Hygrothermal properties and behavior of concrete

Michael Hurd · Post by **Michael Hurd** » Mon Aug 03, 2009 7:27 am -1100

I read the paper on this subject on the website and have a question regarding how to actually model concrete based on the conclusions of this paper. The article states; "the concrete component should be subdivided into two layers: one where liquid transport is possible and the other one where moisture transport is limted to vapour diffusion (i.e. liquid diffusivitites are set to zero)."

How do I set the liquid diffusivities to zero?

Manfred Kehrer · Mon Aug 03, 2009 7:39 pm -1100

Go to the Dialog called "Layer/Material Data". On the right side at "Hygric Extension" are two function called "Liquid Transport Coefficient". Just delete all values for both functions, so that there is only one Element Left with Water Content= 0 kg/m³ and DWW and DWS = 0 m²/s.
If the "Generate" option is activated, just release it before.

Manfred

Michael Hurd · Post by **Michael Hurd** » Thu Sep 03, 2009 5:11 am -1100

Manfred, I set the diffusivities (for suction and redistribution) to zero as indicated in your last post and when I try to run the calculations I get an error message: "Material Function: Liquid Transport Coefficient, Suction - invalid water content". Is there something I need to do in addition to what you indicated to get the calculations to run?

Christian Bludau · Thu Sep 03, 2009 7:38 pm -1100

Hallo Michael,
this message may appear if you only delete the values out of the fields. Try to mark the line and press the delete-button on the right until only the first line is left, which says 0 - 0.
Christian

Michael Hurd · Post by **Michael Hurd** » Fri Sep 04, 2009 2:44 am -1100

Thanks Christian, the DWS and DWW fields would still have to be changed manually to a "0" value correct?

Christian Bludau · Fri Sep 04, 2009 2:54 am -1100

No, you can delete the line including the values. Only empty fields are not working.
Christian

Michael Hurd · Post by **Michael Hurd** » Fri Sep 04, 2009 3:02 am -1100

Christian, I meant when you get down to the remaining line if in that line you have to manually zero out the DWW and DWS values.

Daniel · Post by **Daniel** » Fri Sep 04, 2009 5:54 am -1100

this is correct

josephbeag · Post by **josephbeag** » Wed Oct 28, 2009 9:39 am -1100

[quote="Michael Hurd"]I read the paper on this subject on the website and have a question regarding how to actually model concrete based on the conclusions of this paper. The article states; "the concrete component should be subdivided into two layers: one where liquid transport is possible and the other one where moisture transport is limted to vapour diffusion (i.e. liquid diffusivitites are set to zero)."

Hi Michael,
What's the paper? Can you email it to me?
josephbeag@gmail.com

Thabks.
Joseph

Michael Hurd · Post by **Michael Hurd** » Fri Mar 26, 2010 9:02 am -1100

Joseph, sorry for not seeing your post until now - the name of the article is the subject of this post. You can find the article on the WUFI website under the "Literature" heading, once there go to "for other publications of IBP please refer to our general list of publications" general list of publications is a hyperlink that will take you to a list and you should be able to find it. It was published in 2008 by Kunzel, Holm and Krus.

WUFI