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.

Comments

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DOI

https://doi.org/10.14305/ibpc.2018.be-4.06

Creative Commons License

Creative Commons Attribution-Noncommercial 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-Share Alike 4.0 License.

COinS
 
Sep 24th, 1:30 PM Sep 24th, 3:00 PM

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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