Conference Editor
Jianshun Zhang; Edward Bogucz; Cliff Davidson; Elizabeth Krietmeyer
Keywords:
liquid permeability, building material, semi-permeable membrane, hanging water column
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
The unsaturated liquid permeability is a crucial hygric property of porous building materials. Its direct measurement is very challenging however, because currently available experimental protocols are either demanding in test facilities, complicated in data processing, or limited in moisture content range. Inspired by the osmosis phenomenon, we study the possibility to apply semi-permeable membranes for directly measuring the liquid permeability of porous building materials. The key principle is studied profoundly and a simple experimental set-up is constructed. Trial tests on calcium silicate insulation and autoclaved aerated concrete are performed. Results show that the experimental set-up can be used to measure the liquid permeability, but strongly underestimates its value in its current form. Based on an in-depth analysis, we believe that the underestimation should be attributed to the pore clogging to the semi-permeable membrane due to the extremely high concentration of salt in the solution. Hence, in a future iteration, we will turn to unsaturated solutions with lower salt concentrations to alleviate the problem.
Recommended Citation
Feng and Hanssen. "Semi-permeable membrane experiment for unsaturated liquid permeability of building materials: potential and practice" 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-4.06
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 4.0 International License.
Semi-permeable membrane experiment for unsaturated liquid permeability of building materials: potential and practice
Syracuse, NY
The unsaturated liquid permeability is a crucial hygric property of porous building materials. Its direct measurement is very challenging however, because currently available experimental protocols are either demanding in test facilities, complicated in data processing, or limited in moisture content range. Inspired by the osmosis phenomenon, we study the possibility to apply semi-permeable membranes for directly measuring the liquid permeability of porous building materials. The key principle is studied profoundly and a simple experimental set-up is constructed. Trial tests on calcium silicate insulation and autoclaved aerated concrete are performed. Results show that the experimental set-up can be used to measure the liquid permeability, but strongly underestimates its value in its current form. Based on an in-depth analysis, we believe that the underestimation should be attributed to the pore clogging to the semi-permeable membrane due to the extremely high concentration of salt in the solution. Hence, in a future iteration, we will turn to unsaturated solutions with lower salt concentrations to alleviate the problem.
https://surface.syr.edu/ibpc/2018/BE4/6
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