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Experimental investigation on mechanical properties of acetylated birch plywood and its angle-dependence
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.ORCID iD: 0000-0002-6226-4867
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.ORCID iD: 0000-0002-6698-3770
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.ORCID iD: 0000-0002-5347-4467
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.ORCID iD: 0000-0002-9156-3161
2022 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 344, p. 128277-, article id 128277Article in journal (Refereed) Published
Abstract [en]

There is an increasing demand for engineered wood products (EWPs) due to the flourish of modern timber structures during recent years. However, the durability-related issues are still unignorable limitations when applying timber to outdoor structures. Therefore, treatment measures are still needed to enhance the durability of timber. The acetylation process, which involves the reaction between acetic anhydride and wood, has been widely studied as a wood modification method during the past decades. Several experimental studies have proven acetylation to effectively reduce wood's hygroscopicity while improving its dimensional stability and fungal decay resistance. For load-bearing timber structures, especially those in the outdoor environment, the combination of acetylation and EWPs gives the possibility to manufacture more durable and stable timber ele-ments in the context of dimensions and mechanical properties. This study concerns the mechanical and elastic properties of acetylated birch plywood. More specifically, tensile, compressive, shear and bending tests were conducted under three different load-to-face grain angles, namely from 0 degrees (parallel), 22.5 degrees, to 45 degrees. The test results were thereafter compared with ordinary unmodified birch plywood concerning stress-strain relationships, failure modes, strength, and elastic properties.

Place, publisher, year, edition, pages
Elsevier BV , 2022. Vol. 344, p. 128277-, article id 128277
Keywords [en]
Engineered wood products, Wood modification, Acetylation, Birch plywood, Timber engineering, Angle-dependence
National Category
Biochemistry and Molecular Biology
Identifiers
URN: urn:nbn:se:kth:diva-317199DOI: 10.1016/j.conbuildmat.2022.128277ISI: 000841432100001Scopus ID: 2-s2.0-85133241480OAI: oai:DiVA.org:kth-317199DiVA, id: diva2:1695282
Note

QC 20220913

Available from: 2022-09-13 Created: 2022-09-13 Last updated: 2023-12-07Bibliographically approved
In thesis
1. In-plane mechanical properties of acetylated birch plywood and its response to humidity elevation
Open this publication in new window or tab >>In-plane mechanical properties of acetylated birch plywood and its response to humidity elevation
2023 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Due to the recent flourish of modern timber structures, there is an increasing demand for engineered wood products (EWPs). However, outdoor exposure of EWPs often poses a risk of durability-related issues. For load-bearing timber structures, especially those in the outdoor environment, the combination of wood modification by acetylation and concept of EWPs allows manufacturing more durable and stable timber elements. This thesis concerns the angle-dependent in-plane mechanical properties of plywood manufactured from acetylated birch veneers (ABP). Specifically, tensile, compressive, shear and bending tests were conducted at three different load-to-face grain angles, namely from 0° (parallel), 22.5°, to 45°. The test results were compared with ordinary unmodified birch plywood (UBP) concerning stress-strain relationships, failure modes, strength, and elastic properties. Besides, for better understanding the moisture effect on the mechanical properties of both acetylated and unmodified birch plywood, specimens of both type were conditioned in climate chambers under three different environments, with the temperature of 20°C and elevating relative humidity (RH) from 35% to 65% to 95%. In this case, specimens with the load-to-face grain angles of 0°, 45°, and 90° were tested. The influence of both RH and measured moisture contents (MC) on bending strength and stiffness was evaluated. Variations of utilized brittleness terms under different RH conditions and load-face grain angles were also studied. Prediction formulas of mechanical properties with MC were derived by performing linear regressions among test results. The test results reveal that ABP possesses equivalent mechanical properties to UBP specimens. Under relative humidity elevation, acetylated plywood depicts more stable mechanical properties but higher brittleness than untreated specimens.

Abstract [sv]

Marknaden för träbaserade byggsystem har expanderat kraftigt under senare år vilket inneburit ökad efterfrågan på förädlade träprodukter, så kallade engineered wood products (EWPs). Utomhusexponering av EWPs innebär dock ofta en risk för beständighetsrelaterade problem. För bärande träkonstruktioner i utomhusmiljö möjliggör kombinationen av trämodifiering genom acetylering och EWP, en tillverkning av träkonstruktionselement med både hög beständighet och hållfasthet. Denna avhandling berör de mekaniska egenskaperna hos plywood tillverkad av acetylerade björkfanér. Specifikt utfördes drag-, tryck-, skjuvnings- och böjtester i förhållande till fibervinkeln hos plywoodens ytfanér vid 0° (parallellt med fiberriktningen), 22,5°, och 45°. Testresultaten jämfördes med kommersiell omodifierad björkplywoods egenskaper avseende spännings- och töjningsförhållanden, orsaker till brott, styrka och styvhet. Dessutom genomfördes liknande tester där prover konditionerats i tre olika klimat för att undersöka inverkan av klimatet på de mekaniska egenskaperna hos både acetylerad och omodifierad björkplywood. Konditioneringen genomfördes i klimatkammare vid en temperatur av 20°C vid 35, 65 respektive 95 % relativ luftfuktighet (RF). I detta fall belastades proverna i förhållande till fibervinkeln hos ytfanéren vid 0°, 45° och 90°. Inverkan av konditioneringen i olika klimat studerades med avseende på böjhållfasthet, styvhet och sprödhet. Testresultaten visar att acetylerad björkplywood har likvärdiga mekaniska egenskaper som omodifierad. Vid förhöjd RF har acetylerad björkplywood mer stabila mekaniska egenskaper jämfört med omodifierad björkplywood. Acetylerad björkplywood är dock sprödare.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2023. p. 42
Series
TRITA-ABE-DLT ; 2317
Keywords
Birch plywood, wood modification, acetylation, in-plane mechanical properties, load-to-face grain angle, moisture effect, Björkplywood, trämodifiering, acetylering, mekaniska egenskaper i planet, belastningsriktning, klimategenskaper
National Category
Civil Engineering
Research subject
Civil and Architectural Engineering, Building Materials
Identifiers
urn:nbn:se:kth:diva-326198 (URN)978-91-8040-537-9 (ISBN)
Presentation
2023-05-24, M108, Brinellvägen 23, KTH Campus, videolänk https://kth-se.zoom.us/j/66672066712, Stockholm, 10:00 (English)
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Supervisors
Note

QC 20230503

Available from: 2023-05-03 Created: 2023-04-26 Last updated: 2023-12-07Bibliographically approved

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Wang, YueWang, TianxiangCrocetti, RobertoWålinder, Magnus

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