Vrednotenje relevantnih lastnosti lesenih lepljencev po enem letu izpostavitve na prostem.

Jelšnik, Jure (author), Humar, Miha (mentor), Šega, Bogdan (comentor)

V diplomskem delu smo ovrednotili relevantne lastnosti lesenih lepljencev po enem letu izpostavitve na terenskem polju Oddelka za lesarstvo. Za primerjavo smo testirali referenčne vzorce, ki niso bili izpostavljeni zunanjim dejavnikom. Testirali smo lepljence iz lesa macesna, smrekovine in bukovine ter masiven les smrekovine. Lepljenci so bili zlepljeni z različnimi lepili (PVAc, PUR, MUF) in površinsko zaščiteni (debeloslojni premaz, Silvanolin, Silvacera). Zanimala nas je sprememba mehanskih in vizualnih lastnosti preizkušancev. Razkroj smo ocenili vizualno po standardu SIST EN 252. Mehanske lastnosti smo določili z univerzalnim testirnim strojem Zwick Roell Z100. Vzorce izdelane iz lepljencev in masivne smrekovine smo obremenili na tlak, lepilne spoje preizkušancev pa smo obremenili na tlačni strig. Po enem letu na lesu z izjemo bukovine ni zaznati izrazitega razkroja. Pri bukovini smo opazili razkroj prve stopnje. Tlačna trdnost lesa se ni občutno poslabšala. Strižna trdnost lepilnih spojev se lepljencem, zlepljenim s PVAc lepili v povprečju poslabša pri vseh preizkušancih, razen pri lepljencih premazanih z debeloslojnim premazom Remmers.

• Language: Slovenian
• Keywords: lepljenec, naravno staran les, zaščita lesa, tlačna trdnost, strižna trdnost lepilnih spojev, gostota, PVAc, PUR, MUF, izpostavitev na prostem
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Publisher: [J. Jelšnik]
• Year: 2018
• PID: 20.500.12556/RUL-103375
• UDC: 630*841.4:630*832.286
• COBISS.SI-ID: 2944649
• Publication date in RUL: 16.09.2018

JELŠNIK, Jure, 2018, Vrednotenje relevantnih lastnosti lesenih lepljencev po enem letu izpostavitve na prostem. [online]. Bachelor’s thesis. J. Jelšnik. [Accessed 1 June 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=103375

Secondary language

• Language: English
• Title: Evaluation of relevant properties of glued laminated timber after one year of outdoor exposure.

Abstract

In this part, we evaluated relevant properties of glued laminated timber after one year of exposure at the field test site at Department of wood science and technology. For comparison, we tested reference samples that were not exposed to weathering. Glued laminated timber specimens were made of larch, spruce and beech wood. In addition non-glued spruce wood specimens were exposed as well. The glulams were glued with three type of adhesives (PVAc, PUR, MUF) and surface treated (thick layer coating, Silvanolin, Silvacera). We were interested in changing of the mechanical and visual properties of the specimens. The degradation was evaluated visually and accordance with the SIST EN 252 standard. Mechanical properties were determined using the Zwick Roell Z100, universal testing machine. Compressive strength, shear and density of the specimens were determined. After one year of exposure, with the exception of beech wood samples, degradation was not determined. The first grade of the degradation was determined at beech wood samples. One year of weathering resulted in loss of shear strength of glued laminated timber joints, glued with PVAc adhesives (with the exception of samples surface coated with surface coat), on the average declines.

• Keywords: glued laminated timber, natural aged wood, wood protection, compressive strength, shear strength of adhesive joints, density, PVAc, PUR, MUF, outdoor exposure