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Ongoing Termite Studies on Cross Laminated Timber (CLT) Panels

https://research.thinkwood.com/en/permalink/catalogue2395
Year of Publication
2019
Topic
Serviceability
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
Stokes, C. Elizabeth
França, Tamara S.F.A.
Tang, Juliet D.
Year of Publication
2019
Country of Publication
United States
Format
Journal Article
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Serviceability
Keywords
Subterranean Termites
Mass Timber
Mass Loss
Laboratory Assay
Language
English
Research Status
Complete
Series
Proceedings, American Wood Protection Association
Summary
The development of composite mass timber products in the late 20th century continues to generate new developments in the design and production of multi-layer wood products in a wide variety of orientations and for a wide variety of uses. In the US Congress’ Agricultural Act of 2014, provisions were specified in Section 7310 to establish a series of priorities for research into the needs of the forestry sector. Specifically, collaborative research efforts into the increased use of CLT in support of the expansion of this portion of the forest products industry were addressed. Cross laminated timber products have been included in updates to national and international building codes, and new production facilities continue to come online. WoodWorks (2019) reports that 105 CLT based construction projects are in construction or completed, and 200 are in the design process. These projects are scattered across the United States, including in the highest areas of decay potential (Figure 1). Mississippi State University Department of Sustainable Bioproducts has several ongoing projects to investigate the durability of CLT under various conditions. These are partnerships with other investigators, primarily with USDA Forest Products Lab personnel, and are housed at both MSU Department of Sustainable Bioproducts facilities in Starkville, MS as well as Forest Products Lab locations in Madison, WI, McNeill, MS, and Saucier, MS. CLT is being tested in several different formats and in test pieces of different sizes. In an ideal situation, CLT panels would be tested at their full size, however, the time it would take to do so, and the logistics of handling pieces of typical size is prohibitive for rapid assessment of the product. Assessments of CLT to date have focused on examining the durability of CLT when exposed to hazards that occur in the high hazard zones of deterioration, such as fungi, termites, and natural weathering. This report describes the collaborative testing of CLT against termite infestation and damage.
Online Access
Free
Resource Link
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Utility of Image Software in Quantification of Termite Damage on Cross-Laminated Timber (CLT)

https://research.thinkwood.com/en/permalink/catalogue2344
Year of Publication
2019
Topic
Serviceability
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Author
França, Tamara S.F.A.
Stokes, C. Elizabeth
Tang, Juliet D.
Arango, Rachel A.
Year of Publication
2019
Country of Publication
United States
Format
Conference Paper
Material
CLT (Cross-Laminated Timber)
Application
Wood Building Systems
Topic
Serviceability
Keywords
Termites
Mass Loss
Image Analysis
Language
English
Conference
International Nondestructive Testing and Evaluation of Wood Symposium
Research Status
Complete
Summary
Cross Laminated Timber (CLT) is part of a new generation of engineered wood products that are now widespread across Europe, Australia, and Canada. As this trend is now growing in the United States, manufacturers are looking to expand the use of CLT into the North American market, which includes states located in the southeastern U.S. As this region is known to have an increased risk of termite attack, standards should be developed to evaluate termite damage on CLT products prior to extensive use of the product in this region. However, existing standard test methods cannot be applied directly to CLT specimens as current standard test sample sizes are too small to adequately represent CLT constructed materials. Therefore, larger sample sizes were examined to determine resistance of CLT products against termite attack. Large sample size made it difficult to evaluate termite damage using weight loss as a variable as termite damaged specimens showed relatively low weight loss values. The objective of this work was to examine the use of the image analysis software, ImageJ, in determining the extent of termite damage on CLT blocks. Results showed that evaluation of void volume percent could be used in conjunction with weight loss and visual rating to obtain a more accurate measurement of overall termite damage in CLT.
Online Access
Free
Resource Link
Less detail