A method called the moment method has been developed for measuring the moisture diffusivity of porous building materials. An encased bar of the material is placed on two supports, one of them on a balance and the other on a fixed support. If there is a moisture gradient along the bar, a moisture flow will take place and cause a change of weight over time at the supports and cause a change of the moment of a force around each support. Knowing the moment change due to time we can calculate the diffusivity for the material. The method demands a balance with a high accuracy and very careful preparation of the sample to achieve the wanted moisture gradient and to avoid hysteresis. Measurements have been carried out for various building materials, some results are shown in this paper.
Presented at Thermal Performance of Exterior Envelopes of Whole Buildings X – December 2007
Units: SI
Citation: Thermal Performance of Exterior Envelopes of Whole Buildings X
Product Details
- Published:
- 2008
- Number of Pages:
- 6
- File Size:
- 1 file , 1.1 MB
- Product Code(s):
- D-BldgsX168
