Cob Re: lime:clay ratio

[elke]

Uwe,
Are you german?
This is definantly a german name.

Elke
-----Original Message-----
From: uwe <uweb at megalink.net.mx>
To: cob <coblist at deatech.com>
Date: Tuesday, October 27, 1998 11:38 AM
Subject: Re: Cob Re: lime:clay ratio


Hi all,

if you are talking about the final plaster, the EARTH/lime (not clay/lime)
ratio might be 3:1; that's ok. But if you are talking about stabilizing the
earth for cob or something similar, you hardly need more than 8% (by volume)
of lime. By the way, a lime plaster sticks to the earth (in any
presentation) much better than cement.

Uwe

----------
> At 10:24 AM 10/26/98 +0100, you (crtaylor) wrote:
> >
> >You can use a store bought hydrated type n bag lime, mix 1:3 lime:clay
> >(dry) and test some premade batches to see  Harry (CALXA) recommend
curing
> >small blocks at 140 degrees in the oven for 24 hours to get a 90 day dry
> >cure result example. try it before you get to the use stage, then decide,
> >it may provide more long term protectiion than straght cob.
> >
> Charmaine,
>
> Are you sure the lime/clay mix has no aggregrate (sand) in it?  I know a
> typical lime mortar mix is <1 lime:3 sand>, and I've used earth plaster
> mixes of <1 clay:3 sand> with good success (cob also about the same
> proportions, plus straw), but it seems to me that without some type of
> aggregate to go with the 3 parts clay (not just 1 part lime), you'll get
> some significant shrinkage cracks.  Any thoughts?