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Sorption scanning curves for hardened cementitious materials

Åhs, Magnus LU (2008) In Construction and Building Materials 22(11). p.2228-2234
Abstract
Drying of screeded floor slabs is an important issue for the building industry. However, virtually no attention is paid in prediction models to the hysteresis of sorption isotherms, mainly because of lack of data. Disregarding the hysteresis in prediction models will generate inaccurate predictions of future moisture distribution and remaining drying time. This paper presents a method for fast determination of scanning sorption isotherms and sorption isotherms by using a gravimetric vapour sorption balance. A sorption balance continuously determines the mass of a small sample subjected to a sequence of predefined vapour pressures and temperatures. Sorption isotherms and two examples of sorption scanning curves at 20 °C are presented.... (More)
Drying of screeded floor slabs is an important issue for the building industry. However, virtually no attention is paid in prediction models to the hysteresis of sorption isotherms, mainly because of lack of data. Disregarding the hysteresis in prediction models will generate inaccurate predictions of future moisture distribution and remaining drying time. This paper presents a method for fast determination of scanning sorption isotherms and sorption isotherms by using a gravimetric vapour sorption balance. A sorption balance continuously determines the mass of a small sample subjected to a sequence of predefined vapour pressures and temperatures. Sorption isotherms and two examples of sorption scanning curves at 20 °C are presented. Results from three materials commonly used in screeded slabs are included, viz concrete W/C 0.65, concrete W/C 0.55, and a screed, Floor 4310 Fibre Flow. Absorption scanning curves obtained for concrete show a significant moisture history dependence as a consequence of the hysteresis of the desorption isotherm itself. Desorption scanning curves originating from the absorption isotherms indicate little influence of the moisture history. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Sorption isotherm, Cementitious material, Vapour sorption hysteresis, Sorption scanning curve
in
Construction and Building Materials
volume
22
issue
11
pages
2228 - 2234
publisher
Elsevier
external identifiers
  • wos:000258801000012
  • scopus:47949110182
ISSN
0950-0618
DOI
10.1016/j.conbuildmat.2007.08.009
language
English
LU publication?
yes
id
9be7bc1a-ae6a-4533-a418-439076c4877e (old id 1149724)
date added to LUP
2008-05-13 13:27:53
date last changed
2017-01-01 05:37:39
@article{9be7bc1a-ae6a-4533-a418-439076c4877e,
  abstract     = {Drying of screeded floor slabs is an important issue for the building industry. However, virtually no attention is paid in prediction models to the hysteresis of sorption isotherms, mainly because of lack of data. Disregarding the hysteresis in prediction models will generate inaccurate predictions of future moisture distribution and remaining drying time. This paper presents a method for fast determination of scanning sorption isotherms and sorption isotherms by using a gravimetric vapour sorption balance. A sorption balance continuously determines the mass of a small sample subjected to a sequence of predefined vapour pressures and temperatures. Sorption isotherms and two examples of sorption scanning curves at 20 °C are presented. Results from three materials commonly used in screeded slabs are included, viz concrete W/C 0.65, concrete W/C 0.55, and a screed, Floor 4310 Fibre Flow. Absorption scanning curves obtained for concrete show a significant moisture history dependence as a consequence of the hysteresis of the desorption isotherm itself. Desorption scanning curves originating from the absorption isotherms indicate little influence of the moisture history.},
  author       = {Åhs, Magnus},
  issn         = {0950-0618},
  keyword      = {Sorption isotherm,Cementitious material,Vapour sorption hysteresis,Sorption scanning curve},
  language     = {eng},
  number       = {11},
  pages        = {2228--2234},
  publisher    = {Elsevier},
  series       = {Construction and Building Materials},
  title        = {Sorption scanning curves for hardened cementitious materials},
  url          = {http://dx.doi.org/10.1016/j.conbuildmat.2007.08.009},
  volume       = {22},
  year         = {2008},
}