The Effects of Natural Weathering on Color Stability of Impregnated and Varnished Wood Materials

Türkoğlu, Türkay; Baysal, Ergun; Toker, Hilmi

doi:10.1155/2015/526570

Cited by 25 publications

(45 citation statements)

References 33 publications

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“…Similar results were observed by Turkoglu et al (2015) when assessing the colorimetry of Pinus sylvestris L. and Fagus orientalis L. woods after 6 months (180 days) of exposure to natural weathering. Chromaticity (C*) is a parameter dependent on the chromatic coordinatess a* and b*, which justifies the decrease of their values, providing a reduction in the color saturation of the wood and a consequent greyish appearance on the wood surface.…”

Section: Resultssupporting

confidence: 82%

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Colorimetry and Surface Roughness of Three Amazon Woods Submitted to Natural Weathering

Kerber¹,

Stangerlin²,

Pariz³

et al. 2016

NATIVA

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This study aimed to evaluate the color and surface roughness of the wood of three Amazonian species submitted to natural weathering. For this purpose, samples of Apuleia leiocarpa (Vogel) J. F. Macbr., Erisma uncinatum Warm and Parkia pendula (Willd.) Benth. ex Walp., with dimensions of 1 x 2 x 30 cm (thickness, width and length, respectively), were exposed to natural weathering without contact with the soil for 240 days. The colorimetric characterization was performed by means of a colorimeter, and the parameters were L*, a*, b*, C*, h and ∆E. The roughness was determined with the aid of a profilometer of surface roughness, and the parameters Ra, Rz and Rt were evaluated. The wood exposed to natural weathering presented darkened (grayish color) surface, resulting from the reduction of colorimetric parameters L*, a* and b*. The Parkia pendula wood presented the greatest total variation of color in comparison to Apuleia leiocarpa and Erisma uncinatum. The parameters Ra, Rz and Rt showed an increase during the time of exposure of the woods to the natural weathering, in which Erisma uncinatum wood presented the roughest surface in comparison to the other species.Keywords: field trial, deterioration of wood, tropical wood, wood quality.Colorimetria e rugosidade superficial de três madeiras amazônicas submetidas ao intemperismo natural RESUMO: Este estudo teve como objetivo avaliar a cor e a rugosidade superficial da madeira de três espécies amazônicas submetidas ao intemperismo natural. Para tanto, amostras de Apuleia leiocarpa (Vogel) J. F. Macbr. (garapeira), Erisma uncinatum Warm (cedrinho) e Parkia pendula (Willd.) Benth. ex Walp. (angelim-saia), com dimensões de 1 x 2 x 30 cm (espessura, largura e comprimento, respectivamente), foram expostas ao intemperismo natural, sem contato com o solo, durante 240 dias. A caracterização colorimétrica foi realizada por meio de um colorímetro, sendo determinados os parâmetros L*, a*, b*, C*, h e ∆E. Por sua vez, a rugosidade foi determinada com auxílio de um rugosímetro, sendo avaliados os parâmetros Ra, Rz e Rt. As madeiras expostas ao intemperismo natural apresentaram a superfície escurecida (coloração acinzentada) da superfície, sendo essa resultante da redução dos parâmetros colorimétricos L*, a* e b*. A madeira de angelim-saia apresentou a maior variação total da cor em comparação ao cedrinho e garapeira. Os parâmetros Ra, Rz e Rt apresentaram um acréscimo ao longo do tempo de exposição das madeiras ao intemperismo natural, em que a madeira de cedrinho apresentou a superfície mais rugosa em comparação às demais espécies.Palavras-chave: ensaio de campo, deterioração da madeira, madeira tropical, qualidade da madeira.Recebido em janeiro/2016; Aceito em agosto/2016.

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Section: Resultssupporting

confidence: 82%

“…For natural weathering trials, Cademartori et al (2015) and Turkoglu et al (2015) verified ΔE values of the wood between 24.39 and 25.70 (after 360 days of weathering) and 24.50 to 33.15 (after 180 days of weathering), respectively.…”

Section: Resultsmentioning

confidence: 94%

Colorimetry and Surface Roughness of Three Amazon Woods Submitted to Natural Weathering

Kerber¹,

Stangerlin²,

Pariz³

et al. 2016

NATIVA

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“…A lot of studies were aimed at evaluating the properties of wood treated or modified with some protective compound after natural weathering (Kropf et al 1994, Nzokou et al 2011, Turkoglu et al 2015 or accelerated weathering (Tolvaj and Faix 1995, Williams et al 2001, Temiz et al 2005, Ozgenc et al 2012. In these studies, the surface became rougher and darker after weathering in comparison with the initial stages.…”

Section: Introductionmentioning

confidence: 99%

The effect of natural weathering on untreated wood surface

Oberhofnerová

Pánek

García-Cimarras

2017

Maderas, Cienc. tecnol.

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As a result of contemporary ecological and sustainable movements, a number of constructions from wood, as the only renewable building material, is still increasing. In accordance with these trends, wood elements are often left untreated. The presented study is aimed to characterize and compare a surface degradation of untreated wood caused by weathering. Weathering characteristics of softwoods and hardwoods (spruce, pine, Douglas fir, larch, oak, black locust, maple, poplar and alder) during twelve months of exposure in the climatic conditions of Central Europe were determined. All the wood species were characterized by colour and gloss changes and increasing roughness. The lowest discoloration was observed for oak and the highest one for spruce wood, respectively. The lowest changes of roughness were observed for alder, the highest for spruce wood. The depth of colour changes was relatively similar among the softwoods. Regarding hardwoods, it varied more. The values of total colour changes had a significant correlation with the depth values of these colour changes. Maple, alder and poplar samples were characterized by the presence of mould and blue-stain fungi. Douglas fir wood was found to be the most liable for the formation of cracks.

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“…Environmental awareness has led to increased interest in developing new methods and chemicals (Percin et al 2015). Thus, new generation wood preservatives such as Celcure AC 500 (CAC-500), micronized copper quat, Tanalith-e, and Adolit KD 5 are less harmful to the environment than previous chemicals containing chromium and arsenic, or they are not harmful at all (Ozgenc et al 2012;Turkoglu et al 2015a). Among the impregnation chemicals, borates have several advantages as wood preservative.…”

Section: Introductionmentioning

confidence: 99%

“…Increased restrictions on the use of conventional heavyduty wood preservatives have ensured that copper-based formulations gained wide popularity in the wood preservation industry (Freeman and McIntyre 2008). Therefore, they are commonly used in the forest product industry (Turkoglu et al 2015a;b). Wood strength is affected when wood is treated with preservatives or fire retardant chemicals (Winandy 1988).…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of Impregnated and Heat Treated Oriental Beech Wood

et al. 2016

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The main purpose of this study was to investigate mechanical properties such as the modulus of rupture (MOR) and compression strength parallel to grain (CSPG) of impregnated and heat-treated Oriental beech (Fagus orientalis L.) wood. Some copper and boron containing impregnation chemicals such as Wolmanit CX-8 (WCX-8) and Celcure AC-500 (CAC-500) were used. Wood specimens were impregnated 2% aqueous solution of the chemicals according to ASTM D1413-07e1 standard. The wood specimens were heated at 150 and 175 °C for 4 and 8 h, respectively. Results showed that both impregnation and heat treatment decreased the MOR and CSPG of Oriental beech wood. The MOR losses of Oriental beech after both treatments were higher than CSPG losses. The largest reduction of MOR and CSPG were observed with 51.5% and 15.5% for CAC-500 impregnated and heated at 175 °C for 8 h. Except for WCX-8 impregnation and heat treatment at 150 °C for 4 and 8 h, the MOR values of impregnated and heat-treated Oriental beech wood were lower than only heat-treated Oriental beech wood. It was also found that the CSPG values of impregnated and heat-treated Oriental beech wood were higher than only heat-treated Oriental beech wood, except for impregnation and heat treatment at 175 °C for 8 h.

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The Effects of Natural Weathering on Color Stability of Impregnated and Varnished Wood Materials

Cited by 25 publications

References 33 publications

Colorimetry and Surface Roughness of Three Amazon Woods Submitted to Natural Weathering

Colorimetry and Surface Roughness of Three Amazon Woods Submitted to Natural Weathering

The effect of natural weathering on untreated wood surface

Mechanical Properties of Impregnated and Heat Treated Oriental Beech Wood

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