Lastnosti kolov iz robinje po štirideset letih izpostavitve v vinogradu

diplomsko delo

Jernej Malik (Author), Boštjan Lesar (Reviewer), Miha Humar (Mentor)

Abstract

V sklopu obnove vinograda v zgornji Vipavski dolini so bili odstranjeni 40 let stari koli, izdelani iz lesa robinije (Robinia pseudoacacia). V nalogi smo primerjali njihov les s svežim lesom robinije iz bližnjega gozda. Na kolih smo vizualno ocenili razkroj v skladu s standardom SIST EN 252. Del kolov smo izolirali in jih pripeljali v laboratorij, kjer smo jih razrezali na ustrezno velike vzorce in lesu določili naravno odpornost v skladu s standardom SIST EN 113 ter odpornost na navlaževanje v skladu z metodologijo Meyer-Veltrup. Les smo analizirali z opremo za določanje dinamične sorpcije, določili smo kontaktni kot med vodo in lesom in posneli FTIR in XRF spektre. Na presekih smo izvedli analizo z digitalno mikroskopijo in na preseku ocenili razkrojenost. Z naštetimi poskusi smo prišli do ugotovitve, da je les po 40 letih uporabe kakovostnejši od sveže robinije. Vzrok za boljše obnašanje starega lesa v primerjavi z novim je predvsem počasnejša rast, ki posredno vpliva na višjo gostoto, višji delež ekstraktivov in navsezadnje na boljšo mehansko in biološko odpornost lesa.

Keywords

biološka odpornost;mehanske lastnosti;robinja;les;

Data

Language:	Slovenian
Year of publishing:	2024
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[J. Malik]
UDC:	630*84
COBISS:	205431811
Views:	32
Downloads:	13
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Properties of black locust posts after 40 years of use in a vineyard
Secondary abstract:	While renovating the vineyard in the upper Vipava Valley, we removed 40-year-old black locust (Robinia pseudoacacia) posts. The wood which was used for comparison purposes was obtained from a nearby forest. We visually inspected and assessed the posts for rot decay using the SIST EN 252 standard. We took sections from the posts and brought them to the laboratory, where they were cut into appropriately sized samples. In addition, natural durability, water exclusion efficacy, and the contact angle between water and wood were determined, and FTIR and XRF spectra were recorded. The cross-sections were analysed using digital microscopy, and the degradation rate was evaluated on the cross-sections. The experiments led us to conclude that after 40 years of use, the wood is still of better quality than recent Robinia wood. The reason for the better characteristics of old compared to new wood is primarily the former’s slower growth, which indirectly influences the higher density, the higher proportion of extractives, and ultimately the better mechanical and biological resistance of the wood.
Secondary keywords:	biological resistance;mechanical properties;black locust;wood;
Type (COBISS):	Bachelor thesis/paper
Study programme:	0
Thesis comment:	Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages:	1 spletni vir (1 datoteka PDF (X, 41 str.))
ID:	24910963