Aging law of spruce wood

Froidevaux, Julien; Navi, Parviz

doi:10.1080/17480272.2012.725427

Cited by 23 publications

(12 citation statements)

References 7 publications

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“…also chapter 3.2.). One suitable method for accelerated aging, which concerns the whole wood including the inner parts, is thermal treatment (Matsuo et al 2011;Ganne-Chédeville et al 2012;Froidevaux and Navi 2013).…”

Section: Accelerated Aging and Heat Treatmentmentioning

confidence: 99%

Effects of aging on wood: a literature review

Kránitz

Sonderegger

Bues³

et al. 2015

Wood Sci Technol

140

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Knowledge of wood aging and the property changes of aged wood compared with recent wood are crucial for conservation of wooden cultural heritage objects and historic buildings constructed of wood and also for the reuse of old construction wood. Therefore, a thorough literature review is presented about the different aspects of wood aging to provide a database for further investigations. One focus lies on the different kinds of aging: natural aging under aerobic and anaerobic storage conditions in contrast to accelerated aging under heat treatment. Further, influencing factors like wood treatment and long-term loading on the aging process are discussed. Property changes of naturally aged wood that has been stored under aerobic conditions are also researched. The resulting chemical, physical, and mechanical changes are thus discussed as well as any changes in color.

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Section: Accelerated Aging and Heat Treatmentmentioning

confidence: 99%

Effects of aging on wood: a literature review

Kránitz

Sonderegger

Bues³

et al. 2015

Wood Sci Technol

140

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“…Temperature-induced ageing (in the absence of light) is the combined effect of hydrolytic and thermo-oxidative processes of wood components, mainly of hemicelluloses (the most labile) leading to formation of chromophore containing products. Cleavage of lignin units followed by condensation and depolymerisation of cellulose may also occur, with the whole process being highly influenced by the environmental conditions (presence of air and humidity) (Tdjeersma and Militz 2005;Esteves et al 2013;Froidevaux and Navi 2013;Chen et al 2014;Kránitz et al 2016). For wood used over a long period under ambient temperature conditions, ageing may be due to the combined effect of thermal oxidation by air-oxygen and acid hydrolysis by bound water and acids contained in the wood, whilst in dry heat conditions thermal oxidation is the main factor for color change during ageing (Matsuo et al 2011).…”

Section: Introductionmentioning

confidence: 99%

Effects of Ageing on the Color and Surface Chemistry of Paulownia Wood (P. elongata) from Fast Growing Crops

Liu¹,

Timar²,

Varodi³

et al. 2016

BioResources

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The behavior of paulownia wood (Paulownia elongata) was investigated using three different ageing tests: simulated natural ageing under the influence of light under indoor conditions, temperature-induced ageing in the dark, and UV-induced ageing. Ageing effects were evaluated by color measurements in the CIE Lab system. Simulated natural ageing of wood in indoor conditions (6 months) and UV-accelerated ageing (72 h) are complex and dynamic processes, which resulted mostly in yellowing of the samples due to photo-degradation. Temperature-induced ageing (288 h at 100 C) resulted mostly in a rapid and visible darkening of the paulownia wood. Comparative in-time evolution of color changes during accelerated UV ageing testing and simulated natural ageing testing under indoor conditions allowed the estimation of an acceleration index of about 50X. Fourier transform infrared spectroscopy (FTIR) was used to examine specific chemistry changes occurring during these ageing tests. UV light from natural or artificial sources caused primarily lignin degradation followed by oxidative processes leading to carbonylcontaining chromophores. Temperature-induced partial degradation of hemicelluloses and oxidative processes resulted in the formation of chromophores containing mostly conjugated carbonyl groups. This research highlighted that paulownia wood (P. elongata) is quite sensitive to ageing under the action of light and temperature, which cause notable color and surface chemistry changes.

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“…A particularly signifi cant difference is in the winter months of a year. Thus, wood located on the southern side is most affected by climatic and weather conditions, fl uctuations of which can create signifi cant stresses inside the material, as a result of which mechanical and acoustic properties can also increase during exploitation, which is confi rmed to some extentby other works in this fi eld [9,[23][24][25]. The results analyzed for certain species confi rm that the laws governing the variation of strength values for both compression along the grains and static bending, depending on the cardinal points, are identical for pine and spruce.…”

Section: Resultsmentioning

confidence: 83%

Strength of aged wood in old constructions

Fedyukov¹,

Chernov²,

Chernovà³

2020

J Appl Eng Science

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The results of comprehensive research into spruce and pine wood in a structure after 70 years of its exploitation are presented. Signifi cant changes in the wood in terms of compressive strength along the grain and static bending across the grain were revealed compared with fresh wood. The magnitude of these changes depends on the location of wood in the walls of the structure relative to the cardinal points.Key words: spruce and pine wood, equilibrium moisture content, specifi ed moisture content, ultimate compressive strengthalong the grain, static bending ultimate tensile strength across the grain

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Aging law of spruce wood

Cited by 23 publications

References 7 publications

Effects of aging on wood: a literature review

Effects of aging on wood: a literature review

Effects of Ageing on the Color and Surface Chemistry of Paulownia Wood (P. elongata) from Fast Growing Crops

Strength of aged wood in old constructions

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