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2 records – page 1 of 1.

Development of Isocyanate-Free and Formaldehyde-Free Adhesives for CLT

https://research.thinkwood.com/en/permalink/catalogue2266
Topic
Mechanical Properties
Material
CLT (Cross-Laminated Timber)
Organization
TallWood Design Institute
Country of Publication
United States
Material
CLT (Cross-Laminated Timber)
Topic
Mechanical Properties
Keywords
Bonding
Plywood
Research Status
In Progress
Notes
Contact: Kaichang Li, Oregon State University
Summary
This project aims to develop a commercially-viable wood adhesive for CLT that is free of formaldehyde and isocyanates and possesses good cure speed properties. Li and his team have successfully developed adhesives for plywood manufacturing using abundant, inexpensive and renewable soy flour. This adhesive mimics the superior bonding properties of mussel additive proteins. Emission of hazardous air pollutants from plywood plants that use this adhesive has dropped 50-90 percent. Development of such an adhesive for CLT would address increasingly stringent air quality regulations in many places such as Oregon and California. The existing chemical formulation for the plywood adhesive will be adapted for use in a cold-pressing process. Specimens will be created at the OSU wood composites labs and first tested to verify conformance with the PRG320 product standard for CLT. Specimens passing the tests will be sent to the Energy Studies in Buildings Laboratory at the University of Oregon, Portland, where they will be conditioned and tested to determine emission characteristics.
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Innovative Lateral Systems for Mass Timber

https://research.thinkwood.com/en/permalink/catalogue2793
Topic
Seismic
Material
CLT (Cross-Laminated Timber)
MPP (Mass Plywood Panel)
Application
Shear Walls
Organization
TallWood Design Institute
Oregon State University
Country of Publication
United States
Material
CLT (Cross-Laminated Timber)
MPP (Mass Plywood Panel)
Application
Shear Walls
Topic
Seismic
Keywords
Post-Tensioned
Rocking Walls
Energy Dissipation
Mass Plywood
Experimental Tests
Seismic Force Resisting System
Research Status
In Progress
Notes
Project contacts are Arijit Sinha, Andre Barbosa and Barbara Simpson at Oregon State University
Summary
The results of this proposal will provide guidance on efficient design and analysis strategies for wood building construction including rocking/post-tensioned and pivoting spines, a next-generation seismic force resisting system, for improved performance, safety, sustainability, and economy. The use of wood in tall buildings is limitied by strength and stiffness considerations. The use of CLT and MPP shear walls, supplemented by energy dissipators may be able to aleviate this problem. Several knowledge gaps exist in terms of the performance of mass timber lateral force resisting systems (LFRS), interconnectivity and compatibility between the modules and LFRS-to-gravity system, and potential hybridization of structural materials for the gravity system and LFRS. The recent 2017 two-story shake table test is the only full scale dynamic on rocking CLT LFRS with energy dissipators. Importantly, since MPP panels are also a recent addition in the mass timber industry, no experimental data exist regarding the self-centering performance of post-tensioned MPP wall panels.
Resource Link
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