diplomsko delo
Povzetek
Hrastovino uvrščamo med najbolj trajne slovenske lesne vrste. V literaturi in tudi na osnovi praktičnih izkušenj smo opazili, da naravna odpornost hrastovine močno niha. Do sedaj je večina strokovnjakov naravno odpornost hrastovine povezovala z vsebnostjo ekstraktivov. Dokazali so, da imajo ekstraktivi velik vpliv na naravno odpornost, vendar samo s tem parametrom niso mogli pojasniti razlik glede obnašanja vzorcev. Da bi ugotovili, kako na odpornost hrastovine vpliva širina branik oziroma gostota, smo, v skladu s standardom SIST EN 113, izdelali vzorce iz hrastovih desk različnih širin branik in jih izpostavili 5 vrstam gliv. Vzporednim vzorcem smo določili delež ekstraktivov, dušika, lignina, kemijsko analizo (FTIR) in barvo. Iz gravimetrično določene izgube mase in mikroskopske analize razkrojenih vzorcev lahko sklepamo, da so bili hrastovi vzorci iz ozkih branik bolj dovzetni na glivni razkroj kakor vzorci iz srednje širokih in širokih branik. Odpornost hrastovine s povprečno širino branik 0,77 mm je primerljiva z naravno odpornostjo bukovine. Poleg tega naši rezultati potrjujejo, da je vpliv ekstraktivov na naravno odpornost hrastovine zelo pomemben.
Ključne besede
hrastovina;širina branik;gostota;lesne glive;razkroj;izguba mase;FTIR;
Podatki
Jezik: |
Slovenski jezik |
Leto izida: |
2008 |
Izvor: |
Ljubljana |
Tipologija: |
2.11 - Diplomsko delo |
Organizacija: |
UL BF - Biotehniška fakulteta |
Založnik: |
[B. Fabčič] |
UDK: |
630*841 |
COBISS: |
1659017
|
Št. ogledov: |
983 |
Št. prenosov: |
280 |
Ocena: |
0 (0 glasov) |
Metapodatki: |
|
Ostali podatki
Sekundarni jezik: |
Angleški jezik |
Sekundarni naslov: |
Influence of ring-widths on oak-wood natural durability against decay fungi |
Sekundarni povzetek: |
Oak-wood is considered as one of the most durable Slovenian domestic wood species. There were several reports about natural durability of products made of oak. In the past research on oak-wood durability, the most important factor influencing wood durability was assigned to extractives. It was proved that the extractives had a large influence on natural durability, nevertheless, just this parametre did not suffice to elucidate the differencesregarding the behaviour of samples. To find out if oak-wood durability can also be affected by ring-widths or density, oak-wood specimens were prepared from boards with different ring-widths, and exposed to 5 different fungal species, according to the EN 113 standard procedure. In parallel, extractives, nitrogen, lignin content, chemical properties (FTIR), and colour of the specimens were determined as well. From gravimetrically determined mass losses, and microscopy analysis of decayed specimens, it can be resolved that oak wood specimens with the narrowest rings are more susceptible to fungal decay than specimens made of average or wide ring-widths. Durability of oak-wood with average rings width of 0.77 mm is comparable to durability of beech-wood. Furthermore, our results indicate that influence of extractives on wood durability is important as well. |
Sekundarne ključne besede: |
oak wood;ring-width;density;wood fungi;decay;mass-loss;FTIR; |
Vrsta dela (COBISS): |
Diplomsko delo |
Komentar na gradivo: |
Univ. v Ljubljani, Biotehniška fakulteta, Odd. za lesarstvo |
Strani: |
XI, 77 f. |
Ključne besede (UDK): |
applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;agriculture and related sciences and techniques;forestry;farming;wildlife exploitation;kmetijstvo ter sorodne vede in tehnologije;forestry;gozdarstvo;forest products and their utilization;gozdni proizvodi in njihova uporaba; |
ID: |
21406 |