Theses and Dissertations

Guangmei Cao

Issuing Body

Mississippi State University

Advisor

Wan, Hui.

Committee Member

Shmulsky, Rubin.

Committee Member

Zhang, Jilei.

Committee Member

Borazjani, Abdolhamid.

Date of Degree

5-4-2018

Document Type

Graduate Thesis - Open Access

Major

Sustainable Bioproducts

Degree Name

Master of Science

College

College of Forest Resources

Department

Department of Sustainable Bioproducts

Abstract

To provide fundamental information for the second generation of cross laminated timber manufacturing, wood sections that glued by different orientations were constructed and tested. To reveal adhesive differences, phenol resorcinol formaldehyde (PRF) and polyurethane (PU) adhesive were used and the gluelines were evaluated in accordance with different conditions for shear strength, wood failure, dimensional stability and delamination. A non-destructive testing method was applied to measure the dynamic modulus of elasticity (dMOE) change. The results showed that the radical wood section of lumber produced with the starsawn process had much less deformation and was more suitable for glueline. PRF had better performance than PU in terms of shear strength, dimensional stability, and delamination. Confocal microscopic pictures revealed that the tangential to tangential (TT) glueline showed the tendency of collapse, indicating a poor bond strength and therefore a poor glueline durability of TT glueline, especially when it was subject to wet conditions.

URI

https://hdl.handle.net/11668/16857

Comments

Dimensional-Stability||Radical||Tangential||Shear-Strength||Adhesive||Starsawn||Southern-Pine||Cross-Laminated-Timber

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