Durability study of glulam timber under cyclic moisture loading

Uwizeyimana, Placide; Perrin, Marianne; Laügt, Emmanuel; Eyma, Florent

doi:10.1016/j.conbuildmat.2021.125715

Cited by 9 publications

(1 citation statement)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The improved water-tightness of materials is believed to enhance the durability of buildings, as excessive moisture content, particularly fluctuations in the moisture levels of wood materials, can result in repetitive shrinkage and swelling mechanisms. These mechanisms can weaken the material's mechanical strength over time [141,142]. The second most important was the sub-criterion ease of material use and/or application, with an SI value of 0.9167.…”

Section: Criteria and Sub-criteria Classificationmentioning

confidence: 99%

Prioritizing Indicators for Material Selection in Prefabricated Wooden Construction

Cabral,

Blanchet

2023

Buildings

View full text Add to dashboard Cite

Material selection in buildings profoundly affects project success, encompassing durability, maintenance, customer satisfaction, production systems, lifecycle, usage, environment, and costs. Yet, there is a need for further research on indicators for choosing materials in prefabricated buildings. Therefore, this study’s main objective was to identify the indicators (criteria and sub-criteria) for selecting materials for prefabricated wooden construction and, subsequently, categorize these criteria and sub-criteria based on the perspective of industry professionals. To achieve this goal, three phases were carried out. First, a literature review was conducted to identify potential criteria for choosing structural and envelope materials in wooden prefabricated buildings. Second, a pilot survey was conducted in Canada and the United States to classify the priority order of the criteria obtained from the literature based on professionals’ opinions. Finally, Monte Carlo simulations were conducted with different iterations (1000, 10,000, and 100,000) using the data obtained from the previous phase to improve decision-making and classification processes. For the indicators to select materials, the literature review identified seven main criteria: performance properties, green materials, energy efficiency, circular economy, site conditions and material logistics, standards, and social impact. These criteria contained a total of 25 sub-criteria. The pilot survey data analysis demonstrated that the performance properties, site conditions and material logistics, and social impact criteria were consistently prioritized. The critical sub-criteria identified were fire resistance, watertightness, local availability, occupant health, and safety and protection. For the Monte Calo simulations, the predictions aligned with the pilot study, enhancing the robustness of the results.

show abstract

Section: Criteria and Sub-criteria Classificationmentioning

confidence: 99%

Prioritizing Indicators for Material Selection in Prefabricated Wooden Construction

Cabral,

Blanchet

2023

Buildings

View full text Add to dashboard Cite

show abstract

Structural health monitoring of glulam structures: analysis of durability and damage mechanisms

Greffier,

Espinosa,

Perrin

et al. 2024

Eur. J. Wood Prod.

View full text Add to dashboard Cite

In today’s environmental context, the use of glulam or Glued Laminated Timber (GLT) as an alternative to conventional building materials could reduce the carbon footprint of engineering structures. However, this material is sensitive to outdoor exposure with moisture content variations inducing internal stresses and cracks and high moisture content increasing the risks of decay. This study therefore focuses on the development of a protocol to evaluate the effect of climatic conditions on the mechanical performance of the material. For this purpose, GLT samples were equipped with embedded sensors. Moisture and deformation sensors can accurately track wet-dry (W/D) cycles and their effects on deformation at adhesive joints. Samples are stored outdoors and mechanical tests are carried out after 6 months of aging. The results show an average reduction in flexural strength of about 10% compared to unaged specimens. Shear tests on the adhesive joints show a decrease in strength of more than 20%. The study of the fracture mechanisms also indicates a link between the type of fracture and the aging conditions of the specimens. These tests also validated a monitoring protocol that will allow, in the long term, to evaluate the impact of these cycles on the mechanical performance of GLT.

show abstract

Disrupted cellulose aggregation leads to the reduced mechanical performance of wood–adhesive interphase during freeze–thaw cycles

Cao

et al. 2022

Cellulose

View full text Add to dashboard Cite

The mechanical performance of wooden engineered composites facing the freeze-thaw cycles (FTCs) arises as an attention-worthy issue since the application of timber architectures in cold climates spreads. Here, we reported an investigation to reveal the losses of the mechanical performance of the wood-phenol formaldehyde (PF) adhesive interphase after the FTCs. Results revealed that PF adhesive was barely affected by the FTCs due to the low moisture content and rigid networks, whereas the mechanical properties of the cell wall in wood-PF interphase reduced signi cantly (more than 30%) after 5 FTCs at -40℃. Cracks were observed in the cell wall and compound middle lamella after FTCs. Further investigation into the crystal structure of the cell wall in the wood-PF interphase demonstrated that the FTCs disrupt the aggregations of cellulose macromolecules. The stresses caused by the phase transition of free water and the external hydrogen bonds formed between water and cellulose disrupted hydrogen bond networks in the cell wall. A plausible mechanism for the FTCs reducing the mechanical properties of the wood-PF bonds can be concluded as the cracks and weakened cell walls crippled the structural integrity of the wood-PF interphase, making it a fragile and stress-concentrated site when subjected to load.

show abstract

Durability study of glulam timber under cyclic moisture loading

Cited by 9 publications

References 18 publications

Prioritizing Indicators for Material Selection in Prefabricated Wooden Construction

Prioritizing Indicators for Material Selection in Prefabricated Wooden Construction

Structural health monitoring of glulam structures: analysis of durability and damage mechanisms

Disrupted cellulose aggregation leads to the reduced mechanical performance of wood–adhesive interphase during freeze–thaw cycles

Contact Info

Product

Resources

About