Prediction of the decay resistance of heat treated wood on the basis of its elemental composition

Šušteršic, Ž.; Mohareb, Ahmed; Chaouch, Mounir; Pétrissans, Mathieu; Petrič, Marko; Gérardin, Philippe

doi:10.1016/j.polymdegradstab.2009.10.013

Cited by 39 publications

(15 citation statements)

References 16 publications

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“…Because of dehydration reaction occurring during thermal treatment, wood carbon content increases along with treatment intensity whereas oxygen content decreases (Nguila et al 2009). Elemental wood composition has been reported as a good marker of treatment intensity and, consequently, of mass losses issued from the different degradation reactions allowing further prediction of heat treated wood rot resistance (Šušteršic et al 2010;Chaouch et al 2010). However, several authors raised the question of the reliability of heat treated wood durability laboratory tests.…”

Section: Introductionmentioning

confidence: 99%

Control of wood thermal treatment and its effects on decay resistance: a review

Candelier

Thévenon

Pétrissans

et al. 2016

Annals of Forest Science

185

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Key message An efficient use of thermal treatment of wood requires a depth understanding of the chemical modifications induced. This is a prerequisite to avoid problems of process control, and to provide high quality treated wood with accurately assessed properties to the market. Properties and structural anatomy of thermally modified woods are slightly different than un-processed woods from a same wood species. So it is necessary to create or adapt new analytical methods to control their quality. Context Heat treatment as a wood modification process is based on chemical degradation of wood polymer by heat transfer. It improves mainly the resistance of wood to decay and provides dimensional stability. These improvements, which come at the expense of a weakening of mechanical properties, have been extensively studied. Since a decade, researches focused mainly on the understanding of wood thermal degradation, on modelling, on quality prediction and quality control. Aims We aimed at reviewing the recent advances about (i) the analytical methods used to control thermal treatment; (ii) the effects on wood decay resistance and (iii) the advantages and drawbacks of a potential industrial use of wood heating. Methods We carried out a literature review of the main industrial methods used to evaluate the conferred wood properties, by thermal treatment. We used papers and reports published between 1970 and 2015, identified in the web of science data base.. Results Approximately 100 papers mostly published after 2000 were retrieved. They concentrated on: (i) wood mass loss due to thermal degradation determination, (ii) spectroscopic analyses of wood properties, (iii) colour measurements, (iv) chemical composition, (v) non-destructive mechanical assessments and (vi) use of industrial data. Conclusions One of most interesting property of heat-treated wood remains its decay resistance. Durability test with modified wood in laboratory are expensive and time-consuming. This review displays data from different analytical methods, such as spectroscopy, thermogravimetry, chemical analyses or mechanical tests that have the potential to be valuable indicators to assess the durability of heat treated wood at industrial scale. However, each method has its limits and drawbacks, such as the required investment for the equipment, reliability and accuracy of the results and ease of use at industrial scale.

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Section: Introductionmentioning

confidence: 99%

Control of wood thermal treatment and its effects on decay resistance: a review

Candelier

Thévenon

Pétrissans

et al. 2016

Annals of Forest Science

185

View full text Add to dashboard Cite

show abstract

“…The dimensional stability of wood becomes worse in wet conditions, which results in swelling of the wood and increases the risk for degradation by wood decay fungi. Thermal treatment, usually controls wood constituents without the use of oxygen (to avoid oxidation) and is carried out in the range 200 to 260 o C; this treatment gives the wood new physical, chemical, and mechanical properties (Turner et al 2010), and is an effective method to reduce hygroscopicity, improve dimensional stability, and resist fungal decay (González-Peña et al 2009;Šušteršic et al 2010). This treatment provides potential for the outdoor application of wood.…”

Section: Introductionmentioning

confidence: 99%

Thermal Treatment of Poplar Hemicelluloses at 180 to 220 °C under Nitrogen Atmosphere

Liang¹,

Wang²

2016

BioResources

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Hemicelluloses were separated from poplar wood and exposed to thermal treatment. Changes in chemical content were investigated from 180 °C to 220 °C in a nitrogen atmosphere. Fourier transform infrared spectroscopy, X-ray diffraction, and differential thermal gravimetric analysis were used to characterize the hemicellulose before and after the thermal treatment. The effects of temperature on hygroscopicity and color were measured. The results showed that hemicelluloses were sensitive to temperature. β-glucosidic bonds and side chains in hemicelluloses were cleaved around 180 °C, and the increased temperature promoted the breaking process. Esterification reactions happened during the treatment. When the treatment temperature reached 220 °C, all side chains broke down, and partial carbonization occurred. Therefore, the color became darker, and the hydrophobicity increased. This study could help to explain the changes in wood that occur during thermal treatment.

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“…The influence of treatment conditions on chemical composition and conferred properties of thermally modified wood have been intensively investigated. Previous studies have shown that new properties conferred to thermally modified wood are directly related to thermal treatment intensity, which depends directly on duration and treatment temperature (Nguila Inari et al 2009;Šušteršic et al 2010). These findings have resulted in the development of a quality control marker for thermally modified wood based on mass loss (ML).…”

Section: Introductionmentioning

confidence: 99%