The effect of long and short term elevated temperatures on the behaviour of lap glued joints of load-bearing spruce elements
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26110%2F24%3APU150100" target="_blank" >RIV/00216305:26110/24:PU150100 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0143749623002555?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0143749623002555?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.ijadhadh.2023.103575" target="_blank" >10.1016/j.ijadhadh.2023.103575</a>
Alternative languages
Result language
angličtina
Original language name
The effect of long and short term elevated temperatures on the behaviour of lap glued joints of load-bearing spruce elements
Original language description
The paper deals with the behaviour of glued joints of wooden sections exposed to long and short term elevated temperatures. If the adhesive is not sufficiently temperature resistant, the glued joint may lose adhesion, which could result in a change in behaviour of the glued element cross-section when exposed to fire. Moreover, detailed knowledge of the behaviour of bonded joints under such long and short term thermal exposures will enable us to make informed decisions about the need for major structural intervention in structures post exposure. Three types of adhesives: phenol-resorcinol-formaldehyde (PRF), polyurethane (PUR) and emulsion polyisocyanate (EPI), commonly used in load bearing wooden structures, were chosen for the experimental work. Thermal analysis showed that the PRF and PUR were not sufficiently cured, especially the PRF. Calorimetric analysis showed the point at which thermal degradation of all three adhesives began, at 135 degrees C for EPI and at about 160 degrees C for PRF and PUR. Spruce lap joints, with a cross section of 40 x 48 mm, bonded using these adhesives were exposed to temperatures of 140 and 170 degrees C. To properly distinguish the effect of thermal exposure duration on the lap joints, different thermal durations were used: 20, 40, 60 and 80 min, plus 3 h and 1 day. The thermal resistance at each of the elevated temperatures was investigated through measurement of the reduction in tensile shear strength. At an elevated temperature of 140 degrees C there was no significant strength reduction in all of the tested adhesives, it was only a longer duration (1 day) that produced a reduction in the tensile shear strength properties (31.0% for PRF, 16.2% for PUR and 34.1% for EPI). A temperature of 170 degrees C produced a greater decrease in strength, a significant drop (more than 15%) was found for PRF and EPI after an exposure of 40 min; for PUR after 60 min. Moreover, the longer duration exposures to a temperature of 170 degrees C resu
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20400 - Chemical engineering
Result continuities
Project
<a href="/en/project/GA21-20645S" target="_blank" >GA21-20645S: Characterization of properties of modified isocyanate-based adhesives for structural engineered wood products</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
International Journal of Adhesion and Adhesives
ISSN
0143-7496
e-ISSN
1879-0127
Volume of the periodical
129
Issue of the periodical within the volume
February 2024
Country of publishing house
GB - UNITED KINGDOM
Number of pages
10
Pages from-to
„“-„“
UT code for WoS article
001125255800001
EID of the result in the Scopus database
2-s2.0-85177996888