A5022780714- Wood Treatment and Properties
- Forest Ecology and Biodiversity Studies
- Tree Root and Stability Studies
- Forest ecology and management
- Lignin and Wood Chemistry
- Natural Fiber Reinforced Composites
- Lichen and fungal ecology
- Polymer composites and self-healing
- Forest Insect Ecology and Management
- Education, Psychology, and Social Research
- Remote Sensing and LiDAR Applications
- Material Properties and Processing
Mendel University in Brno
2021-2025
University of Ljubljana
2023
This article discusses the non-destructive evaluation of mechanical properties green wood. To estimate dynamic flexural modulus elasticity (MOED), a test (NDT) method—the frequency resonance technique (FRT)—was used. A three-point bending was carried out to determine static as (MOE), rupture (MOR), and toughness (Aw). presents results study comparing correlations between parameters beech (Fagus sylvatica L.) oak (Quercus robur wood, which further divided into heartwood sapwood. These species...
The aim of this paper was to analyze selected properties beech wood (Fagus sylvatica L.) treated by one-sided surface charring. Specimens were one-side charred with a hot plate using several time-temperature combinations (from 200 400 °C). Characteristics such as colour, discoloration, roughness, fire resistance, total carbohydrate content at layers and decay resistance evaluated. Surface charring applied the radial tangential surfaces. Colour measurements showed that turned grey due In...
In recent years, there has been growing interest in assessing the properties and quality of green hardwood by non-destructive testing (NDT). The frequency resonance technique (FRT) proven to be an effective NDT method assessment wood. wood with complex structures are often estimated based on mechanical standard samples. This raises two questions: (1) What effect does size have obtained during bending? (2) Is it possible describe or predict this using FRT a different structure? study we...
Abstract This article investigates the mechanical properties of linden green wood, setting out results three approaches to assessing tree stability and strength aimed at improving safety evaluation living trees. Due high moisture content (MC) wood its significant impact on properties, data from dried specimens cannot be used model behaviour. The research was carried samples with both 40 % 60 MC. A non-destructive test (NDT) assessed measured their vibro-acoustic material properties....
Wood-decaying fungi are responsible for the degradation of wood and alteration in its material properties. Fomes fomentarius (L.) Fr. is one most common white-rot colonising coarse standing trees. In recent years, according to their genetic, physiological, morphological differences, inzengae (Ces. De Not.) Lécuru was identified as an independent species. This article aimed compare impact caused by both species on anatomical, physical, mechanical properties beech wood. When comparing...
One-sided surface charred European beech wood (Fagus sylvatica L.) was studied. Radial and tangential specimens of dimensions 50 × 25 350 mm were one-sided at 200, 250, 300, 350, 400 °C for various times using a contact heating system. Specimens mm3 prepared treatment intensity analysis its effect on wettability. Density profiles the radial determined X-ray densitography with resolution 0.05 mm. The wettability analyzed via angle, measured sessile drop method over 10 to 150 s. oven-dried...
Abstract Strength loss caused by fungal degradation is an important factor to be considered during tree-stability assessment. Detailed information on the relationship between static mechanical properties in relation heterogeneity of density and dynamic parameters wood degraded soft-rot fungus Kretzschmaria deusta can improve understanding its decay process interpretation results obtained from stress-wave-based non-destructive methods used for This research presents profiles artificially...
Abstract Surface carbonization, or charring, of wooden exterior cladding boards is a modification method that creates fully organic barrier layer in resemblance to coating. The process effectively degrades the wood and transforms it into carbonaceous residue protects underlying unmodified from environmental stresses. surface quality modified this manner combination several factors depends on manufacturing species. To assess spruce birch with contact flame charring techniques, experiments...
Specimens of European beech wood (Fagus sylvatica L.) charred at 250 °C (4 min), 300 (2 and 350 (1 min) in combination with linseed oil coating were studied. The influence the surface charring process artificial weathering on discoloration, water absorption, decay resistance analyzed. Discoloration analysis showed a decrease all parameters L*, a*, b* due to process. Coating caused L* parameter. An a* was also demonstrated. As result weathering, parameter increased almost groups. group L*....
The study of the viscoelastic properties wood involves determination dynamic parameters.Different methods can be used to determine these parameters, which bring question whether parameters considered identical depending on method used.This compares frequency resonance technique and mechanical analysis for determining bending modulus elasticity (MOED) damping coefficient tan d dry green wood.Groups specimens European beech (Fagus sylvatica L.), small-leaved linden (Tilia cordata...
Various crosslinking agents can be added to the formulations of natural-based adhesives for wood bonding in order achieve better durability and higher strength formed joints. In present study, effect hexamethylenediamine (HMDA) addition on performance liquefied (LW) adhesive is investigated. Differential scanning calorimetry showed improved thermal stability LW with HMDA. The intensified presence amide linkages (C–N bonds) was found LW+HMDA attenuated total reflection Fourier transform...
Abstract Surface carbonization, or charring, of wooden exterior cladding boards is a modification method that creates fully organic barrier layer in resemblance to coating. The process effectively degrades the wood and transforms it into carbonaceous residue protects underlying unmodified from environmental stresses. surface quality modified this manner combination several factors depends on manufacturing species. To assess spruce birch with contact flame charring techniques, experiments...