Vrednotenje relevantnih lastnosti lesenih lepljencev po dveh letih izpostavitve na prostem

Kovač, Žiga (avtor), Humar, Miha (mentor), Šega, Bogdan (komentor)

V diplomskem delu smo vrednotili spremembe lastnosti lesnih lepljencev po dveh letih izpostavitve na prostem. Lesni lepljenci so bili izpostavljeni na terenskem polju na Oddelku za lesarstvo. Preizkušance smo primerjali z rezultati izpostavitve po enem letu in neizpostavljenimi preizkušanci. Testirali smo preizkušance, izdelane iz lesa smreke, bukve in macesna. Preizkušanci so bili lepljeni z različnimi lepilnimi mešanicami (PVAc, PUR in MUF) in premazani z različnimi premaznimi sredstvi. V test smo vključili tudi termično modificiran les smreke in bukve. Lepljencem smo določali mehanske in površinske lastnosti in sicer upogibni modul elastičnosti, tlačno trdnost, strižno trdnost lepilnih spojev, razkroj in delaminacijo. Vrednosti upogibnega modula elastičnosti, tlačne trdnosti in gostote se po dveh letih niso pretirano spremenile. Večji padec vrednosti je bilo zaznati pri strižni trdnosti lepilnih spojev. Test delaminacije je pokazal, da dvoletna izpostavitev ni imela velikega vpliva na lepilni spoj.

• Jezik: Slovenski jezik
• Ključne besede: lepljenec, trdnost, izpostavitev, lepilo, premaz
• Vrsta gradiva: Diplomsko delo/naloga
• Tipologija: 2.11 - Diplomsko delo
• Organizacija: BF - Biotehniška fakulteta
• Založnik: [Ž. Kovač]
• Leto izida: 2023
• PID: 20.500.12556/RUL-145780
• UDK: 630*832.286:841.3
• COBISS.SI-ID: 152119555
• Datum objave v RUL: 14.05.2023

KOVAČ, Žiga, 2023, Vrednotenje relevantnih lastnosti lesenih lepljencev po dveh letih izpostavitve na prostem [na spletu]. Diplomsko delo. Ž. Kovač. [Dostopano 4 maj 2025]. Pridobljeno s: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=slv&id=145780

Sekundarni jezik

• Jezik: Angleški jezik
• Naslov: Evaluation of relevant properties of glued laminated timber after two years of outdoor exposure

Izvleček

In the thesis, we evaluated the changes in glued wood after two years of outdoor exposure. The samples were exposed in the work field of the Department of Wood Science and Technology, at the Biotechnical Faculty of the University of Ljubljana. After two years of exposure the samples were compared with unexposed samples. We tested spruce beech and larch wood samples, which were glued with different types of adhesive (PVAc, PUR and MUF) and coated with different protective coatings. Thermally modified larch wood was also included in the tests. In the thesis, we were concerned with the changing of the mechanical and visual properties of the samples. We ran tests to check the differences in flexural strength, compressive strength, sheer strength, decomposition and delamination. Measurements were performed at the Department of Wood Science and Technology, and the mechanical properties were tested with a ZwickRoell Z100 machine. Before starting the tests, we set three hypotheses which were assessed based on the results. The values of flexural modulus, compressive strength and density did not change significantly after two years. However, a larger decrease was observed in shear strength. The delamination test showed that two years of year exposure had no significant effect on the adhesive bond.

• Ključne besede: glulam, strength, exposure, glue, coating