Conference Editor
Jianshun Zhang; Edward Bogucz; Cliff Davidson; Elizabeth Krietmeyer
Keywords:
psychrometer, capillary pressure, moisture content, retention curve, porous building material
Location
Syracuse, NY
Event Website
http://ibpc2018.org/
Start Date
24-9-2018 1:30 PM
End Date
24-9-2018 3:00 PM
Description
Moisture retention curves describe the moisture storage property of porous building materials. Currently available experimental methods for measuring moisture retention curves are often demanding in equipment and moreover not always suited for the adsorption process in most of the capillary moisture content range. This paper proposes a novel and simple technique – the psychrometer method – and validates it by the tests on calcium silicate and ceramic brick. In this experiment the moisture content of the samples experiencing adsorption and desorption processes is determined gravimetrically, while the corresponding capillary pressures in the samples are measured with a chilled-mirror dew-point psychrometer. Comparisons are made with results from mercury intrusion porosimetry, pressure plate/membrane and desiccator tests. It is shown that this psychrometer method is simple and reliable for both adsorption and desorption processes for capillary pressures below -1·105 Pa. When the capillary pressure is around or above -1·105 Pa, the psychrometer method is no longer very accurate, and other experimental techniques should be employed.
Recommended Citation
Feng, Fredriksson, and Janssen. "Psychrometer method to measure the moisture retention curves of porous building materials in the full humidity range" In Healthy, Intelligent, and Resilient Buildings and Urban Environments, Syracuse, NY: International Building Physics Association, 2018.
DOI
https://doi.org/10.14305/ibpc.2018.be-4.05
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 4.0 International License.
Psychrometer method to measure the moisture retention curves of porous building materials in the full humidity range
Syracuse, NY
Moisture retention curves describe the moisture storage property of porous building materials. Currently available experimental methods for measuring moisture retention curves are often demanding in equipment and moreover not always suited for the adsorption process in most of the capillary moisture content range. This paper proposes a novel and simple technique – the psychrometer method – and validates it by the tests on calcium silicate and ceramic brick. In this experiment the moisture content of the samples experiencing adsorption and desorption processes is determined gravimetrically, while the corresponding capillary pressures in the samples are measured with a chilled-mirror dew-point psychrometer. Comparisons are made with results from mercury intrusion porosimetry, pressure plate/membrane and desiccator tests. It is shown that this psychrometer method is simple and reliable for both adsorption and desorption processes for capillary pressures below -1·105 Pa. When the capillary pressure is around or above -1·105 Pa, the psychrometer method is no longer very accurate, and other experimental techniques should be employed.
https://surface.syr.edu/ibpc/2018/BE4/5
Comments
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