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51 records – page 1 of 6.

Delamination Testing of CLT Panels: An Exploratory Study

https://research.thinkwood.com/en/permalink/catalogue2626
Year of Publication
2011
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Author
Casilla, Romulo
Pirvu, Ciprian
Wang, Brad
Organization
FPInnovations
Year of Publication
2011
Country of Publication
Canada
Format
Report
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Adhesive
Bond Quality
Delamination Test
Strength
Language
English
Research Status
Complete
Summary
A study was conducted with the primary objective of examining the efficacy of delamination test using cylindrical core specimens to assess the bond quality of cross laminated timber (CLT) products. A prototype coring drill bit was fabricated to prepare a cylindrical-shaped specimen, the height of which corresponds to the full thickness of the CLT panel. A secondary objective was to examine the effect of pressure, adhesive type, number of plies, and specimen shape on the delamination resistance of CLT panels. The wood material used for the CLT samples was Select grade nominal 1 x 6-inch Hem-Fir boards. Examples of three adhesive types were evaluated, which were designated as A, B, and C. The delamination tests used were as described in CAN / CSA O122-06 and EN 302-2. Cylindrical specimen extracted as core was found satisfactory as a test specimen type for use in delamination testing of CLT product. Its efficacy was comparable to that of a square cross-section specimen. The former is recommended as it can be extracted from thicker panels and from any location in the panel. It would also be more convenient to plug the round hole. Adhesive type had a strong effect on delamination resistance based on the two delamination tests used. Adhesive A exhibited the greatest delamination resistance, followed in decreasing order, by adhesives C and B. It should be noted that no effort was made to find the optimum CLT manufacturing parameters for each type of adhesive. Therefore the relative rankings of the adhesives tested may not be representative. However, for the purposes of this study, the different performance levels from the three adhesives are useful in providing insight into how the proposed delamination test responds to significant changes in CLT manufacturing parameters. Pressure used in fabricating the CLT panel showed a strong effect on delamination resistance as demonstrated for one of the adhesives. Delamination resistance decreased with decreasing pressure. The effect of the number of plies in the CLT panel was dependent upon the type of adhesive, and this was probably related to the adhesive’s assembly time characteristic. These results provide support as to the effectiveness of delamination test in assessing the moisture durability of CLT panels. It was able to differentiate the performance in delamination resistance among different types of adhesives, and able to detect the effect of manufacturing parameters such as pressure and increased number of plies in CLT construction. The test procedure described in CAN / CSA O122-06 appears to be reasonable in the delamination resistance assessment of CLT panels for qualification and quality control testing. Based on the results of the study along with some background information and guidelines, delamination requirements for CLT panels are proposed. The permitted delamination values are greater than those currently specified for laminated and fingerjoined lumber products. This is in recognition of the higher bond line stresses when bonded perpendicular laminations (i.e. CLT) are exposed to the delamination wetting and drying cycles, as opposed to parallel laminations (i.e. glulam or fingerjoints).
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Air-Coupled Ultrasound Propagation and Novel Non-Destructive Bonding Quality Assessment of Timber Composites

https://research.thinkwood.com/en/permalink/catalogue13
Year of Publication
2012
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
General Application

Bending Strength of Glulam from Selected Malaysian Hardwood Timber

https://research.thinkwood.com/en/permalink/catalogue45
Year of Publication
2012
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Author
Mohamad, Wan
Ahmad, Zakiah
Yu Eng, Tan
Abd. Jalil, Ashari
Year of Publication
2012
Country of Publication
Switzerland
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
Beams
Topic
Mechanical Properties
Keywords
Bending
Delamination
Hardwood
Malaysia
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Summary
Malaysian government has already built the first glulam structure in Malaysia with the aim of demonstrating the potentialities of using indigenous hardwood timber for glulam. Since Malaysia possesses a vast variety of timber species, hence there is a nee...
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Damage Problems in Glued Laminated Timber

https://research.thinkwood.com/en/permalink/catalogue165
Year of Publication
2012
Topic
Serviceability
Material
Glulam (Glue-Laminated Timber)
Application
General Application
Author
Vanya, Csilla
Year of Publication
2012
Country of Publication
Poland
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Application
General Application
Topic
Serviceability
Keywords
Construction
Damage
Delamination
Loads
Manufacturing
Service Life
Stress
Tension
Language
English
Research Status
Complete
Series
Drewno
Online Access
Free
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Effects of ACQ Preservative Treatment on the Mechanical Properties of Hardwood Glulam

https://research.thinkwood.com/en/permalink/catalogue253
Year of Publication
2012
Topic
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
General Application
Author
Yang, Te-Hsin
Lin, Chih-Hsien
Wang, Song-Yung
Lin, Far-Ching
Publisher
Springer-Verlag
Year of Publication
2012
Country of Publication
Germany
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Application
General Application
Topic
Mechanical Properties
Keywords
Beech
Delamination
Hardwood
Maple
Modulus of Elasticity
non-destructive methods
Oak
Ultrasonic Wave
Tap Tone Method
Language
English
Research Status
Complete
Series
European Journal of Wood and Wood Products
ISSN
1436-736X
Online Access
Free
Resource Link
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Delamination Detection in a 90-Year-Old Glulam Block with Scanning Dry Point-Contact Ultrasound

https://research.thinkwood.com/en/permalink/catalogue114
Year of Publication
2013
Topic
Connections
Material
Glulam (Glue-Laminated Timber)
Application
General Application

Feasibility of Glued Laminated Timber Beams with Tropical Hardwoods

https://research.thinkwood.com/en/permalink/catalogue118
Year of Publication
2013
Topic
Connections
Mechanical Properties
Material
Glulam (Glue-Laminated Timber)
Application
General Application
Author
Bourreau, Damien
Aimene, Yamina
Beauchêne, Jacques
Thibaut, Bernard
Publisher
Springer
Year of Publication
2013
Country of Publication
Germany
Format
Journal Article
Material
Glulam (Glue-Laminated Timber)
Application
General Application
Topic
Connections
Mechanical Properties
Keywords
Delamination
Hardwood
Phenol-Resorcinol Formaldehyde
Shear
Testing
Tropical Climate
Language
English
Research Status
Complete
Series
European Journal of Wood and Wood Products
ISSN
1436-736X
Online Access
Free
Resource Link
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Nondestructive Evaluation of a 75-Year Old Glulam Arch

https://research.thinkwood.com/en/permalink/catalogue246
Year of Publication
2013
Topic
Serviceability
Material
Glulam (Glue-Laminated Timber)
Application
General Application
Author
Teder, Marko
Wang, Xiping
Year of Publication
2013
Country of Publication
United States
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
General Application
Topic
Serviceability
Keywords
Decay
Delamination
Modulus of Elasticity
Non-Destructive Evaluation
Stress Wave Timing
Wave Propagation
Strength
Resistance Micro-Drilling
Language
English
Conference
International Nondestructive Testing and Evaluation of Wood Symposium
Research Status
Complete
Notes
September 24-27, 2013, Madison, Wisconsin, USA
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Free
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New Attributes and Economic Analyses of Composite CLT and Value-Added Appearance-Based CLT

https://research.thinkwood.com/en/permalink/catalogue354
Year of Publication
2014
Topic
Cost
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
LSL (Laminated Strand Lumber)
LVL (Laminated Veneer Lumber)
Application
General Application
Author
Grandmont, Jean-Frédéric
Wang, Brad
Organization
FPInnovations
Year of Publication
2014
Country of Publication
Canada
Format
Report
Material
CLT (Cross-Laminated Timber)
LSL (Laminated Strand Lumber)
LVL (Laminated Veneer Lumber)
Application
General Application
Topic
Cost
Mechanical Properties
Keywords
Delamination
Hardwood
Softwood
Structural Composite Lumber
Economic Analysis
Structural Properties
Aesthetic Properties
Language
English
Research Status
Complete
Summary
The objective of this study was to examine new attributes and conduct economic analyses for composite CLT (CCLT) and value-added appearance-based CLT products manufactured with varying substitution of softwood lumber with structural composite lumber (SCL) and hardwood lumber. Incentives for including such materials could be aesthetic, structural and economic.
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Influence of Micro Structured Surface on the Bond Quality of Hardwood

https://research.thinkwood.com/en/permalink/catalogue454
Year of Publication
2014
Topic
Connections
Cost
Material
Glulam (Glue-Laminated Timber)
Application
General Application
Author
Lehmann, Martin
Volkmer, Thomas
Year of Publication
2014
Country of Publication
Canada
Format
Conference Paper
Material
Glulam (Glue-Laminated Timber)
Application
General Application
Topic
Connections
Cost
Keywords
Beech
Delamination
Hardwood
Melamine Urea Formaldehyde
Production Costs
Micro-structure
Language
English
Conference
World Conference on Timber Engineering
Research Status
Complete
Notes
August 10-14, 2014, Quebec City, Canada
Summary
The state of the art requires a closed waiting time of about one hour for the beech glulam production. This has a negative influence on the production costs. Micro structured surfaces showed good performance in combination with coatings. The authors have...
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Free
Resource Link
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51 records – page 1 of 6.