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Untersuchungen zum Feuchteverhalten und zur Porosität von thermisch modifiziertem Holz

Author(s):



Medium: journal article
Language(s): German
Published in: Bauphysik, , n. 6, v. 33
Page(s): 374-381
DOI: 10.1002/bapi.201110799
Abstract:

Investigation on moisture behaviour and porosity of thermally modified timber.

The influence of thermal modification (nitrogen atmosphere, 170 to 180 °C) on the moisture behaviour of samples of spruce, beech and ash conditioned under standard climatic conditions (20 °C, 65 % relative humidity) was investigated. The sorption rate, water vapour resistance factor and water absorption coefficient were tested according to DIN EN ISO 15148: 2003-03 and DIN EN ISO 12572:2001-09. Further, the pore volume was determined using mercury porosimetry. As a consequence of the thermal treatment, the raw density of beech and ash was reduced (up to +20 %) and the total pore volume increased (+3.2 and +23.4 % respectively). The thermally modified spruce, in contrast, partially showed increased raw density values (+9 %) and thus a reduction of the pore portion (-10 %). Generally, treatment results in a decrease of the sorption rate (up to -62 %) and the water absorption coefficient (up to -76 %) as well as an increase of the water vapour resistance factor (up to +574 %). It can be derived from the determined results that the sorption and diffusion behaviour is not dependent on the increase (spruce) or the decrease (beech and ash) of the density and changes in pore volume portion involved, respectively. Primarily it is influenced by the hydrophobising of the thermal treatment.

Keywords:
water absorption coefficient moisture behaviour pore volume sorption rate thermally modified wood water vapour resistance factor
Available from: Refer to publisher
Structurae cannot make the full text of this publication available at this time. The full text can be accessed through the publisher via the DOI: 10.1002/bapi.201110799.
  • About this
    data sheet
  • Reference-ID
    10067125
  • Published on:
    05/09/2012
  • Last updated on:
    13/08/2014
 
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