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Author:Lipponen, Olli
Title:Mikrobien aineenvaihduntatuotteiden merkitys rakenteiden vaurioalttiudelle
On the sensitivity of building structural damage incurred by microbial metabolic products
Publication type:Master's thesis
Publication year:2014
Pages:85 + 17      Language:   fin
Department/School:Insinööritieteiden korkeakoulu
Main subject:Rakennusmateriaalit ja rakennusfysiikka   (IA3017)
Supervisor:Lü-Tervola, Xiaoshu
Instructor:Viljanen, Klaus
Electronic version URL: http://urn.fi/URN:NBN:fi:aalto-201406252228
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
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Location:P1 Ark Aalto     | Archive
Keywords:building physics
carbon dioxide
CO2
diffusion
diffusion coefficient
gypsum board
microbes
mold
CO2
diffuusio
diffuusiokerroin
hiilidioksidi
home
kipsilevy
mikrobit
rakennusfysiikka
Abstract (eng):The aim of this thesis was to examine the air composition in a microbial damaged structure and the sensitivity of building structural damage incurred by microbial metabolic products.
Facility for measuring diffusion coefficient of carbon dioxide (CO2) was applied in this thesis.
Diffusion coefficients of CO2 in four different building materials were measured and calculated based on stationary condition.
The diffusion coefficients of volatile organic compounds (VOCs) were calculated using the kinetic theory of gases.
Measurements were conducted on temperature, relative humidity, CO2 concentration and VOC concentration in the void air of experimental structure with microbial contaminated gypsum board.
During the experiment the level of CO2 concentration in structure was elevated artificially and remained stable and higher than the initial concentration.
Similar contaminated gypsum board was also performed in outdoor condition for comparison.
After the experiment the microbe species of both gypsum boards were determined and compared.
Their toxicity levels were measured.
The result showed that the diffusivity of CO2 in gypsum board was (0,92·10-6 ±0,01)·10-6 m2/s under+ 23°C temperature.
The corresponding values were (5,43·10-12 ±0,71)·10-12 m2/s for polyethene, (2,43·10-6±0,33)·10-6 m2/s for porous fiber board and (1,58·10-8 ±0,03)·10-8 m2/s for building paper.
According to the results, gaseous microbial metabolic products with low molar mass diffused faster than the compounds with high molar mass.
Compounds with lower molar mass had lower concentration inside the structure.
The microbes in the laboratory specimen were more toxic than the microbes in the outdoor specimen.
Abstract (fin):Työn tavoitteena oli selvittää mikrobivaurioituneen rakenteen ilman koostumus mikrobien aineenvaihduntatuotteiden osalta sekä aineenvaihduntatuotteiden merkitys rakenteiden vaurioalttiudelle.
Työssä sovellettiin laitteistoa hiilidioksidin (CO2) diffuusiokertoimen mittaamiseen.
Työssä mitattiin ja laskettiin hiilidioksidin diffuusiokerroin neljässärakennusmateriaalissa perustuen ajasta riippumattomaan tilanteeseen.
Haihtuvien orgaanisten yhdisteiden (VOC) diffuusiokertoimet laskettiin kineettisen kaasuteorian avulla.
Työssä mitattiin mikrobikontaminoituneen kipsilevyn sisältäneen koerakenteen huokosilman lämpötilaa, suhteellista kosteutta, CO2-pitoisuutta ja VOC-pitoisuutta.
Kokeen aikana huokosilman CO2-pitoisuutta nostettiin keinotekoisesti, minkä jälkeen CO2-pitoisuus jäi pysyvästi korkeammalle tasolle kuin alkupitoisuus.
Kokeen aikana pidettiin samalla tapaa mikrobikontaminoitunutta kipsilevyä ulko-olosuhteissa vertailunäytteenä.
Kokeen lopuksi kummankin kipsilevyn mikrobikasvustolle tehtiin mikrobianalyysi ja toksisuusmittaus.
Mittausten mukaan hiilidioksidin diffuusiokerroin oli kipsilevyssä +23 °C lämpötilassa (0,92 ±0,01)·10-6 m2/s.
Vastaavasti hiilidioksidin diffuusiokerroin polyeteenisessä höyrynsulkukalvossa oli (5,43 ±0,71)·10-12 m2/s, huokoisessa puukuitulevyssä diffuusiokerroin oli (2,43 ± 0,33)·10-6 m2/s ja rakennuspaperissa diffuusiokerroin oli (1,58 ±0,03)·10-8 m2/s.
Tulosten mukaan moolimassaltaan kevyet yhdisteet diffundoituivat raskaita yhdisteitä nopeammin.
Moolimassaltaan kevyet yhdisteet muodostivat rakenteeseen raskaita yhdisteitä alhaisemman pitoisuuden.
Koerakenteessa olleen kipsilevyn mikrobikasvusto oli ulko-olosuhteissa olleen kipsilevyn mikrobikasvustoa toksisempi.
ED:2014-08-03
INSSI record number: 49466
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