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An Exploratory Study of Composite Cross-Laminated Timber (CCLT) Made from Bamboo and Hemlock-fir Mix

https://research.thinkwood.com/en/permalink/catalogue2411
Year of Publication
2019
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
PSL (Parallel Strand Lumber)
Application
Wood Building Systems

Cross-Laminated Timber (CLT) in China: A State-of-the-Art

https://research.thinkwood.com/en/permalink/catalogue2108
Year of Publication
2019
Topic
Market and Adoption
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Li, Hao
Wang, Brad
Wei, Peixing
Wang, Libin
Publisher
Nanjing Forestry University
University of New Brunswick
Cellulose and Renewable Materials Division of Chinese Chemical Society
Year of Publication
2019
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Market and Adoption
Keywords
China
Research Status
Complete
Series
Journal of Bioresources and Bioproducts
Online Access
Free
Resource Link
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Development of Cross-Laminated Timber (CLT) Products from Stress Graded Canadian Hem-Fir

https://research.thinkwood.com/en/permalink/catalogue2595
Year of Publication
2020
Topic
Design and Systems
Material
CLT (Cross-Laminated Timber)
Author
Wei, Peixing
Wang, Brad
Li, Zhong
Ju, Ronghua
Year of Publication
2020
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Topic
Design and Systems
Keywords
Hem-Fir
Modulus of Elasticity
Modulus of Rupture
Stress-Graded Lumber
Research Status
Complete
Series
Wood Research
Summary
To explore the feasibility of hem-fir for CLT products, this work addressed the exploratory and pilot plant studies of hem-fir cross-laminated timber (CLT) products through mechanical tests. The hem-fir lumber was procured and then stress-graded based on dynamic modulus of elasticity (MOE). The resulted 5-ply prototype CLT products were then tested non-destructively and 3-ply pilot plant hem-fir CLT was tested destructively. The results showed that bending performance of hem-fir CLT panel can be predicted. Considering cost-competitiveness and end applications of hem-fir CLT products, the panel structure can be optimized based on the stress-graded data of hem-fir lumber.
Online Access
Free
Resource Link
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The Evaluation of Panel Bond Quality and Durability of Hem-Fir Cross-Laminated Timber (CLT)

https://research.thinkwood.com/en/permalink/catalogue1377
Year of Publication
2018
Material
CLT (Cross-Laminated Timber)
Author
Wang, Brad
Wei, Peixing
Gao, Zizhen
Dai, Chunping
Publisher
Springer Berlin Heidelberg
Year of Publication
2018
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Keywords
North America
Manufacturing
Hem-Fir
Bond Quality
Durability
Delamination Tests
Block Shear Tests
One-Component Polyurethane
Emulsion Polymer Isocyanate
Applied Pressure
Wood Failure Percentage
Research Status
Complete
Series
European Journal of Wood and Wood Products
Summary
To better use the second-growth wood resources in value-added applications, this work addressed the manufacturing aspects of cross-laminated timber (CLT) products from western hemlock (Tsuga heterophylla (Raf.) Sarg) and amabilis fir (Abies amabilis (Dougl.) Forbes) (or hem-fir) harvested from coastal British Columbia, Canada. Small CLT billets (nominal 610 mm×610 mm) were made to examine CLT bond quality and durability through block shear and delamination tests. Two types of adhesives, single-component polyurethane (PUR) and emulsion polymer isocyanate (EPI) and two critical applied pressure parameters (0.28 and 0.83 MPa) were adopted to manufacture hem-fir CLT. It was found that the adhesive type and applied pressure significantly affected wood failure percentage (WFP) and delamination of hem-fir CLT. When PUR adhesive was used, CLT made at 0.83 MPa pressure yielded significantly higher WFP and lower delamination than that made at 0.28 MPa pressure. The results demonstrated that despite the fact that hem-fir lumber is not particularly specified in the current North American CLT standard, it could be used for manufacturing CLT with the required panel bond quality.
Online Access
Free
Resource Link
Less detail