Re: KRS - artificial weathering

From: Eric Stevens (eric.stevens_at_sum.co.nz)
Date: 09/18/04 

Date: Sun, 19 Sep 2004 11:11:58 +1200

On Sat, 18 Sep 2004 06:42:05 GMT, "zolota" <zolota3@REMOVEshaw.ca>
wrote:

>
>"Eric Stevens" <eric.stevens@sum.co.nz> wrote in message
>news:evalk051svrvqch0um8ebgjhn2nt4ubn96@4ax.com...
>> On Fri, 17 Sep 2004 06:11:45 GMT, "zolota" <zolota3@REMOVEshaw.ca>
>> wrote:

   --- snip ----

>
>>>
>>>Despite what others say, a rock that had been in salt water would show no
>>>evidence of the salt later.
>>
>> I never said that. What I was trying to pint out that Martin's attempt
>> to induce frost cracking by using salt to create a freezing mixture is
>> fraught with practical problems which he doesn't really understand.
>
>Agreed. If you have heated a rock in a fire to 200 degrees, whether you
>quench it to 0 or -5 degrees is rather trivial.
>
>I decided to pust some ideas here to get feedback. Now I'll criticize
>myself. Until the invention of explosives mining could only be done in rock
>using one of few methods. If the rock is soft and a harder material is
>available, it can be broken mechanically. This includes bone or flint tools
>for scraping chalk out of tunnels in the search for flint nodules in
>paleolithic times. The Egyptians used copper chisels on limestone, Easter
>islanders used hammers on the volcanic rock. The advent of iron tools made
>this approach easier.
>
>If the rock was hard then fires were built to warm the rock, followed by
>quenching with water. The Egyptians used this method to mine gold in Nubia
>(the Sudan) and the Germans were still using it 400 years ago in Bavaria.
>The objective was to cause sudden shrinkage of the surface that resulted in
>chunks and slabs to spall off. I can't imagine being the person who throws
>the water and breaths the steam, but that was what slaves were for. Needless
>to say overdoing it with the KRS would have resulted in a bucket of road
>gravel. Still, alternate quenching with boiling water then ice water on the
>surface to be aged would rapidly produce the mechanical wear that years of
>winters would otherwise require for the same effect, both in terms of
>individual crystals falling out and of sharp edges being rounded. Again, I
>ask anyone to tell me how this action could be detected after the fact.
>

For a start, I would not expect it to evidence the surface and
subsurface chemical changes consistent with centuries of genuine
weather exposure.

Eric Stevens

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