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Old 07-11-2011, 03:04 PM   #1
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Expanding explosives


I started a job with a jackhammer, to demolish a large concrete deck, and it's just too damn hot out this year to do that by hand. I looked at the mini excavators but they are very expensive to rent.

Then I started thinking, in mines they sometimes use a special agent where you drill a hole, put the stuff in, add water, and it expands, cracking the rock. I'm sure it would work for cement.

Anyone know anything about this kind of stuff and where I could get it? The nice thing with this is I could use my own hammer drill to make the holes and do it spur of the moment one there's a day it's not too hot out.

Just wondering if this stuff is something a DIY can actually buy and if it would be affective. I'd use this in conjunction with a sledge hammer and metal cut off wheel for the rebar.

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Old 07-11-2011, 03:11 PM   #2
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one brand I found is called crackamite.

http://www.crackamite.com/

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Old 07-11-2011, 03:14 PM   #3
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I found that too, just can't seem to find anything about pricing or ordering.
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Old 07-11-2011, 03:23 PM   #4
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Good gravy, if you are going to drill that many holes just get two or three hydraulic jacks, jack the edge of the slab up and pop it a few times with a sledge hammer, it will crack.
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Old 07-11-2011, 03:29 PM   #5
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Looks like Crackamite is only in India. Found this site with an 800 number in the U.S. http://www.dexpan.com/index.aspx Even has prices and looks like you can order on-line. Credit cards accepted. If you get some, be sure to post your results.
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Old 07-11-2011, 03:38 PM   #6
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We worked on a home recently where the excavator encountered a lot of huge rocks. Started with a jack hammer on the track hoe, and eventually they finished using the silent explosives. I was not impressed with the product. They drilled a ton of holes, injected the stuff, then came back the next day and still had to use jack hammers.
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Old 07-11-2011, 03:53 PM   #7
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Quote:
Originally Posted by jiju1943 View Post
Good gravy, if you are going to drill that many holes just get two or three hydraulic jacks, jack the edge of the slab up and pop it a few times with a sledge hammer, it will crack.
The thing with the jack hammer (your way would not work with my slab because it's secured to the house) is I have to rent it, and do it all that day or at least in a few consecutive days (don't get those often) or it gets expensive, if I drill holes I can just drill them at my own leisure when it's not as hot out, or even at night (though it might be kinda loud).

Last edited by Red Squirrel; 07-11-2011 at 03:55 PM.
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Old 07-11-2011, 03:54 PM   #8
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Quote:
Originally Posted by Maintenance 6 View Post
Looks like Crackamite is only in India. Found this site with an 800 number in the U.S. http://www.dexpan.com/index.aspx Even has prices and looks like you can order on-line. Credit cards accepted. If you get some, be sure to post your results.
Cool, I'll check that out, thanks.
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Old 07-11-2011, 03:56 PM   #9
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I'm curious the results...
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Old 07-11-2011, 03:57 PM   #10
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Yeah, Dexpan. Never used it, but there was a thread on it a while back.

Concrete Demolition
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Old 07-11-2011, 03:58 PM   #11
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Dexpan expanding mortar

http://www.amazon.com/dp/B000BRPHQ4/ref=nosim/kkorg-20
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Old 07-11-2011, 04:09 PM   #12
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Amazon.ca does not have it but guess I can still order from the .com, I'll just have to pay the border taxes. I'll have to ensure I order the right amount and make it worthwhile. Border taxes are usually about 100-200 bucks.

I will drill the holes first though, just to see how much of a job that is. My bit always slips in the drill chuck making it harder, I need to figure out a solution for that. I'm wondering if I should buy a bigger drill, like a 1 inch chuck instead of 3/4.
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Old 07-11-2011, 04:10 PM   #13
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Quote:
Originally Posted by Maintenance 6 View Post
If you get some, be sure to post your results.
And if you can't, have a next of kin post for you.
I see no down side to this plan. None what so ever.
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Old 07-11-2011, 04:12 PM   #14
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Quote:
Originally Posted by Blondesense View Post
Yeah, Dexpan. Never used it, but there was a thread on it a while back.

Concrete Demolition
I remember the thread from not too long ago. The stuff worked fast and well. Hope you can find it. It had great pictures.
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Old 07-11-2011, 04:13 PM   #15
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Quote:
Originally Posted by Red Squirrel View Post
Amazon.ca does not have it but guess I can still order from the .com, I'll just have to pay the border taxes. I'll have to ensure I order the right amount and make it worthwhile. Border taxes are usually about 100-200 bucks.

I will drill the holes first though, just to see how much of a job that is. My bit always slips in the drill chuck making it harder, I need to figure out a solution for that. I'm wondering if I should buy a bigger drill, like a 1 inch chuck instead of 3/4.
Hammer drill might help? Do you have tool rental place? Ask them. Strikes me you might be better off renting something you might not use often again?

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