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Offline kerrTopic starter
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« on: July 12, 2010, 09:14:23 am »
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Would appreciate suggestions from experts, particularly those who have succeeded to penetrate and break this very hard steel-like cement rock. Our diggers used hard steel chisel ( made of tungsten carbide ) but it just bounced off. What tool could possibly do the job ? Anyone please. Thanks.

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Offline mfitzs70
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« Reply #1 on: July 12, 2010, 10:10:25 am »
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Can you drill instead of chisel?

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Offline kerrTopic starter
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« Reply #2 on: July 12, 2010, 10:49:29 am »
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thanks mfitz. really contemplating to try drilling, maybe with a jackhammer but have to be fitted with a compatible power generating set to run the drill because the dig site is some distance into the hinterland, far from power lines. . But I have second thoughts too when I read from other TH postings that even a jackhammer won't do the job. We  are quite at a loss which tool could really penetrate this very very hard cement. Hope some experienced TH out there could share there best options. Of course we don't want to dynamite it . . it could collapse the walls and cover up entirely the whole dig of 25 feet deep.

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Offline mfitzs70
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« Reply #3 on: July 13, 2010, 05:57:19 am »
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Drill and wedge has been done for years even without power. Could get a gas generator to run it.

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« Reply #4 on: July 13, 2010, 06:15:30 am »
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I think that is a natural stone,not a cement one nor concrete one..now a days, we have a high strength cement as much as 30 ksi (kips per square inch) which is 10 times the strength of an ordinary cement..which is still the hardest so far...any concrete can be drilled by ordinary tools..so what you have encountered there may be a hard stone. I suggest that you drill it with an electric hammer drill then pour expansive chemical to break it. However, you have to make several holes that are near to each other so that the cracks will be formed simultaneously as the chemical will expand...(Note:The expansive chemical I forget it..is available in the demolition industry where it is classified as non destructive method...)The oxygen will make it expand to crack even the hardest stone or concrete.

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« Reply #5 on: July 14, 2010, 09:44:23 am »
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Thanks ! Hopefully this  " expansive chemical"  might just be the right stuff. Will check this out. Thanks redflex.
hi there redflex !

Missed to ask how soon this " expansive chemical " works after application. thanks again.
hi there redflex!


Missed to ask how soon this " expansive chemical" works after application. thanks again.

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« Reply #6 on: July 14, 2010, 11:31:06 am »
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you can try betonamit  or similar product
 

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http://www.archerusa.com/nonexplosivesblastingdemolition/product_dexpan_imitations.html

 

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http://www.betonamit.net/Home.html

or ezebreak 

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http://www.micro-blaster.com/

if you need  help we have the know how and equipment there to joint venture with you

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« Reply #7 on: July 15, 2010, 10:38:12 am »
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thanks jlc.

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Offline jhondig
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« Reply #8 on: July 27, 2010, 11:51:40 pm »
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how would you like to try Sulfuric Acid instead,it can easily dissolve that kind of concrete,  saves you a lot of effort and time.

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« Reply #9 on: September 07, 2010, 06:03:46 am »
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Please e reminded that the stuff is not a cement but rather a rock say a pyrite which is also hard to break. The cement or to be correct ..the concrete has its own limit of 10 KSI (Kips per square inch). The Japanese military does not have the advanced knowledge of a high strength concrete at that time.

The expansive chemicals usually upon exposed to open air will expand itself and thereby creating simultaneously "push" along the small spaced drilled holes eventually cracking the surface of the rock.To be effective the holes should be drilled deep enough ang the line of drilled holes must be on the shorter side of the rock in order to initiate cracking faster.



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