Effect of thermal modification on the properties of narrow-leaved ash and chestnut

Korkut, Süleyman; Korkut, Derya Sevim; Kocaefe, Duygu; Elustondo, Diego; Bajraktari, Agron; Çakicier, Nevzat

doi:10.1016/j.indcrop.2011.07.016

Cited by 25 publications

(10 citation statements)

References 9 publications

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“…At its end of life cycle, heat-treated wood can be recycled without detrimental impact to the environment to the contrary of chemically treated wood impregnated with biocidal active ingredients (CRIQ 2003). This environmental acceptable treatment improves wood decay resistance (Tjeerdsma et al 2000) and dimensional stability (Korkut et al 2012), decreases wood Equilibrium Moisture Content (EMC) (Hill 2006) and induces a darker coloration of wood (Chen et al 2012), without additional chemical products. Therefore, heat treatment allows to use low durability local timber whose natural durability is low by making them resistant towards decay for a end-use in use class 2 and 3 (use class 4 being excluded due to the occurrence of soft rots) (EN 335 2013) and with high economic value (Allegretti et al 2012 ;Kamdem et al 2002).…”

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

190

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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

190

View full text Add to dashboard Cite

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“…Other studies conducted on various wood species have not confirmed any significant effect of thermal processing on surface roughness (Budakçı et al 2013;Kvietková et al 2015a, b). Generally, reduced roughness is associated with increasing modification temperature and time (Gündüz et al 2008;Korkut and Guller 2008;Korkut et al 2012;Priadi and Hiziroglu 2013;Kesik et al 2014;Salca and Hiziroglu 2014;Tasdemir and Hiziroglu 2014;Tomak et al 2014).…”

Section: Resultsmentioning

confidence: 99%

Effect of Thermal Treatment on the Surface Roughness of Scots Pine (Pinus sylvestris L.) Wood after Plane Milling

et al. 2016

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The surface roughness in plane milled Scots pine wood that was thermally modified at 190 °C and 220 °C was examined. Indicators of wood surface roughness included the three most commonly applied parameters, arithmetic mean surface roughness (Ra), surface roughness depth (Rz), and total height of the roughness profile (Rt). Roughness was tested separately for earlywood and latewood using two feed speeds of 1 and 5 m/min. The thickness of the milled layer was 1 mm. The effect of all controlled factors, i.e., feed speed, temperature of modification, and place of measurements, on the parameters of surface roughness were statistically significant (P < 0.05). Surface roughness increased with an increase in feed speed, whereas it decreased with an increased modification temperature. Latewood was characteristically lower in roughness than earlywood. The greatest differences in homogenous groups for the determination of the roughness parameters were found in measurements taken on earlywood and latewood, while the smallest differences were recorded for different feed speeds.

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“…Yildiz [26] conducted research on heat-treated spruce (Picea orientalis) and beech (Fagus orientalis) woods, mentioned that heat-treated samples at 200 °C for 10 h. density decreased 10.53% and 18.37%, respectively. Thermal degradation of wood material depends on wood species and process conditions such as treatment stage, treatment temperature and duration [27,28]. The results of the analysis of variance of the impregnation and heat treatment effects on temperature and light density of flame source combustion and without flame source combustion stages presented in Table 2.…”

Section: Statistical Analysesmentioning

confidence: 99%