Durability of Accoya Wood in Ground Stake Testing after 10 Years of Exposure in Greece.

George I Mantanis,Charalampos Lykidis,Antonios N Papadopoulos

doi:10.3390/polym12081638

George I Mantanis, Charalampos Lykidis + Show 1 more

Open Access

https://doi.org/10.3390/polym12081638

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Abstract

In this research, acetylated wood (Accoya) was tested in ground contact in central Greece. After ten years of exposure during a ground stake test, acetylated pine wood (Pinus radiata) stakes, with a 20% acetyl weight gain, were completely intact and showed no visual decay (decay rating: 0). However, the key mechanical properties of Accoya wood, that is, modulus of elasticity (MOE) and modulus of rupture (MOR) after 10 years of ground contact, were significantly reduced by 32.8% and 29.6%, respectively, despite an excellent visual result since no evidence of fungal attack was identified. This contradiction could possibly indicate that the hallmarks of decay, i.e., brown-rot decay of acetylated wood can be the significant loss of mechanical properties before decay is actually visible.

Highlights

The main target of applying chemical modifications in wood is to provide dimensional stabilityThe main target of applying chemical modifications in wood to provide dimensional stability and decay resistance [1,2,3,4,5,6].Researchers have mostly studied the is reaction of hydroxyl groups with and decay resistanceResearchers have mostly studied the reaction of hydroxyl groups acetic anhydride, a process that is called acetylation
1, where the wood hydroxyl groups are replaced by the acetyl groups of the acetic anhydride and the wood remains wood hydroxyl groupsdue aretoreplaced by action the acetyl groups the acetic and the wood in a swollen condition the bulking of the acetyl of groups withinanhydride the cell walls
modulus of elasticity (MOE) and modulus of rupture (MOR) values of Accoya wood stakes, over the 10 years of testing, were reduced by approximately 32.8% and 29.6%, respectively, as compared with the respective values of acetylated wood before the start of the test (Table 2)

Summary

Introduction

The main target of applying chemical modifications in wood is to provide dimensional stabilityThe main target of applying chemical modifications in wood to provide dimensional stability and decay resistance [1,2,3,4,5,6].Researchers have mostly studied the is reaction of hydroxyl groups with and decay resistanceResearchers have mostly studied the reaction of hydroxyl groups acetic anhydride, a process that is called acetylation. The main target of applying chemical modifications in wood is to provide dimensional stability. The main target of applying chemical modifications in wood to provide dimensional stability and decay resistance [1,2,3,4,5,6]. Researchers have mostly studied the is reaction of hydroxyl groups with and decay resistance. Researchers have mostly studied the reaction of hydroxyl groups acetic anhydride, a process that is called acetylation. The reaction is depicted, wherewith the acetic anhydride, a process that is called acetylation. Remains in a swollen condition due to the bulking action of the acetyl groups within the cell walls. The first attempt of producing acetylated wood has been recorded in 1865, when Schutzenberger. 1, where the wood hydroxyl groups are replaced by the acetyl groups of the acetic anhydride and the wood remains wood hydroxyl groupsdue aretoreplaced by action the acetyl groups the acetic and the wood in a swollen condition the bulking of the acetyl of groups withinanhydride the cell walls.

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