On the application of buoyancy correction in the cup test measurement
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21720%2F24%3A00377183" target="_blank" >RIV/68407700:21720/24:00377183 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21110/24:00377183
Result on the web
<a href="https://doi.org/10.1016/j.buildenv.2024.111902" target="_blank" >https://doi.org/10.1016/j.buildenv.2024.111902</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.buildenv.2024.111902" target="_blank" >10.1016/j.buildenv.2024.111902</a>
Alternative languages
Result language
angličtina
Original language name
On the application of buoyancy correction in the cup test measurement
Original language description
The water vapour permeability of building materials is often measured using the cup method. One of usual corrections applied to the measured data is correction for the ambient air buoyant force acting on the cup assembly during weighing, the so-called `buoyancy correction’. Although the mathematical formula for the correction is well known, there are two distinct ways for its application to the cup test, which depend on the air permeability and flexibility of the tested sample. The magnitude of the correction can be twice different for the two approaches. This study, at first theoretically describes the use of buoyancy correction for cups with different samples. Then, presents results of the measurement of the air pressure inside cups with different samples which support the theoretical assumptions. Finally, based on numerical simulation, were established limits of use of the calculated buoyancy correction. Many samples of building materials are enough air permeable (air permeance higher than 1 x 10-10 kg/(m2sPa)) or flexible to maintain the air pressure and density in the cup close to ambient conditions. Cups with these samples can be corrected by applying the buoyancy correction to the volume of the air-impermeable parts of the cup assembly. If the air permeance of the sample is lower, the possible residual error after the application of correction can be ±3–7 mg/dm2 of the cup mouth area. The application of buoyancy correction can reduce the measurement time, especially for samples with a higher vapour resistance.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
20101 - Civil engineering
Result continuities
Project
<a href="/en/project/GA20-12941S" target="_blank" >GA20-12941S: Fungal growth on surface layer of solid wood under varying boundary conditions</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Building and Environment
ISSN
0360-1323
e-ISSN
1873-684X
Volume of the periodical
266
Issue of the periodical within the volume
7
Country of publishing house
GB - UNITED KINGDOM
Number of pages
15
Pages from-to
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UT code for WoS article
001321269300001
EID of the result in the Scopus database
2-s2.0-85204482747