diplomsko delo - visokošolski strokovni študij
Robert Sitar (Author), Primož Oven (Reviewer), Miha Humar (Mentor)

Abstract

Smrekovina in macesnovina spadata med tiste vrste lesa, ki se pri nas v obliki masivnega lesa najpogosteje uporabljajo kot gradbeni, konstrukcijski in stavbni les. Za takšen namen uporabe je poleg mehanskih lastnosti lesa zelo pomembna tudi naravna odpornost lesa. Znano je, da je smrekovina neodporna drevesna vrsta, medtem ko macesnovina spada v razred zmerno odpornih drevesnih vrst. Ker se pri obeh drevesnih vrstah mehanske lastnosti lesa izboljšujejo (povečujejo) z gostoto oz. z ožanjem branik, nas je zanimalo, kakšen vpliv ima pri teh 2 lesnih vrstah širina branik na naravno odpornost lesa in hkrati tudi na delež vsebnosti ekstraktivov, katerim na splošno predpisujemo največji vpliv na naravno odpornost lesa. Te vplive smo ugotavljali v skladu s standardom SIST EN 113. Izdelali smo vzorce lesa smreke in macesna z različnimi širinami branik in jih izpostavili 3 vrstam gliv razkrojevalk. Nekaterim vzorcem lesa smo pred izpostavitvijo 3 glivam razkrojevalkam z ekstrakcijo izločili ekstraktive in tako poskušali določiti delež ekstraktivov za posamezen razred širin branik. Ugotovili smo, da širina branik obeh lesnih vrst nima vpliva na delež ekstraktivov v lesu. Z gravimetrično metodo smo po izpostavitvi glivam razkrojevalkam preučevali vpliv širine branik na naravno odpornost obeh lesnih vrst in ugotovili, da splošnega značilnega vpliva ni.

Keywords

les;smreka;macesen;širina branik;gostota;lesne glive;razkroj;izguba mase;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [R. Sitar]
UDC: 630*841
COBISS: 2141321 Link will open in a new window
Views: 366
Downloads: 99
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Other data

Secondary language: English
Secondary title: Influence of ring width on portion of extractives and natural durability of spruce and larch wood against wood decay fungi
Secondary abstract: Spruce and larch wood are wood species which are, in the form of solid wood most frequently used for building, construction so as lumber. Therefore besides the mechanical properties of wood, durability of wood is also very important. It is known that spruce wood is classified as non-durable, while larch wood is classified as moderately durable. Furthermore, at both tree species it is well known that mechanical properties and ring width (density) are correlated. The impact of ring-widths on natural durability of wood and ratio of extractives, which generally provide natural durability of wood, was researched. Therefore, wood samples of spruce and larch with different ring-widths were prepared. Some specimens were extracted prior the exposure to different wood decay fungi (SIST EN 113) to determine the portion of extractives for individual class of rings-widths. The results showed that ring-width in both wood had no effect on the portion of extractives in wood. Gravimetrically determined mass loses of the specimens showed that tree-ring widths of both tested species did not have the impact on fungal decomposition.
Secondary keywords: wood;spruce wood;larch wood;ring-width;density;wood fungi;decay;extractive;
Type (COBISS): Undergraduate thesis
Thesis comment: Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages: XII, 56 f., [5] f. pril.
ID: 11904371