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Impact of environmental moisture on C(3)A polymorphs in the absence and presence of CaSO4 center dot 0.5 H2O

Dubina, Elina; Plank, Johann; Black, Leon and Wadsö, Lars LU (2014) In Advances in Cement Research 26(1). p.29-40
Abstract
The phenomenon of water vapour sorption by anhydrous C(3)A polymorphs both in the absence and in the presence of CaSO4 center dot 0.5 H2O was studied utilising dynamic and static sorption methods. It was found that orthorhombic C(3)A starts to sorb water at 55% relative humidity (RH) and cubic C(3)A at 80% RH. Also, C(3)Ao sorbs a higher amount of water which is predominantly physically bound, whereas C3Ac preferentially interacts with water by chemical reaction. In the presence of calcium sulfate hemihydrate, ettringite was observed as the predominant pre-hydration product for both C(3)A modifications: that is, ion transport had occurred between C(3)A and sulfate. Environmental scanning electron microscopic imaging revealed that in a... (More)
The phenomenon of water vapour sorption by anhydrous C(3)A polymorphs both in the absence and in the presence of CaSO4 center dot 0.5 H2O was studied utilising dynamic and static sorption methods. It was found that orthorhombic C(3)A starts to sorb water at 55% relative humidity (RH) and cubic C(3)A at 80% RH. Also, C(3)Ao sorbs a higher amount of water which is predominantly physically bound, whereas C3Ac preferentially interacts with water by chemical reaction. In the presence of calcium sulfate hemihydrate, ettringite was observed as the predominant pre-hydration product for both C(3)A modifications: that is, ion transport had occurred between C(3)A and sulfate. Environmental scanning electron microscopic imaging revealed that in a moist atmosphere, a liquid water film condenses on the surface of the phases as a consequence of capillary condensation between the particles. C(3)A and sulfate can then dissolve and react with each other. Seemingly, pre-hydration is mainly facilitated through capillary condensation and less through surface interaction with gaseous water molecules. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Advances in Cement Research
volume
26
issue
1
pages
29 - 40
publisher
ICE Publishing
external identifiers
  • wos:000329781400004
  • scopus:84900844457
ISSN
0951-7197
DOI
10.1680/adcr.12.00062
language
English
LU publication?
yes
id
13e09680-36ab-4cb3-a305-a2b30ba70663 (old id 4319602)
date added to LUP
2014-02-26 13:37:37
date last changed
2017-01-01 05:48:32
@article{13e09680-36ab-4cb3-a305-a2b30ba70663,
  abstract     = {The phenomenon of water vapour sorption by anhydrous C(3)A polymorphs both in the absence and in the presence of CaSO4 center dot 0.5 H2O was studied utilising dynamic and static sorption methods. It was found that orthorhombic C(3)A starts to sorb water at 55% relative humidity (RH) and cubic C(3)A at 80% RH. Also, C(3)Ao sorbs a higher amount of water which is predominantly physically bound, whereas C3Ac preferentially interacts with water by chemical reaction. In the presence of calcium sulfate hemihydrate, ettringite was observed as the predominant pre-hydration product for both C(3)A modifications: that is, ion transport had occurred between C(3)A and sulfate. Environmental scanning electron microscopic imaging revealed that in a moist atmosphere, a liquid water film condenses on the surface of the phases as a consequence of capillary condensation between the particles. C(3)A and sulfate can then dissolve and react with each other. Seemingly, pre-hydration is mainly facilitated through capillary condensation and less through surface interaction with gaseous water molecules.},
  author       = {Dubina, Elina and Plank, Johann and Black, Leon and Wadsö, Lars},
  issn         = {0951-7197},
  language     = {eng},
  number       = {1},
  pages        = {29--40},
  publisher    = {ICE Publishing},
  series       = {Advances in Cement Research},
  title        = {Impact of environmental moisture on C(3)A polymorphs in the absence and presence of CaSO4 center dot 0.5 H2O},
  url          = {http://dx.doi.org/10.1680/adcr.12.00062},
  volume       = {26},
  year         = {2014},
}