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Using water vapour and N2 isotherms to unveil effects of SCMs on nanopores and evaluate hydration degree

Huang, Liming ; Tang, Luping ; Wadsö, Lars LU ; Löfgren, Ingemar ; Olsson, Nilla LU and Yang, Zhenghong (2023) In Cement and Concrete Research 164.
Abstract

Nanopores are critical for the durability of cement-based materials, but the refinement of these pores by SCMs is yet to have a clear understanding. This paper studied effects of the water–binder ratio, SCMs and the drying on the distribution of nanopores using water vapour and N2 sorption isotherms. Results show that data of water vapour sorption can be used for a practical evaluation of the hydration degree of SCMs with thermodynamic simulation. Fly ash increases the volume of large gel and capillary pores. It lowers the difference between the sorption of water vapour and N2. Slag evidently refines the nanopores by increasing the volume of ink-bottle gel pores with an interlayer-size neck. A higher w/b produces... (More)

Nanopores are critical for the durability of cement-based materials, but the refinement of these pores by SCMs is yet to have a clear understanding. This paper studied effects of the water–binder ratio, SCMs and the drying on the distribution of nanopores using water vapour and N2 sorption isotherms. Results show that data of water vapour sorption can be used for a practical evaluation of the hydration degree of SCMs with thermodynamic simulation. Fly ash increases the volume of large gel and capillary pores. It lowers the difference between the sorption of water vapour and N2. Slag evidently refines the nanopores by increasing the volume of ink-bottle gel pores with an interlayer-size neck. A higher w/b produces more large pores to reduce the effect of drying. Removal of water induces contraction of interlayer and reduces gel pores volume, which causes large difference between sorption of water vapour and N2.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
C-S-H, Hydration degree, Pore structure, Supplementary cementitious materials, Water vapour sorption
in
Cement and Concrete Research
volume
164
article number
107042
publisher
Elsevier
external identifiers
  • scopus:85143134373
ISSN
0008-8846
DOI
10.1016/j.cemconres.2022.107042
language
English
LU publication?
yes
id
72804812-4b92-442d-bbd0-be003dee27bf
date added to LUP
2023-01-31 16:10:28
date last changed
2023-10-09 10:57:07
@article{72804812-4b92-442d-bbd0-be003dee27bf,
  abstract     = {{<p>Nanopores are critical for the durability of cement-based materials, but the refinement of these pores by SCMs is yet to have a clear understanding. This paper studied effects of the water–binder ratio, SCMs and the drying on the distribution of nanopores using water vapour and N<sub>2</sub> sorption isotherms. Results show that data of water vapour sorption can be used for a practical evaluation of the hydration degree of SCMs with thermodynamic simulation. Fly ash increases the volume of large gel and capillary pores. It lowers the difference between the sorption of water vapour and N<sub>2</sub>. Slag evidently refines the nanopores by increasing the volume of ink-bottle gel pores with an interlayer-size neck. A higher w/b produces more large pores to reduce the effect of drying. Removal of water induces contraction of interlayer and reduces gel pores volume, which causes large difference between sorption of water vapour and N<sub>2</sub>.</p>}},
  author       = {{Huang, Liming and Tang, Luping and Wadsö, Lars and Löfgren, Ingemar and Olsson, Nilla and Yang, Zhenghong}},
  issn         = {{0008-8846}},
  keywords     = {{C-S-H; Hydration degree; Pore structure; Supplementary cementitious materials; Water vapour sorption}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Cement and Concrete Research}},
  title        = {{Using water vapour and N<sub>2</sub> isotherms to unveil effects of SCMs on nanopores and evaluate hydration degree}},
  url          = {{http://dx.doi.org/10.1016/j.cemconres.2022.107042}},
  doi          = {{10.1016/j.cemconres.2022.107042}},
  volume       = {{164}},
  year         = {{2023}},
}