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Influence of natural and artificial weathering on the colour change of different wood and wood-based materials
Kržišnik, Davor (Author), Lesar, Boštjan (Author), Thaler, Nejc (Author), Humar, Miha (Author)

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Abstract
The importance of the aesthetic performance of wood is increasing and the colour is one of the most important parameters of aesthetics, hence the colour stability of twelve different wood-based materials was evaluated by several in-service and laboratory tests. The wood used for wooden façades and decking belongs to a group of severely exposed surfaces. Discolouration of wood in such applications is a long-known phenomenon, which is a result of different biotic and abiotic causes. The ongoing in-service trial started in October 2013, whilst a laboratory test mimicking seasonal exposure was performed in parallel. Samples were exposed to blue stain fungi (Aureobasidium pullulans and Dothichiza pithyophila) in a laboratory test according to the EN 152 procedure. Afterwards, the same samples were artificially weathered and re-exposed to the same blue stain fungi for the second time. The purpose of this experiment was to investigate the synergistic effect of weathering and staining. The broader aim of the study was to determine the correlation factors between artificial and natural weathering and to compare laboratory and field test data of fungal disfigurement of various bio-based materials. During the four years of exposure, the most prominent colour changes were determined on decking. Respective changes on the façade elements were significantly less prominent, being the lest evident on the south and east façade. The results showed that there are positive correlations between natural weathering and the combination of artificial weathering and blue staining. Hence, the artificial weathering of wood-based materials in the laboratory should consist of two steps, blue staining and artificial weathering, in order to simulate colour changes.

Language:English
Keywords:artificial weathering, blue staining fungi, colour change, natural weathering, wood
Work type:Article (dk_c)
Tipology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Year:2018
Number of pages:22 str.
Numbering:Vol. 9, iss. 8, art. 488
UDC:630*8
ISSN on article:1999-4907
DOI:10.3390/f9080488 This link opens in a new window
COBISS.SI-ID:2933385 This link opens in a new window
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Downloads:42
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Record is a part of a journal

Title:Forests
Shortened title:Forests
Publisher:MDPI
ISSN:1999-4907
COBISS.SI-ID:3872166 This link opens in a new window

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:L4-5517
Name:Preprečevanje vlaženja lesa kot merilo učinkovitosti zaščite lesa pred glivami razkrojevalkami

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:L4-7547
Name:Obnašanje lesa in lignoceluloznih kompozitov v zunanjih pogojih

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:P4-0015
Name:Les in lignocelulozni kompoziti

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project no.:IC LES PST 0481-09

Funder:Drugi - Drug financer ali več financerjev
Funding Programme:Sustainable and innovative construction of smart buildings—TIGR4smart
Project no.:C3330-16-529003

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:10.08.2018

Secondary language

Language:Slovenian
Keywords:umetno pospešeno staranje, glive modrivke, barvne spremembe, naravno staranje, les

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