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Statične mehanske lastnosti starega konstrukcijskega lesa [Elektronski vir] : diplomsko delo = Static mechanical properties of old structural timber : B. Sc. ThesisŠkorjanc, JaniV diplomski nalogi smo preučili vpliv naravnega aerobnega staranja na strukturne, kemijske in statične mehanske lastnosti smrekovega (Picea abies Karst.) konstrukcijskega lesa. Z več objektov smo ... dendrokronološko datirali les s starostjo do 272 let. Vzorcem smo s FT-IR spektroskopijo kemometrično določali relativni delež hemiceluloz, relativni delež lignina ter stopnjo kristaliničnosti celuloze. Statično, 4-točkovno upogibno testiranje čistih laboratorijskih preizkušancev (10 mm × 7 mm × 170 mm, R × T × L) smo izvedli v suhi (20 °C / 20 %) in vlažni klimi (20 °C / 88 %). Ugotovili smo, da ima stari konstrukcijski les v primerjavi z recentnim lesom, nižji relativni delež hemiceluloz, medtem ko delež lignina ostaja na isti ravni. Pri nekaterih vzorcih starega konstrukcijskega lesa smo ugotovili tudi višjo stopno kristaliničnosti celuloze. Proces staranja ni vplival na upogibno trdnost in togost konstrukcijskega lesa, povišala pa se je variabilnost mehanskih lastnosti. Opazili smo, da je pri starem konstrukcijskem lesu specifični modul elastičnosti bolj odvisen od spreminjanja vlažnosti lesa (2,26 %/%) kot pri recentnem lesu (< 2,0 %/%).Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [J. Škorjanc], 2023Language - slovenianCOBISS.SI-ID - 166528003
Author
Škorjanc, Jani
Other authors
Straže, Aleš |
Čufar, Katarina
Topics
les |
konstrukcijski les |
staranje |
mehanske lastnosti |
wood |
structural timber |
aging |
mechanical properties
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Škorjanc, Jani | |
Straže, Aleš | 18149 |
Čufar, Katarina | 02937 |
Source: Personal bibliographies
and: SICRIS
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