Sorption hysteresis and scanning in a flooring screed implications for moisture induced degradation
Författare
Summary, in English
Sorption isotherms (moisture content as a function of relative humidity (RH) at equilibrium) are an important tool in designing buildings to limit moisture related problems. Normally only a single sorption curve is used so that each moisture content uniquely corresponds to one RH. Sometimes two curves are used, one curve for absorption and one for desorption, as it is well known that sorption has a strong hysteresis for most materials. However, in most situations, materials do not simply follow either absorption or desorption, but will follow scanning curves within the hystersis envelope. In this paper we discuss data on sorption hysteresis and scanning for a cement based flooring material. These data show that the RH-increase will be many times higher when the flooring material absorbs moisture from, e.g., water based adhesives, than would have been predicted by a model without scanning. Implications for expressing critical moisture levels are discussed.
Avdelning/ar
Publiceringsår
2005
Språk
Engelska
Sidor
3928-3932
Publikation/Tidskrift/Serie
Indoor Air 2005: Proceedings of the 10th International Conference on Indoor Air Quality and Climate, Vols 1-5
Dokumenttyp
Konferensbidrag
Förlag
Tsinghua University Press
Ämne
- Materials Engineering
Nyckelord
- relative
- humidity
- moisture content
- scanning
- sorption isotherm
- hysteresis
Conference name
10th International Conference on Indoor Air Quality and Climate (Indoor Air 2005)
Conference date
2005-09-04 - 2005-09-09
Conference place
Beijing, China
Status
Published
ISBN/ISSN/Övrigt
- ISBN: 7-89494-830-6