20.500.12556/RUL-396 Gorljivost termično modificiranega in z borovimi pripravki impregniranega lesa diplomsko delo - visokošolski strokovni študij Combustibility of thermally modified and with boron preparations of impregnated wood graduation thesis - higher professional studies Les je, kot naravni material, vnetljiv in gorljiv. Ker ga je zato treba ustrezno zaščititi proti gorenju, smo preizkušali najnovejše postopke termične modifikacije lesa ter impregnacijo z okolju prijaznejšimi sredstvi kot so borove učinkovine. Ugotoviti smo želeli, kakšna je gorljivost termično modificiranega lesa. Les smo impregnirali z 1, 5 ter 10 % vodno raztopino Topbora. Impregniran kot neimpregniran les smo nato še dodatno termično modificirali v vakuumu pri temperaturi 150, 170, 190, 210, 230 °C. Za testiranje gorljivosti lesa smo uporabili modificirano ameriško metodo ASTM: E69-50 (1965). Rezultati so pokazali, da so kontrolni vzorci v 4,28 min izgubili 75 % lesne mase. Pri modificiranem lesu pa smo najboljši rezultat zabeležili pri temperaturi modificiranja 210 °C ter 10 % vodno raztopino Topbora, kjer so vzorci v 4,16 min izgubili le 32 % mase. Ugotovili smo, da se gorljivost modificiranega lesa zniža samo z dodatkom Topbora. Pri neimpregniranem modificiranem lesu je odstotek izgube lesne mase nižji ali enak kot pri kontrolnih vzorcih. Wood is a natural material, inflammable and combustible material. Considering this fact it is necessary to utilise proper flame retardants. The latest procedures of thermal modification of wood and impregnation with environmentally friendly biocides such as boron compounds were tested. Our purpose was to find out the combustibility of thermally modified wood. Wood was impregnated with 1, 5 and 10 % Topbor based aqueous solutions. The impregnated so as not impregnated wood was then further thermally modified in the vacuum at 150, 170, 190, 210 and 230 °C. For testing, a modified American method ASTM E 69-50 (1965) was utilised. Control samples lost 75 % of wood mass in 4.28 min. At the modified wood, the best results are reported after modification of samples impregnated with 10 % Topbor aqueous solution at 210 °C, where the samples lost only 32 % of the weight in 4.16 min. It was found out that the burning behaviour of the modified wood was reduced only by the addition of boron. When not impregnated, the percentage of loss of wood mass is comparable to the control specimens. les gorenje modifikacija lesa bor gorljivost wood combustion wood modification boron combustibility true false false [R. Ramovš] Slovenski jezik Angleški jezik Diplomsko delo 2014-07-11 12:25:24 2014-07-11 12:25:24 2022-07-11 10:22:44 0000-00-00 00:00:00 2009 0 Ljubljana 0 IX, 63 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*841.1 1751945 vs_ramovs_rok.pdf vs_ramovs_rok.pdf 1 45B3EDE124F18A071C6EDE19389381D5 81b90c37a52676635fe98dc4da8148a3f805c5a540a10feff902ea8acfbdf336 5e90752b-a1b9-11eb-a523-00155dcfd717 20.500.12556/rul/c1d7a74f-bf65-4fc4-b7ca-6692f060e09a https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=132327 Biotehniška fakulteta 0 0 0