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Hydration states of AFm cement phases

Baquerizo, Luis G.; Matschei, Thomas; Scrivener, Karen L.; Saeidpour, Mahsa LU and Wadsö, Lars LU (2015) In Cement and Concrete Research 73. p.143-157
Abstract
The AFm phase, one of the main products formed during the hydration of Portland and calcium aluminate cement based systems, belongs to the layered double hydrate (LDH) family having positively charged layers and water plus charge-balancing anions in the interlayer. It is known that these phases present different hydration states (i.e. varying water content) depending on the relative humidity (RH), temperature and anion type, which might be linked to volume changes (swelling and shrinkage). Unfortunately the stability conditions of these phases are insufficiently reported. This paper presents novel experimental results on the different hydration states of the most important AFm phases: monocarboaluminate, hemicarboaluminate, stratlingite,... (More)
The AFm phase, one of the main products formed during the hydration of Portland and calcium aluminate cement based systems, belongs to the layered double hydrate (LDH) family having positively charged layers and water plus charge-balancing anions in the interlayer. It is known that these phases present different hydration states (i.e. varying water content) depending on the relative humidity (RH), temperature and anion type, which might be linked to volume changes (swelling and shrinkage). Unfortunately the stability conditions of these phases are insufficiently reported. This paper presents novel experimental results on the different hydration states of the most important AFm phases: monocarboaluminate, hemicarboaluminate, stratlingite, hydroxy AFm and monosulfoaluminate, and the thermodynamic properties associated with changes in their water content during absorption/desorption. This data opens the possibility to model the response of cementitious systems during drying and wetting and to engineer systems more resistant to harsh external conditions. (C) 2015 Elsevier Ltd. All rights reserved. (Less)
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author
organization
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Contribution to journal
publication status
published
subject
keywords
Cement hydrates (B), AFm phases (D), Hydration states (D), Thermodynamic, properties (C), Characterization techniques (B)
in
Cement and Concrete Research
volume
73
pages
143 - 157
publisher
Elsevier
external identifiers
  • wos:000357909400015
  • scopus:84925601570
ISSN
0008-8846
DOI
10.1016/j.cemconres.2015.02.011
language
English
LU publication?
yes
id
98e90cd4-bd84-4134-9a9d-4e9c417ce0c4 (old id 7789409)
date added to LUP
2015-09-18 15:45:06
date last changed
2017-11-05 04:04:45
@article{98e90cd4-bd84-4134-9a9d-4e9c417ce0c4,
  abstract     = {The AFm phase, one of the main products formed during the hydration of Portland and calcium aluminate cement based systems, belongs to the layered double hydrate (LDH) family having positively charged layers and water plus charge-balancing anions in the interlayer. It is known that these phases present different hydration states (i.e. varying water content) depending on the relative humidity (RH), temperature and anion type, which might be linked to volume changes (swelling and shrinkage). Unfortunately the stability conditions of these phases are insufficiently reported. This paper presents novel experimental results on the different hydration states of the most important AFm phases: monocarboaluminate, hemicarboaluminate, stratlingite, hydroxy AFm and monosulfoaluminate, and the thermodynamic properties associated with changes in their water content during absorption/desorption. This data opens the possibility to model the response of cementitious systems during drying and wetting and to engineer systems more resistant to harsh external conditions. (C) 2015 Elsevier Ltd. All rights reserved.},
  author       = {Baquerizo, Luis G. and Matschei, Thomas and Scrivener, Karen L. and Saeidpour, Mahsa and Wadsö, Lars},
  issn         = {0008-8846},
  keyword      = {Cement hydrates (B),AFm phases (D),Hydration states (D),Thermodynamic,properties (C),Characterization techniques (B)},
  language     = {eng},
  pages        = {143--157},
  publisher    = {Elsevier},
  series       = {Cement and Concrete Research},
  title        = {Hydration states of AFm cement phases},
  url          = {http://dx.doi.org/10.1016/j.cemconres.2015.02.011},
  volume       = {73},
  year         = {2015},
}