<div dir="ltr"><div>Here's a quick time version of the cob demolition video. Sorry. I must have attached the wrong version.<br><br></div>Misha Rauchwerger<br></div><div class="gmail_extra"><br><br><div class="gmail_quote">
On Sun, Aug 25, 2013 at 10:51 AM, martin hammer <span dir="ltr"><<a href="mailto:mfhammer@pacbell.net" target="_blank">mfhammer@pacbell.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<font face="Arial"><span style="font-size:9pt">Thanks Misha. More good anecdotal information. <br>
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The attached movie didn’t play for me. Normally I can play .mov files. Don’t know if others had the same problem. Had a file size of only 4 kb. Can you look into this?<br>
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Martin<div class="im"><br>
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On 8/25/13 11:05 AM, "Misha Rauchwerger" <<a href="http://misha.rauchwerger@gmail.com" target="_blank">misha.rauchwerger@gmail.com</a>> wrote:<br>
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</div></span></font><blockquote><font face="Arial"><span style="font-size:9pt"><div class="im">Hi Marty, et. al.,<br>
<br>
I have some anecdotal information to share. I just did a small demolition of a window in a cob structure. I've attached a short video of some of the demolition. There was galvanized expanded metal lath on the underside and vertical faces of a header that was embedded in the cob. The window was constructed approximately 17 years ago. I was really impressed with the tenacity of the cob, especially to the horizontal underside of the header, which you can see in the video of me using a small jackhammer to remove it. Some old nails were also used for connection. With regards to corrosion, after 17 years, the lath had a minor amount of rust, but appeared to have stopped, looking superficial. There did not appear to be any difference in amount of corrosion on the lath just under a thin layer of plaster on the exterior face of the header, versus the corrosion on the interior lath. I have a feeling that once the cob dries, there is a minor amount of shrinkage away from the metal, so even if it is still mechanically attached, there is a small air space which limits the corrosion unless moisture is re-introduced to the lath/earth interface on a regular basis.<br>
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thanks for all your work on the subject. I'm excited to do further research with Art Ludwig with regards to FerroCob, as our scale model of a FerroCob house had incredible performance on our small testing jig. We'll keep you posted.<br>
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Misha Rauchwerger<br>
</div><a href="http://www.builtinbliss.com" target="_blank">www.builtinbliss.com</a> <<a href="http://www.builtinbliss.com" target="_blank">http://www.builtinbliss.com</a>> <br><div class="im">
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On Sat, Aug 24, 2013 at 1:39 PM, martin hammer <<a href="http://mfhammer@pacbell.net" target="_blank">mfhammer@pacbell.net</a>> wrote:<br>
</div></span></font><div class="im"><blockquote><font face="Arial"><span style="font-size:9pt">Hello all,<br>
<br>
Can anyone weigh in on the use of steel mesh in clay plaster, in terms of corrosion of the steel? In particular if it is susceptible to a higher rate of corrosion than steel mesh in lime or cement plaster (or what an expected service life might be). Laboratory tested evidence is especially welcome, but so is anecdotal evidence (pro or con).<br>
<br>
I know there has been concern expressed about this for many years. I’ve heard theory, but I haven’t seen hard evidence that it is actually a problem.<br>
<br>
I ask this in the context of a Strawbale Tutorial I am co-authoring for the World Housing Encyclopedia. The tutorial is meant as guide for constructing small houses in seismically active regions of the developing world. Thus the desire for a reinforced clay plaster as the in-plane lateral resisting system. Darcey Donovan has used nylon fishing net in her system with PAKSBAB in Pakistan (which was shake table tested) but I am looking to use other mesh materials where such fishing net might not be available. Metal mesh seems to be readily available in most of the developing world. (We are also considering natural fiber mesh, but these may have strength and degradation problems). <br>
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Thanks!<br>
<font color="#888888"><br>
Martin<br>
</font><br>
PS – I’ve copied my colleague, Dmitry Ozeryansky, PE <br>
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