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Re: GSBN:His Majesty's Lime Tests

as they say, something seems awfully out of wack. if you told me that the earth plaster out-performed by just a little bit and that the results were somewhat close, you might have gotten me to think about it and scratch my head. but that much difference I have trouble swallowing. after looking at the results, I realized that I just happened to have two plaster samples on hand, one that duplicated the 1 1 6 lime, cement, sand mix and the other a clay plaster with lots of straw that approximates the mix used in the tests. so as to avoid the next question, the lime in the sample was Chemstar. not having any sophisticated, nor unsophisticated lever arms hanging around the yard to exert pressure on the samples, I was forced to devise my own methadology. in that I had ruled out any possibility of an exact measurement, I grabbed my trusty hammer sized sledge and went to work. I'll give you three guesses as to what happened. didn't take me long to pulverize the clay sample, and as for the cement lime piece, it cracked into pieces, but it didn't do anything resembling what one might describe as being crushed.

I believe that clay plasters can give decent results, possibly better than might be expected, but if you try to tell me that they surpassed cement lime when it comes to compression, I would have to say that somebody ought to repeat them. in fact, since I still have a few duplicate samples lying around, I think I'll have another go at it tomorrow.

so what happened in the tests? your guess is as good as mine. I think John Glassford and Bob Bolles paid off Tim Kennedy, who is running the tests for Bruce, to do a little sabotage. I don't have any hard evidence, but with a little investigative work I would suspect we could dig up a little.


On Wednesday, September 18, 2002, at 08:12 AM, Rob Tom wrote:

on Tue, 17 Sep 2002
Bruce, King  of Sausalito ecobruce@... wrote:
re: straw bale test program

an update of the straw bale test program
has just been put up on the website


Your High!-ness and fellow Green Subjects;

Thank you for filling in we non-enginoidal plebes and peasants on your test results.

I haven't fully read the entire page containing the test results yet but I found the plaster test data to be (as Sergeant Schultz would say) "ve-e-e-e-ry interestink" (and surprising).

Who'da thunk that earthen plasters would out-perform the lime plaster samples in all of the compression tests ? Soitenly not me.

About the lime plaster in particular:

I am not familiar with the proprietary lime product used (Chemstar high calcium hydrated lime, presumably an Murrican product ?) but from the brief description of the recipe, it *sounds* very much as though the mixture was something akin to the pointing and setting mortar that a brick mason might use (ie where the lime content functions primarily as a plasticiser to make the Portland cement/sand mixture workable and the mortar becomes a weaker material than if the lime were omitted) as opposed to the reverted-back-to-limestone material that would result from a lime putty (made from slaked quicklime or carbide lime (which I gather to be similar ?)

I seem to recall one or more of the lime experts (I've copied one, Harry Francis, on this message in the hopes that he will offer some insights) mentioning that most bagged lime concoctions begin losing their carbonation potential from the moment they are manufactured and it goes downhill from there.

I'm wondering if this may have been the case for the test samples... ie the recipe used may not have been the optimal one to present lime's capabilities in a favourable light (ie similar to the ones which would be used to produce those miraculous historical lime plasters that we hear about the Euro-peein's having produced ?)

Can somebody 'splain eet to me ?

(I hope that the above won't be construed as nit-picking, but rather, just as a curious nit, wondering.)

 --- * ---
Robert W. Tom
Kanata, Ontario, Canada

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