MODELING OF MOISTURE TRANSPORT IN EARLY-AGE CEMENT PASTE
Article Sidebar
Main Article Content
Abstract
The existing approaches to modeling the moisture transport in early-age cement paste are based on the Richards equation, the key parameter of which is the moisture diffusion coefficient. To compute it, it is necessary to find expressions that link capillary pressure with the moisture content in the pore medium. For these purposes, the phenomenological models of van Genuchten are most often taken. The approach like that is not efficient, since such phenomenological models call for experimental data for fitting the necessary parameters.
In this article, instead of the phenomenological models of Van Genuchten, it is proposed to use the thermodynamic equilibrium conditions in the pore medium based on the size pore distribution of cement paste, constituting it from a single structural parameter, an approximate estimate that can be received from existing computational models of the microstructure development of cement paste, which makes it possible not to carry out experimental researches for fitting the necessary parameters.
Article Details
This work is licensed under a Creative Commons Attribution 4.0 International License.
References
Celia, М.А., Bouloutas, E.T. & Zarba, R.L. (1990). A general mass-conservative numerical solution for the unsaturated flow equation. Water Resources Research, 26(7), 1483–1496. DOI: 10.1029/WR026i007p01483.
Mainguy, M., Coussy, O. & Baroghel-Bouny, V. (2001). Role of Air Pressure in Drying of Weakly Permeable Materials. Journal of Engineering Mechanics, 127(6), 582–592. DOI: 10.1061/(ASCE)0733-9399(2001)127:6(582).
Baroghel-Bouny, V. (2007). Water vapour sorption experiments on hardened cementitious materials. Part II: Essential tool for assessment of transport properties and for durability prediction. Cement and Concrete Research, 37(3), 438-454. DOI: 10.1016/j.cemconres.2006.11.017.
Baroghel-Bouny, V., Mainguy, M., Lassabatere, T. & Coussy, O. (1999). Characterization and identification of equilibrium and transfer moisture properties for ordinary and high-performance cementitious materials. Cement and Concrete Research, 29(8), 1225–1238. DOI: 10.1016/S0008-8846(99)00102-7.
Baroghel-Bouny, V. (2007). Water vapour sorption experiments on hardened cementitious materials: Part I: Essential tool for analysis of hygral behaviour and its relation to pore structure. Cement and Concrete Research, 37(3), 414–473. DOI: 10.1016/j.cemconres.2006.11.019.
Maekawa, K., Ishida, T. & Kishi, T. (2009). Multi-scale Modelling of Structural Concrete. New York: Taylor & Francis Group.
Kravchenko, V.V. (2023). Microstructure development of the cement paste based on the unit cell model. Vestn. BSTU, (3), 48–53. (In Russ., abstr. in Engl.). DOI: 10.36773/1818-1112-2023-132-3-48-53.
El-Dieb, A.S. & Hooton, R.D. (1994). Evaluation of the Katz-Thompson model for estimating the water permeability of cement-based materials from mercury intrusion porosimetry data. Cement and Concrete Research, 24(3), 443–455. DOI: 10.1016/0008-8846(94)90131-7.
Zhang, Z., Thiery, M., Bayane, I. & Baroghel-Bouny, V. (2016). Investigation of moisture transport properties of cementitious materials. Cement and Concrete Research, (89), 257–268. DOI: 10.1016/j.cemconres.2016.08.013.
Most read articles by the same author(s)
- V. KRAVCHENKO, MODELING OF WATER DISTRIBUTION IN THE POROUS MEDIA CEMENT PASTE WITH INTERNAL CURING, Vestnik of Polotsk State University. Part F. Constructions. Applied Sciences: No. 16 (2018)
- V. KRAVCHENKO, A MODELLING FRAMEWORK OF PORTLAND CEMENT HYDRATION, Vestnik of Polotsk State University. Part F. Constructions. Applied Sciences: No. 1 (2024)
- V. KRAVCHENKO, MODELING OF THE PARAMETERS OF THE PORAL STATE OF THE CEMENT STONE WITHIN THE CONCEPT OF “INTERNAL MOISTURE”, Vestnik of Polotsk State University. Part F. Constructions. Applied Sciences: No. 8 (2017)
- V. KRAVCHENKO, CRITERIA FOR PERCOLATION THRESHOLD IN DISCRETE MICROSTRUCTURAL MODELS OF CEMENT PASTE, Vestnik of Polotsk State University. Part F. Constructions. Applied Sciences: No. 4 (2024)