3910 KB51 KB201320262026Humar, MihaKeržič, EliKopač, LukaLesar, BoštjanLevanič, Jakaštevilka:140str. 45-58DOI:10.20315/ASetL.140.4ISSN:2335-3112COBISSID_HOST:304188675URN:URN:NBN:SI:doc-R88UN0D3enBiotehniška fakulteta, Oddelek za gozdarstvo in obnovljive gozdne vireBiotehniška fakulteta, Oddelek za lesarstvoGozdarski inštitut Slovenije, založba Silva SlovenicaActa silvae et ligniµXRF-analizabakrovi zaščitni pripravkicopper-based preservativeshiperspektralno oslikovanjehyperspectral imagingmicro-XRF analysisrazkroj lesastaranje lesawood degradationwood weatheringIntegrated imaging approaches for evaluating long-term weathering of wood| a case study of façade elements| Integrirani pristopi, ki temeljijo na oslikovanju za vrednotenje staranja lesa, izpostavljenega vremenskim vplivom: študija primera fasadnih elementov|Wood is a widely used natural construction material, particularly in façade applications, where it is exposed to various abiotic and biotic degradation factors. This study investigates the effects of long-term weathering on a silver fir (Abies alba) façade element exposed outdoors for approximately 30 years under use class 3.1 conditions. The material had been treated with a copper–chromium-based preservative prior to installation and remained unmaintained during its service life. A comprehensive analytical approach was applied, including microscopy, density measurements, surface roughness analysis, contact angle determination, µXRF spectrometry, hyperspectral imaging, and FTIR spectroscopy. The results indicate that degradation was primarily limited to the outer 1–2 mm of the wood, where reduced density, increased roughness, and significant chemical changes were observed. Hyperspectral imaging enabled spatially resolved detection of chemical alterations, while µXRF revealed the redistribution and persistence of copper and chromium within the wood structure. No structural fungal decay was detected; however, surface colonisation by staining fungi was evident. The combined methodology proved highly effective for the non-destructive assessment of wood degradation and provides valuable insights into the long-term performance of treated wood in exterior applicationsLes je široko uporabljen naravni gradbeni material, zlasti za fasade, kjer je izpostavljen različnim abiotskim in biotskim dejavnikom razkroja. Ta študija obravnava vplive dolgotrajnega staranja na fasadni element iz bele jelke (Abies alba), ki je bil približno 30 let izpostavljen zunanjim razmeram v pogojih razreda uporabe 3.1. Material je bil pred vgradnjo zaščiten s sredstvom na osnovi bakra in kroma in med uporabo ni bil dodatno vzdrževan. Uporabljen je bil celosten analitski pristop, ki je vključeval mikroskopijo, merjenje gostote, analizo hrapavosti površine, določanje kontaktnega kota, µXRF- spektrometrijo, hiperspektralno oslikovanje ter FTIR-spektroskopijo. Rezultati kažejo, da je bila razgradnja omejena predvsem na zunanji sloj lesa debeline 1–2 mm, kjer so bile zaznane zmanjšana gostota, povečana hrapavost in izrazite kemijske spremembe. Hiperspektralno oslikovanje je omogočilo prostorsko razločeno zaznavanje kemijskih sprememb, medtem ko je µXRF razkril prerazporeditev ter obstojnost bakra in kroma v strukturi lesa. Strukturnega glivnega razkroja ni bilo mogoče zaznati, vendar je bila opazna površinska kolonizacija z glivami modrivkami. Kombinirana metodologija se je izkazala kot zelo učinkovita za nedestruktivno oceno degradacije lesa ter ponuja pomemben vpogled v dolgoročno delovanje zaščitenega lesa v zunanjih razmerahTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaGozdarski inštitut Slovenije