Bonding strength of heat treated compressed Eastern redcedar wood

Dilik, Tuncer; Hızıroǧlu, Salim

doi:10.1016/j.matdes.2012.05.050

Cited by 46 publications

(32 citation statements)

References 13 publications

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“…These extractives might aff ect the adhesion of bond line. Decrease of values is found to be assigned to the thermal modifi cation itself, this treatment possibly degrade the wooden mass and due to that is decrease also strength properties of wood and gives diff erent bonding properties, similar results were by (Dilik and Hiziroglu, 2012;Sernek et al, 2007Sernek et al, , 2008 reported.…”

Section: Discussionsupporting

confidence: 73%

“…Utilization of thermally treated wood in diff erent commercial products needs it to be tested at various fronts. Shear strength of thermally modifi ed -thermally modifi ed wood bonds with commercial adhesives has been investigated for various species (Dilik and Hiziroglu, 2012;Sernek et al, 2007Sernek et al, , 2008Sahin Kol et al, 2009;Ozcan et al, 2012) where diff erent degree of decrease in shear strength has been reported in various species, but there is still enough scope for thermally modifi ed wood -natural wood shear strength investigations.…”

Section: Introductionmentioning

confidence: 99%

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Bonding Strength of Thermally Treated Spruce (Picea abies) and Oak Wood

Král¹,

Klímek²,

Mishra³

2014

Acta Univ. Agric. Silvic. Mendelianae Brun.

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Thermally modifi ed wood has been widely reported to have improved durability and aesthetic appeal than its natural counterparts in same economic range. Due to this, there has been a constant eff ort to utilize its durability properties in diff erent commercial products. Utilization of outer layer thermally modifi ed wood on exposed surface is a classical idea, but bonding of thermally modifi ed to natural wood has been a challenging part and needs extensive investigation on diff erent species. In this study, we tried to investigate bonding properties of oak wood with thermally modifi ed wood (spruce) and compared it with natural oak -oak bond strength. We observed a signifi cant decrease of 47% in value of shear strength for thermally treated wood with natural wood when compared with natural oak -oak bonding. Thermally treated wood can be used as outermost layer in those products, where shear strength does not play a crucial role and more research is required to improve its bonding with natural wood to increase its applicability range.

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Section: Discussionsupporting

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Bonding Strength of Thermally Treated Spruce (Picea abies) and Oak Wood

Král¹,

Klímek²,

Mishra³

2014

Acta Univ. Agric. Silvic. Mendelianae Brun.

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“…The pH of wood can influence the hardening of an adhesive, which might either retard or accelerate the adhesive curing, depending on the adhesive used for bonding (Kariz and Sernek 2010). Dilik and Hiziroglu (2012) investigated the effect of heat treatment and compression on bonding strength of Eastern red cedar (Juniperus virginiana) wood. Test samples were exposed to 120 °C, 160 °C, and 190 °C for 6 h before they were compressed using 2.5 MPa pressure for 5 min and bonded with polyvinyl acetate (PVAc) adhesive.…”

Section: Resultsmentioning

confidence: 99%

Bonding Strength of Some Adhesives in Heat-Treated Hornbeam (Carpinus betulus L.) Wood Used for Interior and Exterior Decoration

Uzun¹,

Perçin²,

Altınok³

et al. 2016

BioResources

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Heat-treated wood has an ever-expanding market for exterior and interior applications. The objective of this study was to determine the effect of a heat treatment on the bonding strength of hornbeam (Carpinus betulus L.) wood that was bonded with melamine formaldehyde (MF), polyurethane (PUR), and polyvinyl acetate (PVAc-D4) adhesives. Hornbeam lamellas were heat treated at 150 °C, 175 °C, 200 °C, and 225 °C for 3 h and then bonded. The bonding strength of the specimens was determined. In addition, the density, weight loss, and pH value of the heat-treated wood were investigated. The results showed that the bonding strengths of the heat-treated wood specimens decreased with the temperature of the heat treatment. The bonding strength of the PUR adhesive was higher than the MF and the PVAc-D4.

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“…These upgraded properties conferred to the wood are the result of chemical modifications of wood cell wall polymers occurring during treatment (Tjeerdsma and Militz 2005;Yildiz et al 2006;Inari et al 2007). However, these durability enhancements have an adverse effect on wood mechanical properties (Gunduz et al 2009;Andersons et al 2012;Dilik and Hiziroglu 2012). Although the surface hardness of the heat treated wood is improved, its other mechanical properties, such as bending and compression strengths, stiffness and shear strength, are considerably weakened according to thermal process conditions and treatment intensities (Kocaefe et al 2008;Candelier et al 2013d;Hannouz et al 2015).…”

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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Bonding strength of heat treated compressed Eastern redcedar wood

Cited by 46 publications

References 13 publications

Bonding Strength of Thermally Treated Spruce (Picea abies) and Oak Wood

Bonding Strength of Thermally Treated Spruce (Picea abies) and Oak Wood

Bonding Strength of Some Adhesives in Heat-Treated Hornbeam (Carpinus betulus L.) Wood Used for Interior and Exterior Decoration

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

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