Modelling Hysteresis in the Water Sorption and Drying Shrinkage of Cement Paste

E. Masoero, M. B. Pinson, Patrick Alain Bonnaud, H. Manzano, Q. Ji, S. Yip, J. J. Thomas, M. Z. Bazant, K. Van Vliet, H. M. Jennings

研究成果: Conference contribution

1 引用 (Scopus)

抜粋

Shrinkage can be critical for the strength and durability of drying cement pastes. Shrinkage becomes particularly severe at very low relative humidity, < 20%, which can be met in some activities involving extreme temperatures. Experiments and simulations suggest that small pores in the cement paste, with approximate thickness ≤ 1 nm, stay saturated unless the humidity drops below 20%. Here we suggest that this pore size can define two different categories of pores in the paste: pores thicker than 1 nm, where the Kelvin's equation and the corresponding capillary (Laplace) pressure apply, and pores thinner than 1 nm, which can be considered as part of the solid skeleton if the humidity stays above 20%. We show that a continuum model, incorporating a pore-blocking mechanism for desorption and equilibrium thermodynamics for adsorption, explains well the sorption hysteresis for a paste that remains above ∼ 20%. At lower humidities, we assume that (1) during adsorpion water re-enters the smallest pores throughout the entire RH range (supported by experiments and simulations) and (2) there exists a simple linear relationship between water and strain in the smallest pores. These minimal assumptions are sufficient to explain the low-humidity hysteresis of water content and strain, but the underlying mechanistic explanation is still an open question. Combining the low-humidity and high-humidity models allows capturing the entire drying and rewetting hysteresis, and provides parameters to predict the corresponding dimensional changes.

元の言語English
ホスト出版物のタイトルCONCREEP 2015
ホスト出版物のサブタイトルMechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures
編集者Johann Kollegger, Christian Hellmich, Bernhard Pichler
出版者American Society of Civil Engineers (ASCE)
ページ306-312
ページ数7
ISBN(電子版)9780784479346
DOI
出版物ステータスPublished - 2015 1 1
イベント10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures, CONCREEP 2015 - Vienna, Austria
継続期間: 2015 9 212015 9 23

出版物シリーズ

名前CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures

Other

Other10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures, CONCREEP 2015
Austria
Vienna
期間15/9/2115/9/23

ASJC Scopus subject areas

  • Mechanics of Materials
  • Building and Construction

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    Masoero, E., Pinson, M. B., Bonnaud, P. A., Manzano, H., Ji, Q., Yip, S., Thomas, J. J., Bazant, M. Z., Van Vliet, K., & Jennings, H. M. (2015). Modelling Hysteresis in the Water Sorption and Drying Shrinkage of Cement Paste. : J. Kollegger, C. Hellmich, & B. Pichler (版), CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures (pp. 306-312). (CONCREEP 2015: Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures - Proceedings of the 10th International Conference on Mechanics and Physics of Creep, Shrinkage, and Durability of Concrete and Concrete Structures). American Society of Civil Engineers (ASCE). https://doi.org/10.1061/9780784479346.035