Physical properties and termite durability of maritime pine Pinus pinaster Ait., heat-treated under vacuum pressure

Surini, Thibaud; Charrier, Fatima; Malvestio, Jérôme; Charrier, Bertrand; Moubarik, Amine; Castéra, Patrick; Grelier, Stéphane

doi:10.1007/s00226-011-0421-3

Cited by 51 publications

(33 citation statements)

References 35 publications

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“…Therefore, part of WL is attributed to loss of water in the anatomical structure of wood. According to Surini et al (2012), mass loss has high correlation to the moisture content of thermally treated wood. Bal and Bektas (2012) stated that the higher the mass loss, the higher the physical and mechanical modifications of the material will be.…”

Section: Physical Propertiesmentioning

confidence: 99%

Effect of thermal treatments on technological properties of wood from two Eucalyptus species

Cademartori

Missio

Mattos

et al. 2015

An. Acad. Bras. Ciênc.

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The effect of thermal treatments on physical and mechanical properties of rose gum and Sydney blue gum wood was evaluated. Wood samples were thermally modified in a combination: pre-treatment in an autoclave (127°C -1h) and treatment in an oven (180-240°C -4h); and only treatment in an oven at 180-240°C for 4h. Chemical changes in the structure of woods were evaluated through infrared spectroscopy. Evaluation of physical properties was performed through mass loss, specific gravity, equilibrium moisture content and dimensional stability tests. Surface changes were analyzed through apparent contact angle technique and static bending tests were carried out to evaluate the mechanical behavior. Use of pre-treatment in autoclave affected the properties analyzed, however oven, resulted in the highest changes on wood from both species. Chemical changes were related to the degradation of hemicelluloses. Moreover, a significant decrease of hygroscopicity and mechanical strength of thermally modified woods was observed, while specific gravity did not significantly change for either of the species studied. The best results of decrease of wettability were found in low temperatures, while dimensional stability increased as a function of temperature of exposure in oven. The highest loss of mechanical strength was observed at 240°C for both species.

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Section: Physical Propertiesmentioning

confidence: 99%

Effect of thermal treatments on technological properties of wood from two Eucalyptus species

Cademartori

Missio

Mattos

et al. 2015

An. Acad. Bras. Ciênc.

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“…This is due to the fact that the controls of the tropical species revealed excellent performance against termites as well, and full mortality was probably due to the excessive extractive content. The mortality may be explained by the formation of toxic components as a result of degradation, which were consumed by the termites (Surini et al 2012). They used maritime pine samples exposed to heat treatment under vacuum pressure, which were severely degraded by termites (R. santonensis) even though the heat treatment temperature was 230 °C; below 200 °C, the mortality rate was found to be between 50 and 55%.…”

Section: Universidad Del Bío -Bíomentioning

confidence: 99%

Comparative biological resistance of differently thermal modified wood species against decay fungi, Reticulitermes grassei and Hylotrupes bajulus

Sivrikaya

Can

Troya³

et al. 2015

Maderas, Cienc. tecnol.

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Thermal modified wood has some advantages over natural wood, including decreased hygroscopicity, increased dimensional stability, and enhanced durability. In this study, European species of Scots pine (Pinus sylvestris), spruce (Picea orientalis), ash (Fraxinus spp.), and tropical species of tali (Erythrophleum ivorense), and iroko (Chlorophora excelsa) were thermally treated at 180 °C and 210 °C for 1,5 and 2 h, respectively. We evaluated the resistances of the untreated and thermally treated samples to decay induced by the white rot fungus, Trametes versicolor and two brown rot fungi, Coniophora puteana and Postia placenta. In addition, the samples were exposed to the termite Reticulitermes grassei and the longhorn beetle species Hylotrupes bajulus to evaluate their resistance to damage by the insects. During the heat treatment, the mass loss of the samples generally was between 9 and 14%. After the heat treatment, experiments were conducted to determine the effects of white and brown rot fungi on samples of Scots pine and tali, the effect of C. puteana on spruce, and the effects of C. puteana and P. placenta on ash and iroko. In all experiments, the mass loss due to damage from the various fungi was less than 1% for the samples that had been heat treated at 210 °C. The untreated and heat-treated tropical species exhibited higher durability with very low mass loss and 100% mortality of the insects when attacked by termites, whereas the other wood species had moderate attack. In addition, Hylotrupes bajulus exposure by two standart methods (EN 46 and 47) resulted in similar performances in most cases, although EN 47 treated samples at 210 °C showed improved durability for Scots pine (Pinus sylvestris) and spruce (Picea orientalis).

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“…The main differences between them lie in the nature of the inert atmosphere and the curing conditions used during the heat treatment: gases (fumes, nitrogen), steam pressure, oil, and recently vacuum (Surini et al 2012;Allegretti et al 2012). Earlier works have shown that thermal degradation of wood depends on heat treatment intensity which is directly related to treatment temperature and duration, conditioning thus the final properties of heat treated wood (Rep et al 2004;Welzbacher et al 2007).…”

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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Physical properties and termite durability of maritime pine Pinus pinaster Ait., heat-treated under vacuum pressure

Cited by 51 publications

References 35 publications

Effect of thermal treatments on technological properties of wood from two Eucalyptus species

Effect of thermal treatments on technological properties of wood from two Eucalyptus species

Comparative biological resistance of differently thermal modified wood species against decay fungi, Reticulitermes grassei and Hylotrupes bajulus

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

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