Gorljivost termično modificiranega in z borovimi pripravki impregniranega lesa

diplomsko delo - visokošolski strokovni študij

Rok Ramovš (Author), Miha Humar (Reviewer), Franc Pohleven (Mentor)

Abstract

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.

Keywords

les;gorenje;modifikacija lesa;bor;gorljivost;

Data

Language:	Slovenian
Year of publishing:	2009
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[R. Ramovš]
UDC:	630*841.1
COBISS:	1751945
Views:	741
Downloads:	283
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Combustibility of thermally modified and with boron preparations of impregnated wood
Secondary abstract:	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.
Secondary keywords:	wood;combustion;wood modification;boron;combustibility;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Biotehniška fakulteta, Odd. za lesarstvo
Pages:	IX, 63 f.
Keywords (UDC):	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:	21637