pp. 209–226.
2. Lothenbach B., Le Saout G., Gallucci E., Scrivener K. Influence of limestone on the hydration of Portland cements. Cement and Concrete Research. 2008. V. 38. Pp. 848–860.
3. Lothenbach B., Le Saout G., Ben Haha M., Figi R., Wieland E. Hydration of a low-alkali CEM III/B–SiO 2 cement (LAC). Journal of Cement and Concrete Research. 2012. V. 42. No. 2. Pp. 410–423.
4. Ben Haha M., De Weerdt K., Lothenbach B. Quantification of the degree of reaction of fly ash. Journal of Cement and Concrete Research. 2010. V. 40. No. 11. Pp. 1620–1629.
5. Ben Haha M., Le Saout G., Winnefeld F., Lothenbach B. Influence of activator type on hydration kinetics, hydrate assemblage and microstructural development of alkali activated blast-furnace slags. Journal of Cement and Concrete Research. 2011. V. 41. No. 3. Pp. 301–310.
6. Pelletier-Chaignat L., Winnefeld F., Lothenbach B., Müller C. J. Beneficial use of limestone filler with calcium sulphoaluminate cement. Construction and Building Materials. 2012. V. 26. No. 1. Pp. 619–627.
7. Pelletier-Chaignat L., Winnefeld F., Lothenbach B., Le Saout G., Müller C. J., Famy C. Influence of the calcium sulphate source on the hydration mechanism of Portland cement-calcium sulphoaluminate clinker-calcium sulphate binders. Cement and Concrete Composites. 2011. V. 33. No. 5. Pp. 551–561.
8. Winnefeld F., Lothenbach B. Hydration of calcium sulfoaluminate cements – Experimental findings and thermodynamic modelling. Journal of Cement and Concrete Research. 2010. V. 40. No. 8. Pp. 1239–1247.
9. De Weerdt K., Ben Haha M., Le Saout G., Kjellsen K. O., Justnes H., Lothenbach B. Hydration mechanisms of ternary Portland cements containing limestone powder and fly ash. Journal of Cement and Concrete Research. 2011. V. 41. No. 3. Pp. 279–291.
10. Kunther W., Skibsted J., Lothenbach B. Influence of the Ca/Si ratio of the C–S–H phase on the interaction with sulfate ions and its impact on the ettringite crystallization pressure. Cement and Concrete Research. 2015. V. 69. Pp. 35–49.
11. Gibbs Energy Minimization software for geochemical modeling. Available: https://gems.web.psi.ch
12. Kulik D. A., Wagner T., Dmytrieva S. V., Kosakowski G., Hingerl F. F., Chudnenko K. V., Berner U. GEM-Selektor geochemical modeling package: revised algorithm and GEMS3K numerical kernel for coupled simulation codes. Computational Geosciences. 2013. V. 17. No. 1. Pp. 1–24.
13. Wagner T., Kulik D. A., Hingerl F. F., Dmytrieva S. V. GEM-Selektor geochemical modeling package: TSolMod library and data interface for multicomponent phase models. Canadian Mineralogist. 2012. V. 50. Pp. 1173–1195.
14. Matschei T. Thermodynamics of cement hydration. PhD Thesis. University of Aberdeen Department of Chemistry. 2007. 222 р.
15. Zhuangzhuang Liu, Aimin Sha, Liqun Hu, Yongwei Lu, Wenxiu Jiao, Zheng Tong, Jie Gao. Kinetic and thermodynamic modeling of Portland cement hydration at low temperatures. Journalof Chemical Papers. 2017. V. 71. No. 4. Pp. 741–751.
16. Abzaev Yu. A., Gnyrya A. I., Korobkov S. V., Gauss K. S. Phase analysis of hydrated Portland cement. IOP Conference Series: Earth and Environmental Science. 2018. V. 193. 012001.
Review
For citations:
Abzaev Yu.A., Korobkov S.V., Anikanova L.A., Starenchenko V.A. Thermodynamic simulation of Portland cement hydration with different water content. Vestnik Tomskogo gosudarstvennogo arkhitekturno-stroitel'nogo universiteta. JOURNAL of Construction and Architecture. 2022;24(5):122-132. (In Russ.) https://doi.org/10.31675/1607-1859-2022-24-5-122-132
Views:
288
Email this article 