Mehanske in sorpcijske lastnosti starega lesa impregniranega z baker-etanolaminskimi pripravki : diplomsko delo - visokošolski strokovni študij

Šprinzar, Andrej (author), Humar, Miha (mentor), Straže, Aleš (reviewer)

Les smreke je zelo pogosto uporabljen kot konstrukcijski material zaradi dobrih mehanskih lastnosti in dostopnosti. Vendar smrekovina spada med neodporne vrste lesa, zato jo je treba zaščititi, da ji podaljšamo življenjsko dobo v ogrožajočih okoljih. Tudi impregniran les je izpostavljen delovanju biotskih in abiotskih dejavnikov razkroja, zato nas zanima, kako se spreminjajo relevantne lastnosti lesa med uporabo. Ovrednotili smo mehanske in sorpcijske lastnosti vzorcev smrekovine, zaščitene z baker-etanolaminskimi pripravki. Vzorce smo pridobili iz dna in vrha telefonskega droga, ki je bil več let v uporabi v Budni vasi, ter iz ograje, ki je bila 10 let v uporabi v Kranjski gori. Tako smo lesu določili upogibno trdnost, tlačno trdnost in delež vodotopnih snovi. Najboljše mehanske lastnosti je v vseh 3 kriterijih izkazal vrh droga, saj je ta bil najmanj izpostavljen zunanjim dejavnikom; ni bil v stiku s tlemi, tako kot dno droga in ograja. Sorpcijske lastnosti smo določali z merjenjem kratkotrajnega kapilarnega navzema vode. Ta nakazuje na enega izmed parametrov, ki vpliva na odpornost lesa proti glivam. Višji kot je navzem vode, slabša je odpornost lesa. Najvišjo vodoodbojnost je izkazal vrh droga, kar je bilo tudi pričakovano. Ta je imel boljšo vodoodbojnost, tako od naravne kot eno leto starane smrekovine, zaščitene z baker-etanolaminskim pripravkom Silvanolin. Le malo slabšo vodoodbojnost je imela ograja, dno droga pa je bilo že precej razkrojeno in je bilo najmanj vodoodbojno.

• Language: Slovenian
• Keywords: smrekovina, zaščita lesa, bakrovi pripravki, mehanske lastnosti, tenziometer
• Work type: Undergraduate thesis
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [A. Šprinzar]
• Year: 2014
• Number of pages: VIII, 28 f.
• PID: 20.500.12556/RUL-117670
• UDC: 630*841
• COBISS.SI-ID: 2262409
• Publication date in RUL: 20.07.2020

ŠPRINZAR, Andrej, 2014, Mehanske in sorpcijske lastnosti starega lesa impregniranega z baker-etanolaminskimi pripravki : diplomsko delo - visokošolski strokovni študij [online]. Bachelor’s thesis. Ljubljana : A. Šprinzar. [Accessed 18 May 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=117670

Secondary language

• Language: English
• Title: Mechanical and sorption characteristics of old wood impregnated with copper-ethanolamine preparations

Abstract

Spruce wood is frequently used as a construction material due to good mechanical properties and accessibility. However, because of its susceptibility to decay, it is essential to protect the wood to extend its service life in extreme environments. Nevertheless, the impregnated wood is still exposed to biotic and abiotic factors. For this reason, we evaluated the changes of relevant properties, namely mechanical and sorption properties after the usage of spruce wood, protected with copper-ethanolamine biocidal products. Samples were obtained from the bottom and the top of a utility pole used for several years in Budna vas, and a fence that was 10 years in use in Kranjska Gora. Bending strength, compression strength and percentage of water-soluble substances were determined. In all the 3 criteria the top of the telephone pole demonstrated the best mechanical properties; it was the least exposed to degradation conditions. The sorption properties were determined with the measurement of the capillary uptake of water, which is one of the parameters indicating the susceptability of wood to the fungi. Higher the water absorption, lower the resistance to fungi. As expected the top of the pole exhibited the highest water-repellency, even higher than non-aged and one year aged spruce wood, both protected with Silvanolin, a copper-ethanolamine based preservative. The fence demonstrated just a little worse water-repellency, while the bottom of the pole was already degraded by fungi, and thus low water repellent.

• Keywords: spruce wood, wood protection, copper preservatives, mechanical properties, tensiometer