Abstract
The effect of the thermo-hydro-mechanical (THM) densification in a closed system on the set recovery and thermal stability of lime (Tilia cordata) wood was evaluated. The THM densification process consists of four steps: plastification, densification, post-treatment and cooling. The THM-densified wood samples were subjected to three different post-treatment temperatures, and for each one, three different periods were used. Comparison between THM-densified wood sample without and with post-treatment at different temperatures and times was made. The set recovery tests showed that the post-treatment at higher temperatures and times improves the dimensional stability of the samples suggesting a permanent fixation of the transversal compression, but also reduces their thermal stability, by having lower temperatures corresponding to the maximum decomposition rate, lower values for the mass loss at the end of decomposition stage and lower values for the kinetic parameters. The samples with post-treatments at lower temperatures showed high set recovery values and exhibited higher values for the temperatures corresponding to the maximum decomposition rate, lower values for the mass loss at the end of the stage and higher activation energies and reaction orders.
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Acknowledgments
This work was performed under the framework of the COST Action FP0904. M. C. Popescu acknowledges the financial support of CNCSIS-UEFISCSU, project number PN II-RU PD 460/2010. C.-M. Popescu acknowledges the financial support of PERFORM-ERA “Postdoctoral Performance for Integration in the European Research Area” (ID-57649), financed by the European Social Fund and the Romanian Government.
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Popescu, MC., Lisa, G., Froidevaux, J. et al. Evaluation of the thermal stability and set recovery of thermo-hydro-mechanically treated lime (Tilia cordata) wood. Wood Sci Technol 48, 85–97 (2014). https://doi.org/10.1007/s00226-013-0588-x
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DOI: https://doi.org/10.1007/s00226-013-0588-x