Nouvelles techniques d'évaluation et de traitement du hêtre pour des applications durables en construction | New Grading and Treatment Techniques for Beech Used in the Construction Industry

2000 ◽  
Vol 151 (7) ◽  
pp. 253-256 ◽  
Author(s):  
Jean-Luc Sandoz ◽  
Arnaud Pavillet ◽  
Lionel Demay
Keyword(s):  
Mechanical Properties ◽  
Construction Industry ◽  
Chemical Treatment ◽  
Beech Wood ◽  
Added Value ◽  
Wood Structure ◽  
Furniture Industry ◽  
Treatment Techniques ◽  
Ultrasonic Measurements

Swiss forests produce more hardwood – mainly beech – than the local woodworking industry can absorb. Where beech wood is exposed to weather, it cannot be used without a previous chemical treatment due to its naturally bad resistance to decay and insect attacks. The coloured heartwood of beech also restricts its use, especially in the furniture industry. An ultrasonic pre-grading allows to reach a higher added value for beech timber. Sylvatest and Sylvatest Duo, two instruments based on ultrasonic measurements, detect irregularities in the wood structure and allow timber-grading with regard to mechanical properties. Together with thermic treatments,which improve their resistance and durability, these techniques provide new utilisation possibilities for hardwood in the construction industry.

Comparison of mechanical properties of thermally modified wood at growth ring and cell wall level by means of instrumented indentation tests

Holzforschung ◽  
2009 ◽  
Vol 63 (4) ◽  
Author(s):  
Stefanie Stanzl-Tschegg ◽  
Wilfried Beikircher ◽  
Dieter Loidl
Keyword(s):  
Mechanical Properties ◽  
Cell Wall ◽  
Thermal Treatment ◽  
Mechanical Performance ◽  
Growth Ring ◽  
Beech Wood ◽  
Thermal Modification ◽  
Wood Structure ◽  
Instrumented Indentation ◽  
Indentation Tests

Abstract Thermal modification is a well established method to improve the dimensional stability and the durability for outdoor use of wood. Unfortunately, these improvements are usually accompanied with a deterioration of mechanical performance (e.g., reduced strength or higher brittleness). In contrast, our investigations of the hardness properties in the longitudinal direction of beech wood revealed a significant improvement with thermal modification. Furthermore, we applied instrumented indentation tests on different hierarchical levels of wood structure (growth ring and cell wall level) to gain closer insights on the mechanisms of thermal treatment of wood on mechanical properties. This approach provides a variety of mechanical data (e.g., elastic parameters, hardness parameters, and viscoelastic properties) from one single experiment. Investigations on the influence of thermal treatment on the mechanical properties of beech revealed similar trends on the growth ring as well as the on the cell wall level of the wood structure.

Research on Chemical Modification of Wood of Fast-Growing Poplar

2013 ◽  
Vol 749 ◽  
pp. 461-465
Author(s):  
De Jun Shen ◽  
Chang Hai Yu ◽  
Zhen Xing
Keyword(s):  
Mechanical Properties ◽  
Molecular Weight ◽  
Structural Material ◽  
Chemical Modification ◽  
Orthogonal Test ◽  
Low Molecular Weight ◽  
Wood Structure ◽  
Optimum Conditions ◽  
Fast Growing ◽  
Performance Requirements

This topic is considered to modify the fast-growing Poplar to improve the properties, in order to fully meet the performance requirements for the structural material. This study aims to improve the dimensional stability and some other mechanical properties through impregnated with the low-molecular-weight PF resin. Through design orthogonal test in different mole ratio of Formaldehyde and Phenol, different amount of NaOH and PVA, we make PF resin to impregnate Poplar and pressing into laminated timber to measure bonding strength, MOR, MOE. The study indicated that: the optimum conditions of the low molecular weight PF resin for modify Poplar are: mole ratio of Formaldehyde and Phenol is 2.4, mole ratio of NaOH and phenol is 0.05, amount of PVA is 3% of the phenol. Under this condition Poplar specimen got the biggest increase in various properties and it can satisfy the requirements of the outdoor wood structure.

Alternative Concrete – Geopolymer Concrete

2021 ◽  
Keyword(s):  
Mechanical Properties ◽  
Fly Ash ◽  
Construction Industry ◽  
Building Material ◽  
Construction Materials ◽  
Raw Material ◽  
Geopolymer Concrete ◽  
Sustainable Solutions ◽  
New Construction ◽  
Alkali Activated

Concrete is the most versatile, durable and reliable material and is the most used building material. It requires large amounts of Portland cement which has environmental problems associated with its production. Hence, an alternative concrete – geopolymer concrete is needed. The general aim of this book is to make significant contributions in understanding and deciphering the mechanisms of the realization of the alkali-activated fly ash-based geopolymer concrete and, at the same time, to present the main characteristics of the materials, components, as well as the influence that they have on the performance of the mechanical properties of the concrete. The book deals with in-depth research of the potential recovery of fly ash and using it as a raw material for the development of new construction materials, offering sustainable solutions to the construction industry.

Posidonia oceanica leaves for processing of PMDI composite boards

2018 ◽  
Vol 53 (12) ◽  
pp. 1697-1703
Author(s):  
Aldi Kuqo ◽  
Arjan Korpa ◽  
Nikolla Dhamo
Keyword(s):  
Mechanical Properties ◽  
Residence Time ◽  
Building Material ◽  
Posidonia Oceanica ◽  
Additional Cost ◽  
Moisture Resistance ◽  
Furniture Industry ◽  
Swelling Properties ◽  
Marine Plants ◽  
Flexural Tests

Posidonia oceanica leaves (seagrass) are collected almost in all the Mediterranean seashores as spoils and disturbing material with additional cost for removal from the coastline. Seagrass, however, is known for its interesting properties, such as decay, fire and moisture resistance as well as insulation. Research for using this material in composing boards was initiated. This study looks into the possibility of using these waste marine plants for the production of alternative building material in the form of pressed panels. The paper describes the pretreatment of seagrass leaves before their processing for composite boards and the examination of its final product. The residence time for salts desorption was also determined. The main processes analyzed were the binder spraying and panel forming. Mechanical properties were evaluated by the standardized flexural tests. In addition, swelling properties were investigated. Results obtained from testing and observation of boards indicated that seagrass leaves are propitious for the application in construction and furniture industry.

scholarly journals Mechanical Properties and Morphology of Wood Plastic Composites Produced with Thermally Treated Beech Wood

BioResources ◽  
2015 ◽  
Vol 11 (1) ◽  
Author(s):  
Farhad Arwinfar ◽  
Seyyed Khalil Hosseinihashemi ◽  
Ahmad Jahan Latibari ◽  
Amir Lashgari ◽  
Nadir Ayrilmis
Keyword(s):  
Mechanical Properties ◽  
Beech Wood ◽  
Wood Plastic Composites ◽  
Plastic Composites ◽  
Thermally Treated

scholarly journals Impact of thermal and chemical treatment on the mechanical properties of E110 and E110G cladding tubes

2019 ◽  
Vol 51 (2) ◽  
pp. 518-525 ◽  
Author(s):  
M. Király ◽  
Z. Hózer ◽  
M. Horváth ◽  
T. Novotny ◽  
E. Perez-Feró ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Chemical Treatment

scholarly journals Response of Recycled Brick Aggregate Concrete to High Temperatures

2019 ◽  
Vol 8 (10) ◽  
pp. 224-227
Keyword(s):  
Mechanical Properties ◽  
Air Pollution ◽  
Compressive Strength ◽  
Construction Industry ◽  
Fire Performance ◽  
Demolition Waste ◽  
Aggregate Concrete ◽  
Different Temperatures ◽  
Better Than ◽  
Made In

The abundant availability of demolition waste from construction industry is leading towards a significant problem of disposal, land and air pollution. The natural aggregate resources are also depleting due to development of construction activities. An attempt is made in this study to convert this waste into wealth by substituting the recycled brick from demolition waste to granite aggregate in production of the concrete. The granite aggregate (GA) is replaced with recycled brick aggregate (RBA) by 25% of its weight to produce M15 and M20 grades of concrete. The granite aggregate concrete (GAC) and recycled brick aggregate concrete (RBAC) were subjected to different temperatures between 100 to 1000oC for a duration of 3 hours and the mechanical properties such as compressive strength and flexural strength were examined to assess its fire performance. The response of RBAC is better than GAC at each temperature. The study revealed that the residual strength increases with the increase in grade of concrete at all temperatures.

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