magistrsko delo
Urban Popelar (Author), Barbara Jeršek (Reviewer), Miha Humar (Mentor), Davor Kržišnik (Co-mentor)

Abstract

Plesni se pojavljajo na različnih gradbenih materialih. Namen raziskave je bil določiti pri katerih razmerah plesni vzkalijo in kateri materiali so najbolj dovzetni za njihovo rast. V magistrskem delu smo preučevali izbrane gradbene materiale; macesnovino, smrekovino, beljavo bora, OSB (angl. Oriented Strand Board, usmerjen iverna plošča) in mavčno ploščo. Na vzorce smo inokulirali konidije plesni vrst Penicillium expansum, Aspergillus niger in Sydowia polyspora in jih inkubirali pri treh relativnih zračnih vlažnostih (RH; 75 %, 85 % in 95 %) in dveh temperaturah (15 °C in 25 °C). Ocena 2 ali več po lestvici v Preglednici 3 nakazuje, da so na vzorcih pričele rasti plesni. Plesni vrst P. expansum in A. niger so hitreje vzkalile na vzorcih iz OSB in mavčne plošče. Pri nižjih relativnih zračnih vlažnostih plesni niso vzkalile na masivnih lesenih vzorcih. Plesni vrste S. polyspora so na lesenih vzorcih rastle hitreje, tudi pri nižji relativni zračni vlažnosti. Pri 25 °C so plesni hitreje ali enako hitro dosegle oceno 2 kot pri 15 °C na večini materialov in RH. Plesni so hitreje ali enako hitro dosegle oceno 2 tudi pri višji relativni zračni vlažnosti v primerjavi z nižjimi RH. Vsem materialom smo določili tudi kritične relativne zračne vlažnosti, ki povejo, pri katerih razmerah so plesni vzkalile. Za primerjavo s testom, kjer so bili vzorci izpostavljeni različnim klimam v posodah smo naredili tudi paste –test, pri katerem smo zgoraj omenjene plesni nacepili na gojišča PDA s primešanimi zmletimi materiali (50 % dodanega materiala glede na gojišče) in opazovali rast plesni, s tem smo izničili vpliv strukture materiala. Vpliv materiala je bil opazen pri gojišču z dodatkom beljave bora in plesnimi vrste A. niger in gojišču z dodatkom macesnovine in plesnimi vrste P. expansum.

Keywords

gradbeni materiali;rast plesni;relativna zračna vlažnost;temperatura;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [U. Popelar]
UDC: 691:582.282:581.5(043.2)
COBISS: 74522627 Link will open in a new window
Views: 247
Downloads: 50
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Other data

Secondary language: English
Secondary title: Influence of selected climate factors on mould growth on different building materials
Secondary abstract: Different building materials are susceptible to mold growth. The purpose of this research was to determine at which conditions molds grow and which materials present as favorable substrates. In this master thesis, we studied larch, spruce, pine sapwood, oriented strand board, and gypsum board. On building materials samples, we inoculated conidia of Penicillium expansum, Aspergillus niger, and Sydowia polyspora and incubated them at three different relative humidity levels (RH: 75 %, 85 %, 95 %) and two temperature levels (15 °C, 25 °C). Test samples were considered to have failed when the rating of a mold growth first reached 2 or higher based on the ratings in Table 3. P. expansum and A. niger grew fastest on oriented strand board and gypsum board samples. In lower relative humidities, growth was non-existent. S. polyspora grew faster on wooden samples, as well as at lower relative humidities. At 25 °C, molds achieved a rating of 2 faster or at the same time as at 15 °C in most of the conditions. The same applies to higher relative humidity. At 95 %, RH molds achieved a growth rating of 2 faster than at lower ones. All materials had been determined with critical relative humidities which show us, in which relative humidity intervals did the samples reach mold growth rating of 2. In addition, we also did a paste–test in which the aforementioned molds were inoculated on PDA medium with the addition of ground materials (50 % of added ground materials based on the medium). The influence of materials present was noticed on medium with added pine sapwood and A. niger and on medium with added larch and P. expansum.
Secondary keywords: building materials;mold growth;relative humidity;temperature;
Type (COBISS): Master's thesis/paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Biotehniška fak., Študij biotehnologije
Pages: XVI, 62 f., [41] f. pril.
ID: 13285817