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Hygro-thermo-mechanical modeling of partially saturated air-entrained concrete containing dissolved salt and exposed to freeze-thaw cycles

Eriksson, Daniel LU ; Wahlbom, David LU ; Malm, Richard and Fridh, Katja LU (2021) In Cement and Concrete Research 141.
Abstract

In cold regions, understanding the freeze-thaw behavior of air-entrained concrete is important for designing durable structures and assessing the remaining service life of existing structures. This study presents a hygro-thermo-mechanical multiphase model that describes the cyclic freeze-thaw behavior of partially saturated air-entrained concrete containing dissolved salt. An equilibrium and a non-equilibrium approach are adopted to model the ice formation, including the freeze-thaw hysteresis, inside the porous network. The model also considers the diffusive and convective transport of the dissolved salt coupled to the freeze-thaw processes. Two examples are presented to verify and highlight the capabilities of the model. The first... (More)

In cold regions, understanding the freeze-thaw behavior of air-entrained concrete is important for designing durable structures and assessing the remaining service life of existing structures. This study presents a hygro-thermo-mechanical multiphase model that describes the cyclic freeze-thaw behavior of partially saturated air-entrained concrete containing dissolved salt. An equilibrium and a non-equilibrium approach are adopted to model the ice formation, including the freeze-thaw hysteresis, inside the porous network. The model also considers the diffusive and convective transport of the dissolved salt coupled to the freeze-thaw processes. Two examples are presented to verify and highlight the capabilities of the model. The first example shows that the model is capable of reproducing the experimentally observed mechanical response of specimens containing NaC1-solutions of different concentrations. In the second example, a larger absorption of liquid from an external reservoir is obtained with an increasing salt concentration in the reservoir, which is consistent with experimental observations.

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publishing date
type
Contribution to journal
publication status
published
subject
keywords
Absorption, Finite element analysis (C), Freezing and thawing (C), Hysteresis, Salt
in
Cement and Concrete Research
volume
141
article number
106314
publisher
Elsevier
external identifiers
  • scopus:85097753874
ISSN
0008-8846
DOI
10.1016/j.cemconres.2020.106314
language
English
LU publication?
yes
id
5d7d979d-7958-4667-b77f-447f2783d300
date added to LUP
2021-01-04 11:14:48
date last changed
2021-01-04 11:14:48
@article{5d7d979d-7958-4667-b77f-447f2783d300,
  abstract     = {<p>In cold regions, understanding the freeze-thaw behavior of air-entrained concrete is important for designing durable structures and assessing the remaining service life of existing structures. This study presents a hygro-thermo-mechanical multiphase model that describes the cyclic freeze-thaw behavior of partially saturated air-entrained concrete containing dissolved salt. An equilibrium and a non-equilibrium approach are adopted to model the ice formation, including the freeze-thaw hysteresis, inside the porous network. The model also considers the diffusive and convective transport of the dissolved salt coupled to the freeze-thaw processes. Two examples are presented to verify and highlight the capabilities of the model. The first example shows that the model is capable of reproducing the experimentally observed mechanical response of specimens containing NaC1-solutions of different concentrations. In the second example, a larger absorption of liquid from an external reservoir is obtained with an increasing salt concentration in the reservoir, which is consistent with experimental observations.</p>},
  author       = {Eriksson, Daniel and Wahlbom, David and Malm, Richard and Fridh, Katja},
  issn         = {0008-8846},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {Cement and Concrete Research},
  title        = {Hygro-thermo-mechanical modeling of partially saturated air-entrained concrete containing dissolved salt and exposed to freeze-thaw cycles},
  url          = {http://dx.doi.org/10.1016/j.cemconres.2020.106314},
  doi          = {10.1016/j.cemconres.2020.106314},
  volume       = {141},
  year         = {2021},
}