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Small-scale tests with adhesive bonds with CLT, GLTand finger joints
RISE Research Institutes of Sweden, Bioeconomy and Health, Material and Surface Design.
RISE Research Institutes of Sweden, Safety and Transport, Fire and Safety.
Tallinn University of Technology, Estonia.
RISE Research Institutes of Sweden, Safety and Transport, Fire and Safety.ORCID iD: 0000-0002-8001-401x
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2022 (English)Report (Other academic)
Abstract [en]

Wood construction is growing rapidly and provides a substantial contribution to the development of a more sustainable construction sector. Several modern wood-based building systems are developed with a focus on tall wooden houses and industrial production, where glued products are an important part. Fire safety is important, but the adhesive properties in fire conditions are not fully understood. This applies in particular to new adhesive systems but also to existing ones that exhibit poor load carrying capacity in a fire. The problem has been noted by the FSUW (Fire Safe Use of Wood) global network, which formed a sub-group of “Glue-line failure of engineered wood products” with representatives from Australia, NZ, Canada, USA, France, Italy, Switzerland, Sweden, and Germany. The global network has gathered knowledge and experience from known cases of fire testing of glued wood components (especially glulam, finger joints, and CLT) and has defined research needs. The results highlighted by this group relate to the delamination of glued bonds in a fire which can cause increased charring of glued wood products, especially for CLT. The results show that the temperature during standard fire testing increases continuously without cooling phase and with delamination of CLT until a collapse of the structure occurs. Thicker CLT may be required to reduce delamination risks or to protect the wood material. This can lead to increased costs and greater weight of the construction as well as reduced possibility of using visible wood. Therefore, it is of the utmost importance to find methods for evaluating the adhesive bond properties in a fire. The hypothesis is that different adhesive systems have different behaviour in fire, and especially that delamination behaviour can be avoided by choosing a suitable adhesive system. The best method for the evaluation of fire delamination is a full-scale test, but considering the high costs of such full-scale tests, a smaller-scale test needs to be developed. The intention of FIRENWOOD project is that such small-scale methods should give the same results as full-scale tests. A new, smaller-scale method for classifying adhesives concerning fire properties would also simplify the planning of full-scale tests. In Work Package 3 of FIRENWOOD project, some small-scale fire testing methods for adhesive bonds were evaluated at RISE, and this report includes results from small-scale fire tests of adhesive bonds in finger joints, CLT and GLT. The report is organized in three chapters based on the three different products tested. The common for all three tests was that the same eleven adhesive systems were used in all adhesive bonds.

Place, publisher, year, edition, pages
2022. , p. 26
Series
FIRENWOOD D3.3
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:ri:diva-61180ISBN: 978-91-89757-12-7 (electronic)OAI: oai:DiVA.org:ri-61180DiVA, id: diva2:1711912
Note

The FIRENWOOD project is supported under the umbrella of ERA-NET Cofund ForestValue byGermany (Federal Ministry of Food and Agriculture (BMEL); Agency for Renewable Resources (FNR)project number FKZ 2219NR120), Sweden (The Swedish Research Council for Environment,Agricultural Sciences and Spatial Planning (FORMAS); Swedish Energy Agency (SWEA); SwedishGovernmental Agency for Innovation Systems (Vinnova) project number 2018-04989) and Norway(Research Council of Norway (RCN) project number 298587). ForestValue has received funding fromthe European Union's Horizon 2020 research and innovation programme under grant agreement No773324.

Available from: 2022-11-18 Created: 2022-11-18 Last updated: 2023-05-08Bibliographically approved

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