One-sided surface charring of beech wood

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F19%3A43915658" target="_blank" >RIV/62156489:43410/19:43915658 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1007/s10853-019-03589-3" target="_blank" >https://doi.org/10.1007/s10853-019-03589-3</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10853-019-03589-3" target="_blank" >10.1007/s10853-019-03589-3</a>

Result language

angličtina

Original language name

One-sided surface charring of beech wood

Original language description

One-sided surface charring of beech wood (Fagus sylvatica L.) was analyzed. Specimens were charred on one surface using contact heating system with a hot plate, at a temperature of 220 degrees C and atmospheric pressure for 15 or 40min. Surface charring was applied on the radial or tangential surface. Spectrophotometric chemical analysis was carried out to determine the total amount of soluble carbohydrates and phenolic compounds beneath the surface in order to evaluate the depth (within 1, 2, 3 and 4mm) of the degradation affected by the charring. Specimens of dimensions 14x14x14mm were used to determine the moisture behavior of charred specimens. The equilibrium moisture content (EMC) of specimens was calculated at a temperature of 20 degrees C and 65% relative humidity. Water absorption (WA) was recorded during the water immersion for 240h at various intervals. Finally, the three-point bending tests were undertaken and modulus of rupture (MOR) and modulus of elasticity were calculated. Degradation of the main wood compounds due to chemical changes occurred during the surface charring is closely associated with a mass loss (3.5-5.5%) and further related to the severity of process and orientation of specimens to heat flow. Application of surface charring resulted in the significant reduction in EMC (20%) as a result of a decrease in hydroxyl groups, an increase in cellulose crystallinity as well as further cross-linking of lignin. Furthermore, the WA of one-sided surface-charred wood considerably decreased (15%) when compared to that of the control specimens. A significant increase in soluble carbohydrates as well as phenolic compounds was found, and it can be stated that one-sided charring affected wood properties to depth 2-3mm from the surface. Significant differences (14-24%) of bending strength MOR results are most likely due to improved sorption behavior of wood. The results show that beech wood charring improved moisture-related characteristics and consequently led to better mechanical behavior, but more studies are needed to exploit the potential of surface charring method for future use.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

20502 - Paper and wood

Project

<a href="/en/project/GJ19-25171Y" target="_blank" >GJ19-25171Y: Multi-scale Hygro-thermo-mechanical Behavior of Modified Wood-based Materials</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Materials Science

ISSN

0022-2461

e-ISSN

—

Volume of the periodical

54

Issue of the periodical within the volume

13

Country of publishing house

US - UNITED STATES

Number of pages

10

Pages from-to

9497-9506

UT code for WoS article

000464908700016

EID of the result in the Scopus database

2-s2.0-85064570326