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Silent Demolitions

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Author	Topic: Silent Demolitions
nbk2000 Moderator	posted February 16, 2000 01:34 PM I know this is not explosive, but it is useful for destroying concrete, something normally done with explosives or heavy equipment. The block in the picture is several feet thick and just broken to pieces. This stuff is called "BETONAMIT". It costs ~$60 per 5 kilo jar and is a powder or putty that you mix in water and pack into holes drilled in the concrete or rock that you want to destroy. If your patient you could use manual drills for silence, or perhaps silenced electric drills if your clever. It will break any size or thickness of material if you use enough. And the neat thing is its silent. Only thing you'd hear would be the cracking. No booms. It's not quick like explosives, takes hours in fact, but I'm sure that a slow, silent destruction of concrete would be useful. The instructions say that one 5 kilo can will break 1 cubic yard of reinforced concrete or up to 4 cubic yards of rock. BTW, 1 cubic yard of concrete weighs 4,000 pounds (2 tons). This stuff works like water when it's frozen. Since it has to expand, and nothing can compress water, it breaks whatever it's in. ------------------ "The knowledge that they fear is a weapon to be used against them."
HMTD Factory Frequent Poster	posted February 18, 2000 04:00 AM A bit like what Egyptian did to get their stones.
VeHeMT Frequent Poster	posted February 18, 2000 02:28 PM I believe fart was talking about using wood or something to do the same thing.
Ho ju Moderator	posted February 18, 2000 03:03 PM on the same note as egyptions the tomb raiders used to use the same concept. they would build a HUGE fire next to the wall of a pyrmid where they thought a doorway was. and when the wall got scorhing hot they threw cold vinager on it to crack it. it worked very well ------------------ -Knowledge is power, power leads to corruption, corruption is a crime, crime doesn't pay. So if you know to much you will go broke!!! http://members.xoom.com/Splynncryth
HMTD Factory Frequent Poster	posted February 18, 2000 06:06 PM Yeah...Egyptian chisel holes in the stone then hammer wooden rods into it, pour water, dry it, do it again few more times then the stone cracks. I am not fart, though. I doubt the product can destroy reinforced concrete, cuz the steel bar inside is far more elastic than concrete. [This message has been edited by HMTD Factory (edited February 18, 2000).]
AfterRain Frequent Poster	posted February 18, 2000 09:47 PM Nbk2000 Where would I go about gettin' that chem. , like home depot. ?
AfterRain Frequent Poster	posted February 18, 2000 09:54 PM Also, I forgot to ask , How many holes need to be drilled, how deep ? and if so whats the spacin' of the holes ?
nbk2000 Moderator	posted February 24, 2000 01:58 PM The betonamite can break reinforced concrete because the cracks just go around the rebar. It won't affect the rebar itself, but that's easily cut or bent. Go to http://www.rimrockexplosives.com/cracking.html . You can ask them to fax you a copy of the instruction manual. If you don't have a fax machine, there are free internet fax services. I use www.efax.com . The instructions say holes need to be about 1 foot apart. Just give them a call and ask for the instruction manual, it gives full explainations. And no licenses are needed to buy it. ------------------ "The knowledge that they fear is a weapon to be used against them."
Feticidal Fantasy Frequent Poster	posted February 28, 2000 04:38 PM This stuff does sound very useful. Espically useful in an urban jungle that is home to giant over passing freeways, 10 store cement parking gargages, cement bridge supports, the cement steps to city hall, etc. But $60 is a lot of money. Can you purchase this stuff at local hardware/building store such as home depot? Then you could buy a can, pour it into a different container, refil the old container(it looks brownish, Pepsi), and return it for a full refund. ------------------ Feticidal Fantasy- http://www.darksites.com/souls/vampires/feticidal/ "Keep your gun as your constant companion."
HMTD Factory Frequent Poster	posted February 29, 2000 02:02 AM FF. What you listed above all got steel reinforcement in them.
nbk2000 Moderator	posted February 29, 2000 08:15 PM This stuff isn't something you can pick up at home depot. You have to get it from explosives dealers. HMTD Factory, you don't have the benefit of the instructions. Rebar or other reinforcement has no effect on this stuff since the cracks go around the rebar. Even if the rebar keeps the pieces from seperating, the concrete will have lost all structural integrity and be useless for supporting a building. And rebar is soft and easily cut. The MSDS for this stuff lists it as having 75% calcium oxide (lime). That explains the heating when water is added. I would imagine the rest is some sort of absorbant material that expands when wet like starch or something. There's this polymer used as an absorbant in diapers that expands like 10 times its volume when it absorbs water. Maybe that is used. If you could figure out the composition then it would probably cost only a few dollars a poud to make it yourself. It's too expensive for most people to afford enough to destroy a building or something equally massive. But it would be useful for shattering the concrete base that the massive safes like grocery stores use are attached to. ------------------ "The knowledge that they fear is a weapon to be used against them."
Ho ju Moderator	posted March 01, 2000 04:27 PM i was bored in school today and was thinking about this stuff. when you drill the hole in the concrete would you have to cap it with anything so the stuff does not expand out of the holes? it seams to me that this stuff would just rise up instead of out cause that is the area of least resistance. NBK, you said it took an hour or to so it is not a violent reaction which makes me even more skepticle of how it works. ------------------ -Knowledge is power, power leads to corruption, corruption is a crime, crime doesn't pay. So if you know to much you will go broke!!! http://members.xoom.com/Splynncryth
nbk2000 Moderator	posted March 01, 2000 05:00 PM I don't know what keeps it from going out the hole. Maybe it solidifies on air contact or something. Since it contains lime, and lime weakens concrete, what may be happening is that the stuff creates small cracks which the stuff expands into, which in turn expands the cracks even more, and so on until it's fully expanded and the cracks meet. It does take several hours to work, but it can be a violent reaction. It's temperature sensitive and needs to mixed just right otherwise it will overheat and explode! The water you mix it with is turned into steam and it blows the stuff out the hole with great force according to the instructions. If your interested in it, I would suggest getting an e-fax number and having them fax you the instructions. ------------------ "The knowledge that they fear is a weapon to be used against them."
VeHeMT Frequent Poster	posted March 02, 2000 12:17 AM My guess is that the holes are so deep in relation to the diameter of the holes that the pressure expands into bursting the material. Must be fairly dense(the expanding compound). Chances are that the rebar wont even need to be cut, the weight of the building should be sufficient to fall to one side.
HMTD Factory Frequent Poster	posted March 02, 2000 05:06 AM I still doubt the stuff can destroy something stands vertical. Might work well on brick walls but a beam that supports public transit? I guess not. If the thing only works by lime, then test it on something that has no concrete in it, like a wood block or a brick. I assume it is using its own expansion. [This message has been edited by HMTD Factory (edited March 02, 2000).]
VeHeMT Frequent Poster	posted March 02, 2000 07:04 PM Even if you dont down the structure, the structure is still very unstable and unsafe, the thing would need to be repaired and thus unuseable. Why cant you believe it wont down structures? Its a matter of putting the "charges" in the right places, if you get a crack going the right way it will either severely weaken the structure or down it.
nbk2000 Moderator	posted March 02, 2000 07:24 PM If a building or bridge support was damaged so that only the rebar was intact, you can bet your ass that the police would evacuate/shut down the damaged structured until it could be repaired. And no one in their right mind would use it either. The lime idea was just a theory. Since the product is also used for cracking rocks like granite, it probably works by expansion alone. ------------------ "The knowledge that they fear is a weapon to be used against them."
Feticidal Fantasy Frequent Poster	posted March 02, 2000 07:43 PM I remember reading a murder case study in which someone made a cement coffin for the body, then packed it with lime(since lime aids in body decomposition) then they burried it along the shore of a lake. A week later some fishermen were walking along the shore, and fell through the cement. This is another example of lime's effect on cement. ------------------ Feticidal Fantasy- http://www.darksites.com/souls/vampires/feticidal/ "Keep your gun as your constant companion."
HMTD Factory Frequent Poster	posted March 03, 2000 05:16 AM Now I figured the reason why I feel something strange about the demolition, the picture from company site(above) has the expansion going sideways, the expansion force will need to exceed the binding force of concrete. But to destroy a (big)standing beam or support, the expansion force have to exceed the binding force plus the weight above. Normally, a bridge will have rubber filled between sections of bridge to prevent water getting in and icing, causing expansion at sideways, but on the beam support, nothing is done to prevent the likes. Everything is elastic, if the cracking agent didn't crack the structure, the force of expansion may be stored in a form of potential energy, meaning the cured cracking agent is squeezed flat by the weight. It is possible that pressure can somehow override the curing, take ice for example, it melts into water when pressure is applied on it, when pressure is gone, it goes back to ice(if temp. is maintained at 0*C) I am just a bit skeptical about the effectiveness of the cracking agent.
nbk2000 Moderator	posted March 03, 2000 07:04 PM I've posted the instruction booklet I was faxed on the forum archive site. It's called "crackingagent.txt". Rename it to "crackingagent.exe" because it's a self-viewing document. The instructions give full explainations of how to use it and why it does what it does. ------------------ "The knowledge that they fear is a weapon to be used against them."
Predator Frequent Poster	posted March 03, 2000 08:41 PM Concrete is good in compression, but very bad in tension. You could get the same results as above chemical with a piece of wood and some water. Shove the wood into a hole in the concrete as hard as you can and poor the water on top of the wood and let it soak in. The wood expands and the concrete gets broken... the chemical up above works on the same principle... just in a more convenient form.

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