Outdoor Wood Weathering and Protection

Feist, William C.

doi:10.1021/ba-1990-0225.ch011

Cited by 116 publications

(159 citation statements)

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“…The degradation processes of lignin are accompanied by various changes in colour, depending on wood species, time of exposure and band width of the irradiation source (Hon and Minemura 2001). The grey surface colour is a result of the leaching of decay products of lignin (Feist 1983;Sell and Leukens 1971). The surface discolouration was a combination of fungal growth and photo degradation of lignin.…”

Section: Weathering Characteristicsmentioning

confidence: 99%

Weathering characteristics of wood treated with water glass, siloxane or DMDHEU

2011

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Specimens of Scots pine sapwood (Pinus sylvestris) and beech wood (Fagus sylvatica) were treated with a sodium water glass solution, an amino-alkyl-functional oligomeric siloxane and 1,3-dimethylol-4,5-dihydroxyethylene urea (DMDHEU). The specimens were exposed outside without ground contact for 24 months. Colour measurements during outside exposure showed a discoloration of all wood specimen surfaces. FTIR spectroscopy displayed lignin degradation of all specimens during the initial exposure time. Chemical treatments decelerated fungal infestation of wood, while their effect on lignin degradation was not discernible. SEM studies revealed that fungal infestation was affected by the different treatments. The untreated specimens showed radial penetration of fungal hyphae through the pits. Only superficial infestation and no radial penetration were visible at water glass and siloxane treated specimens. A significantly reduced radial penetration of fungal hyphae was exhibited at DMDHEU treated specimens. Fungal infestation through the pits was not visible. Bewitterungseigenschaften von Wasserglas, Siloxan, DMDHEU behandeltem HolzZusammenfassung Prüfkörper aus Kiefer (Pinus sylvestris) und Buche (Fagus sylvatica) wurden mit einem Natriumwasserglas, einem Amino-Alkyl-funktionellem oligomeren Silansystem, und 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU) behandelt. Unbehandelte und behandelte Prüfkörper wurden für die Dauer von 24 Monaten einer Freilandbewitterung ohne Bodenkontakt ausgesetzt. Ei-A. Pfeffer ( ) ·

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Section: Weathering Characteristicsmentioning

confidence: 99%

Weathering characteristics of wood treated with water glass, siloxane or DMDHEU

2011

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“…Macroscopic view of the transversal surface of the old wood sample: Wood surface in silver gray (1) and darkish gray (2) color, asymmetrical wood structure (3), splits (4) and checks (5) in the wood structure, and slightly eroded wood fibers in the surface of the wood element (6) All of the changes that appeared in the wood surfaces could be considered the outcome of weathering. The weathering of wood is the result of the actions of cyclic wetting and drying, exposure to ultraviolet (UV) light, and erosion of the wood surface through the wind load (Feist 1990;Sandberg 1999;Anthony 2007;Lebow and Anthony 2012).…”

Section: Macroscopic Observationsmentioning

confidence: 99%

“…These turned into longer splits due to cyclic wetting and drying of wood or freeze-thaw action. The weathering process changed the general appearance of wood and gradually eroded the wood fibers (Feist 1990;Sandberg 1999;Anthony 2007;Lebow and Anthony 2012).…”

Section: Macroscopic Observationsmentioning

confidence: 99%

Structural Evaluation of a Timber Construction Element Originating from the Great Metéoron Monastery in Greece

Doğu¹,

Yılgör²,

Mantanis³

et al. 2017

BioResources

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This study identified the wood species and evaluated the degree of weathering and biological degradation of a historical timber construction element originating from the Great Metéoron monastery in Metéora, Greece. The wood material was provided from the interior side of a balcony that was fully covered with a roof and exposed to outdoor conditions for more than 400 years. The species was identified as Quercus spp. of the white oak group. In the timber element, the physical, morphological, and chemical changes were studied to assess the type and extent of degradation using light microscopy and Fourier transform infrared (FT-IR) spectroscopy. To examine the degree of biological degradation and weathering, the surface layer and inner parts of the specimen were studied separately and compared with a recent wood specimen of the same species. The FT-IR analysis revealed remarkable differences between the surface layer and the inner parts of the historical wooden element. Macroscopic and microscopic investigation indicated that multiple types of degradation caused by weathering, fungi, and insect attacks had occurred in the wood structure. It was finally concluded that the historical timber construction element was in better condition than was expected before the study.

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“…Bu durumda sarı renk değerinde çamda en yüksek değerin elde edilmesi ve yaşlandırma sonucu en fazla değişimin meydana gelmesi literatür bilgileri ile de desteklenmektedir. (Feist, 1983;Feist, 1990;Williams, 2005;Budakçı, 2006;Bucur, 2011;Anderson ve ark., 1991;Feist ve Hon, 1984 (Temiz et. al., 2004;Nzokou ve ark., 2011;Bucur 2011;Lionetto ve ark., 2012).…”

Section: Deney Yöntemleriunclassified

“…Bunun durumun odun ekstraktifleri ve ligninin kimyasal bozunmasında kaynaklandığı bildirilmektedir (Feist, 1990;Budakçı, 2006;Kılıç ve Hafızoğlu, 2007;Anderson ve ark., 1991;Aydemir ve ark., 2011).…”

Section: Introductionunclassified

Effects of Weathering on Some Physical Properties of Wood

Budakçı¹,

Karamanoğlu²

2014

Kastamonu University Journal of Forestry Faculty

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Effects of Weathering on SomePhysicalProperties of Wood AbstractThis study has been held with the aim of determining changes in the hardness, gloss and color of Scotch Pine (PinussylvestrisL.), Eastern Beech (FagusorientalisL.), sessile oak (Quercuspetraea L.) and Anatolian Chestnut (Castanea sativa Mill.) woods which have been exposed to weathering conditions. For this reason, samples have been exposed to weathering conditions for 12 months by essentially taking ASTM D-1641 into consideration and changes in the hardness, gloss and color of the samples have been determined according to ASTM D 2240, EN ISO 2813 and ASTM D 2244 standards. In conclusion, weathering conditions have a reducing effect on hardness, gloss and color values of all woods. Maximum change has been occured on sessile oak in terms of hardness and on Scotch Pine in terms of gloss and color.

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Outdoor Wood Weathering and Protection

Abstract: The natural weathering process subjects exoised wood to discoloration

Cited by 116 publications

References 0 publications

Weathering characteristics of wood treated with water glass, siloxane or DMDHEU

Weathering characteristics of wood treated with water glass, siloxane or DMDHEU

Structural Evaluation of a Timber Construction Element Originating from the Great Metéoron Monastery in Greece

Effects of Weathering on Some Physical Properties of Wood

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