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Microclimate and moisture content profile measurements in rain exposed Norway spruce (Picea abies (L.) Karst.) joints

Fredriksson, Maria LU ; Wadsö, Lars LU ; Johansson, Peter LU and Ulvcrona, Thomas (2014) In Wood Material Science & Engineering
Abstract
In order to perform service life predictions of rain exposed wood structures, the moisture and temperature conditions in the structure need to be known as well as which degradation that occurs under those exposure conditions. The microclimate (the moisture conditions at the surface) is the boundary condition for moisture transport into the wood and depends on the detail design; joints between two pieces of wood can act as a water trap which give long durations of surface moisture after rain events and hinders drying. This study presents moisture content and microclimate measurements in three types of Norway spruce joints exposed to artificial rain in the laboratory. Both the microclimate (the duration of water on surfaces and in gaps) and... (More)
In order to perform service life predictions of rain exposed wood structures, the moisture and temperature conditions in the structure need to be known as well as which degradation that occurs under those exposure conditions. The microclimate (the moisture conditions at the surface) is the boundary condition for moisture transport into the wood and depends on the detail design; joints between two pieces of wood can act as a water trap which give long durations of surface moisture after rain events and hinders drying. This study presents moisture content and microclimate measurements in three types of Norway spruce joints exposed to artificial rain in the laboratory. Both the microclimate (the duration of water on surfaces and in gaps) and the moisture content profiles were monitored. The microclimate was changed by changing the size of the gap between the two boards. The duration of water in the gap depended both on the gap size and on the permeability of the wood (sapwood/heartwood, end grain surface/side grain surface). In many cases, a larger gap width gave shorter durations of high moisture contents since a larger gap gave more favourable drying conditions, but the magnitude of this reduction varied between joint types. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
in press
subject
keywords
durability, detail design, surface moisture, moisture content, heartwood, growth ring width
in
Wood Material Science & Engineering
publisher
Taylor & Francis
external identifiers
  • scopus:84908432805
ISSN
1748-0272
DOI
10.1080/17480272.2014.965742
language
English
LU publication?
yes
id
700edfff-cb7b-41e9-bdef-3c6691718aaf (old id 4779932)
alternative location
http://www.tandfonline.com/eprint/QpDpJCmjpIjfAdNKK2iW/full
date added to LUP
2014-11-17 13:36:45
date last changed
2017-01-22 04:16:37
@article{700edfff-cb7b-41e9-bdef-3c6691718aaf,
  abstract     = {In order to perform service life predictions of rain exposed wood structures, the moisture and temperature conditions in the structure need to be known as well as which degradation that occurs under those exposure conditions. The microclimate (the moisture conditions at the surface) is the boundary condition for moisture transport into the wood and depends on the detail design; joints between two pieces of wood can act as a water trap which give long durations of surface moisture after rain events and hinders drying. This study presents moisture content and microclimate measurements in three types of Norway spruce joints exposed to artificial rain in the laboratory. Both the microclimate (the duration of water on surfaces and in gaps) and the moisture content profiles were monitored. The microclimate was changed by changing the size of the gap between the two boards. The duration of water in the gap depended both on the gap size and on the permeability of the wood (sapwood/heartwood, end grain surface/side grain surface). In many cases, a larger gap width gave shorter durations of high moisture contents since a larger gap gave more favourable drying conditions, but the magnitude of this reduction varied between joint types.},
  author       = {Fredriksson, Maria and Wadsö, Lars and Johansson, Peter and Ulvcrona, Thomas},
  issn         = {1748-0272},
  keyword      = {durability,detail design,surface moisture,moisture content,heartwood,growth ring width},
  language     = {eng},
  publisher    = {Taylor & Francis},
  series       = {Wood Material Science & Engineering},
  title        = {Microclimate and moisture content profile measurements in rain exposed Norway spruce (Picea abies (L.) Karst.) joints},
  url          = {http://dx.doi.org/10.1080/17480272.2014.965742},
  year         = {2014},
}