Abrasion Resistance of Thermally and Chemically Modified Timber

Christian Brischke,Neele Ziegeler,Susanne Bollmus

doi:10.5552/drvind.2019.1813

Christian Brischke, Neele Ziegeler + Show 1 more

Open Access

https://doi.org/10.5552/drvind.2019.1813

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Journal: Drvna Industrija	Publication Date: Mar 26, 2019
Citations: 2	License type: cc-by

Affiliation: University of Göttingen

Abstract

Wood modification is an appropriate way of improving the natural durability and dimensional stability of wood without the use of biocides. Different thermal and chemical wood modification processes are available for this purpose, very differently affecting the structural integrity of wood. In this study, thermally modified, melamine resin treated, acetylated, furfurylated, and mDMDHEU treated wood underwent abrasion tests according to two different methods representing different loads in practice. The Taber Abraser method caused crosswise cutting into the wood surface, while the Shaker method challenged mainly the specimen edges with dynamic loads. Abrasion resistance of wood was affected by all types of cell wall modification, but the effects were strongly dependent on the type of modification and the applied load type. For characterising the suitability of wooden materials with respect to wear resistance under outdoor conditions, it is recommended to apply a set of methods rather than a single test procedure to fully reflect the loads occurring in practice.

Highlights

The Taber Abraser method caused crosswise cutting into the wood surface, while the Shaker method challenged mainly the specimen edges with dynamic loads
The abrasion resistance of wood was significantly affected by different modification processes, but the respective effect was strongly dependent on the method applied for testing the resistance to abrasion
Abrasion according to the Taber Abraser method was expressed as percentage reduction in thickness of the specimens (Δt) and decreased with increasing oven-dry density of the wood material (Figure 1)

Summary

Introduction

Some types of impregnation modifications have the potential to increase elasto-mechanical properties of wood Surface hardness of chemically modified wood is often increased as reported for acetylated wood (Larsson and Simonson, 1994), furfurylated wood (Lande et al, 2004, Esteves et al, 2011), DMDHEU treated wood (Emmerich et al, 2017), or melamine resin impregnated wood (Behr et al, 2017). The hardness of thermally modified wood is reduced (Gunduz et al, 2009, Meyer et al, 2011)

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