Effects of Drying Conditions, Phase Transformations, and Carbonation Reactions on Measurements of Sorption Isotherms of Building Materials

2009 ◽  
pp. 45-45-10 ◽  
Author(s):  
Kenneth E. Wilkes ◽  
Jerry A. Atchley ◽  
Phillip W. Childs ◽  
Andre Desjarlais
Keyword(s):  
Phase Transformations ◽  
Building Materials ◽  
Sorption Isotherms ◽  
Drying Conditions

Effects of Drying Conditions, Phase Transformations, and Carbonation Reactions on Measurements of Sorption Isotherms of Building Materials

2007 ◽  
Vol 4 (8) ◽  
pp. 100459 ◽  
Author(s):  
Kenneth E. Wilkes ◽  
Jerry A. Atchley ◽  
Phillip W. Childs ◽  
Andre Desjarlais ◽  
P. Mukhopadhyaya ◽  
...  
Keyword(s):  
Phase Transformations ◽  
Building Materials ◽  
Sorption Isotherms ◽  
Drying Conditions

scholarly journals Volatile Compounds Originating from Mixed Microbial Cultures on Building Materials under Various Humidity Conditions

1998 ◽  
Vol 64 (8) ◽  
pp. 2914-2919 ◽  
Author(s):  
Anne Korpi ◽  
Anna-Liisa Pasanen ◽  
Pertti Pasanen
Keyword(s):  
Volatile Compounds ◽  
Microbial Activity ◽  
High Performance ◽  
Building Materials ◽  
Fungal Growth ◽  
Fungal Species ◽  
Microbial Cultures ◽  
Mixed Microbial Cultures ◽  
Drying Conditions ◽  
Dilution Plate Method

ABSTRACT We examined growth of mixed microbial cultures (13 fungal species and one actinomycete species) and production of volatile compounds (VOCs) in typical building materials in outside walls, separating walls, and bathroom floors at various relative humidities (RHs) of air. Air samples from incubation chambers were adsorbed on Tenax TA and dinitrophenylhydrazine cartridges and were analyzed by thermal desorption-gas chromatography and high-performance liquid chromatography, respectively. Metabolic activity was measured by determining CO2 production, and microbial concentrations were determined by a dilution plate method. At 80 to 82% RH, CO2 production did not indicate that microbial activity occurred, and only 10% of the spores germinated, while slight increases in the concentrations of some VOCs were detected. All of the parameters showed that microbial activity occurred at 90 to 99% RH. The microbiological analyses revealed weak microbial growth even under drying conditions (32 to 33% RH). The main VOCs produced on the building materials studied were 3-methyl-1-butanol, 1-pentanol, 1-hexanol, and 1-octen-3-ol. In some cases fungal growth decreased aldehyde emissions. We found that various VOCs accompany microbial activity but that no single VOC is a reliable indicator of biocontamination in building materials.

scholarly journals Measurement of Moisture Storage Parameters of Building Materials

10.14311/420 ◽  
2003 ◽  
Vol 43 (2) ◽  
Author(s):  
M. Jiřičková ◽  
R. Černý ◽  
P. Rovnaníková
Keyword(s):  
Building Materials ◽  
Mercury Intrusion Porosimetry ◽  
Pore Space ◽  
Sorption Isotherms ◽  
Ceramic Brick ◽  
Moisture Retention ◽  
Moisture Storage ◽  
Aerated Concrete ◽  
Silicate Ceramic ◽  
Median Pore

The moisture storage parameters of three different building materials: calcium silicate, ceramic brick and autoclaved aerated concrete, are determined in the hygroscopic range and overhygroscopic range. Measured sorption isotherms and moisture retention curves are then combined into moisture storage functions using the Kelvin equation. A comparison of measured results with global characteristics of the pore space obtained by mercury intrusion porosimetry shows a reasonable agreement; the median pore radii by volume are well within the interval given by the beginning and the end of the characteristic steep parts of the moisture retention curves.

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