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demonstration of Blueys rock strength |
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26-Jan-2013 8:15:56 PM
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I'm building a retaining wall and made it about 70 mm too high:

No problems, the tops of the Sydney sandstone blocks disappeared with 2 hammer blows each with a cold chisel.
. I also have a rock I found on the road in the Grampians which took about half an hour. I cut a 20mm deep groove with a diamond saw and the put in cold chisels and pounded on them with a sledge hammer, no effect. I started drilling holes with an SDS bit which lasted about 20 seconds:-

I eventually made a mesh of crossing diamond saw cuts and hammered the top into razor-sharp shards. The grampians rock must be 50 times stronger.
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26-Jan-2013 8:30:39 PM
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So the Blue Mountains need to undergo metamorphosis (heating and/or application of pressure).
It might be a bit uncomfortable for us during this process! ;-)
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26-Jan-2013 8:44:50 PM
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yes, I think the geos call it induration.
Nowra rock is pretty much the same as blueys rock except that it's deepr, and therefore older
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26-Jan-2013 9:39:59 PM
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70mm too high?? Looks about 3m too low! Build it higher and you can boulder in your back yard.
On rock hardness a buddy and I are bolting a few sport climbs on our local sea cliffs. Steep overhung walls of Basalt are hard work.
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26-Jan-2013 11:06:50 PM
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On 26/01/2013 salty crag wrote:
>70mm too high?? Looks about 3m too low! Build it higher and you can boulder
>in your back yard.
>On rock hardness a buddy and I are bolting a few sport climbs on our local
>sea cliffs. Steep overhung walls of Basalt are hard work.
near warnambool?
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27-Jan-2013 10:11:32 AM
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Bit further west.
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27-Jan-2013 3:57:25 PM
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On 26/01/2013 mikllaw wrote:
>. I also have a rock I found on the road in the Grampians which took about
>half an hour. I cut a 20mm deep groove with a diamond saw and the put in
>cold chisels and pounded on them with a sledge hammer, no effect. I started
>drilling holes with an SDS bit which lasted about 20 seconds:-
>
That's unlike any Grampians rock I've ever seen - where did you get it from?? Almost looks like granite!
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27-Jan-2013 5:11:18 PM
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Looks like a floor tile.
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27-Jan-2013 10:59:05 PM
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ceasarstone bench top
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