[Cob] Coblist Digest, Vol 10, Issue 52

[robert gepford]

see Calearth.org for a discussion of the problems with this idea....also
steel will not deteriorate sealed like this in a virtual airtight area,
ihave heard this proposed several times by people. also have seen hundred
year old reenforced walls torn down and reenforcing is perfect...main
problem comes when metal is run into dirt outside or below leval of
concrete. then wicked water over years can oxidize  the wire...

On Sat, Jun 23, 2012 at 2:00 AM, <coblist-request at deatech.com> wrote:

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> Today's Topics:
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>   1. key in the concrete beam (dhowell at pickensprogressonline.com)
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>
> ---------- Forwarded message ----------
> From: "dhowell at pickensprogressonline.com" <
> dhowell at pickensprogressonline.com>
> To: avjyoung at shaw.ca, coblist at deatech.com
> Cc:
> Date: Fri, 22 Jun 2012 09:25:38 -0400
> Subject: [Cob] key in the concrete beam
> Anna: "you could set big stones in the concrete as it gets poured"
>
> I've thought this same process. It seems like the best way to me. Embed
> large stones on the top of the concrete while it is still wet and let them
> sink in a little. This provides that rough surface for keying but doesn't
> cause a "low spot" so water can be trapped. It is my thoughts that since
> cob is porous and does transmit water, then even if it does dry out fairly
> quickly, the rust will eventually set in on the steel and completely
> deteriorate it. That causes gaps which will probably cave in under pressure
> and cause severe cracking. Stones embedded in wet concrete will not move,
> and cob built up around those stones will not move, so you have a product
> that will not move. Why is there such an infatuation with steel rebar in
> the building industry? I've seen in the past where a concrete bridge was
> torn down and they found that the rebar had completely rusted away. So,
> really this is a good material to use, even in concrete. Think about it;
> concrete absorbs water, but because it isn't porous it the water doesn't
> evaporate. If there is steel in there there will be a reaction!
> Damon
>
>
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-- 
Robert/Yutthaya Gepford