[GSBN] penetration of plaster in bales...

[caroline meyer white]

Your questions are exactly something I am about to do a little bit of testing on, here in Bath. I have been reading through what they had available of thesis's and dissertations on loadbearing straw. Everyone, except the Germans presenting at ESBG has done there testing on plastered straw, and yes, it is obvious that the strength and stifness of the plaster is governing the performance. Since most of the work has been done in Canada or the US, it was either lime/lime-cement/cement plaster, and with our fancying clay?clay-lime plaster in Denmark, I am still looking for more on that. 
 
But the question that was raised here, was then, what about the connection between the plaster and the straw, both initially, but also over time.. If the lower part of the wall had minor moisture damage, and say, the connection weakened over time, and therefore after some years you wouldn't have that strength as depending up on.
So we are making a few tests where we have different degrees of connection between straw and render, to see what results that will bring. 
 
In doing this little literature read-up, I thought about making a website or some other point of sharing research documents, -those which would be interested in offering it of course, so that when we need to see what has actually already been done, and what did they come up with, we could first go and have a look there.. A lot of the questions that are arising have already been answered.
 
Cheers
Caroline

Caroline Meyer White 

Friland 23 
8410 Rønde 
tlf + 45 40 76 1980 

New email which I am changing to: hojtpaastraa at gmail.com 

Kender du: engodsag.dk ? 

Eller paksbab.org ?

--- On Thu, 10/15/09, MattsMyhrman at aol.com <MattsMyhrman at aol.com> wrote:


From: MattsMyhrman at aol.com <MattsMyhrman at aol.com>
Subject: Re: [GSBN] penetration of plaster in bales...
To: GSBN at greenbuilder.com
Date: Thursday, October 15, 2009, 6:58 PM



In a message dated 10/14/09 1:02:13 PM, contact at lamaisonenpaille.com writes:



- some plastering techniques are able to shoot plaster up to 5 cm (2'')
into a dense bale wall as David Eisenberg told me was done for the wall
made for the thermal testing at Oak Ridge.


David needs to tell us more about the test wall.  I remember hearing that in some way or other it was poorly constructed.  For example, were the bales really dense?  Was each course settled into place by having some sturdy people stomp along the wall?  Was the penetration really this deep, and if so, was it only at the spots where the rounded ends of two bales butt up against each other, i.e., the holes that are usually stuffed with straw to prevent thermal nose-bleeding?

Matts (Butt What About...) Myhrman    

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