Journal ArticleDOI
A mathematical model of mould growth on wooden material
Antti Hukka,Hannu Viitanen +1 more
TLDR
In this article, a mathematical model for the simulation of mould fungi growth on wooden material is presented, based on previous regression models for mould growth on sapwood of pine and spruce.Abstract:
A mathematical model for the simulation of mould fungi growth on wooden material is presented, based on previous regression models for mould growth on sapwood of pine and spruce. Quantification of mould growth in the model is based on the mould index used in the experiments for visual inspection. The model consists of differential equations describing the growth rate of the mould index in different fluctuating conditions including the effect of exposure time, temperature, relative humidity and dry periods. Temperature and humidity conditions favourable for mould growth are presented as a mathematical model. The mould index has an upper limit which depends on temperature and relative humidity. This limiting value can also be interpreted as the critical relative humidity needed for mould growth depending also on the mould growth itself. The model enables to calculate the development of mould growth on the surface of small wooden samples exposed to arbitrary fluctuating temperature and humidity conditions including dry periods. The numerical values of the parameters included in the model are fitted for pine and spruce sapwood, but the functional form of the model can be reasoned to be valid also for other wood-based materials.read more
Citations
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Journal ArticleDOI
Mycotoxin production by indoor molds.
TL;DR: The worst-case scenario for homeowners is produced by consecutive episodes of water damage that promote fungal growth and mycotoxin synthesis, followed by drier conditions that facilitate the liberation of spores and hyphal fragments.
Journal ArticleDOI
Moisture and Bio-deterioration Risk of Building Materials and Structures
Hannu Viitanen,Juha Vinha,Kati Salminen,Tuomo Ojanen,Ruut Hannele Peuhkuri,Leena Paajanen,Kimmo Lähdesmäki +6 more
TL;DR: In this paper, the demands on durability, energy balance, and energy balance of buildings are discussed, and several biological processes causing aging and damage to buildings are identified, such as natural aging of materials and excessive moisture.
Journal ArticleDOI
Mould growth on building materials under low water activities: Influence of humidity and temperature on fungal growth and secondary metabolism
TL;DR: In this article, the influence of relative humidity and temperature on growth and metabolism of eight microfungi on 21 different types of building material was investigated, including wood, wood composites and starch-containing materials.
Journal ArticleDOI
Review of mould prediction models and their influence on mould risk evaluation
Evy Vereecken,Staf Roels +1 more
TL;DR: In this article, an overview of the different existing models and the impact of the mold prediction model on the mould risk evaluation is presented. But the authors do not consider the exposure time of the mould growth.
Journal ArticleDOI
Prediction of Mould Growth by Hygrothermal Calculation
TL;DR: In buildings growing conditions for mould fungi can occur and cause fungus infestation as discussed by the authors, the danger for the occupants of dwellings lies in the production and spreading of pathogens (disease causing...
References
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Book
Transport processes in wood
TL;DR: In this paper, the effect of changes in pressure and temperature on relative Humidity of wood is investigated. But, the authors focus on the effects of these changes on the cell wall and not on the rest of the wood.
DissertationDOI
On the fungal defacement of interior finishes
TL;DR: A submitted manuscript is the author's version of the article upon submission and before peer-review as discussed by the authors, and the final published version features the final layout of the paper including the volume, issue and page numbers.
Book
Concise encyclopedia of wood & wood-based materials
TL;DR: The "Concise Encyclopedias of Materials Science and Engineering" as discussed by the authors is the only complete reference work in this rapidly developing field and includes a detailed overview of wood as a material.
Journal ArticleDOI
Modelling the time factor in the development of mould fungi - the effect of critical humidity and temperature conditions on pine and spruce sapwood
TL;DR: In this paper, three groups of models based on regression analyses of the critical time required for the growth of mould fungi on pine and spruce sapwood are presented, based on the results of exposing wood to different mould fungi in static humidity and temperature conditions.
Journal ArticleDOI
Cluster theory for water sorption in wood
TL;DR: A review of water interaction in cellulosic-systems, particularly wood, is presented in this paper, where the different states of water in these systems according to Nuclear Magnetic Resonance results, the BET, Dent, and Hailwood and Horrobin sorption isotherm models are discussed.