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Plastic in Quarry stone

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Andy C

02-23-2008 06:06:39




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I have been placing stone on a job this last week and noticed in the 3 inch aggregate that there are pieces of PVC piping throughout the stone. I asked the truck driver if he knew where it came from and he said he thought they lined the blast holes with it. Does anyone know the reason they line the blast holes. I am sure there is a logical reason and very likely someone on this forum probably knows. Any knowledge of blasting practices here? Thanks,
Andy

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Andy C

02-24-2008 05:06:38




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 Re: Plastic in Quarry stone in reply to Andy C, 02-23-2008 06:06:39  
Thanks for the responses. For sure they are not trying to get rid of anything as the truck driver has seen it loaded on trucks (whole pieces)The reason it is not seen in the other sizes is probably the screens pick it up.It is a limestone quarry. Maybe it makes the blast pattern more consistent? Just thought it was interesting.
Andy



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JMS/.MN

02-23-2008 21:53:55




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 Re: Plastic in Quarry stone in reply to Andy C, 02-23-2008 06:06:39  
What is the source of the stone- a quarry or a gravel pit that accepts other products? I worked in a pit for two years that took old concrete, block, curb, demo, construction residue of various types...steel. plastic, wood, etc. Ran everything through the crusher, into various piles. Regarding blasting techniques- it"s usually to magnify the effect or control the result- per my military experience of 40 some years ago. Back then, it was get the most bang for the buck....scrounge, carry the least, work with whatever was available, to get the job done.

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1936

02-23-2008 15:36:18




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 Re: Plastic in Quarry stone in reply to Andy C, 02-23-2008 06:06:39  
Not so The holes are stone and blasted the day drilled under ground been their. Way to dispose of unwanted stuff.



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Billy NY

02-23-2008 10:59:59




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 Re: Plastic in Quarry stone in reply to Andy C, 02-23-2008 06:06:39  
That is a strange one, out of all the loads I've hauled from quarry's within a 100 mile radius of here, never saw the crushed stone aggregate contaminated with pvc like you describe. That is a new one for me.

I've been at some large face blasts before at a couple local quarries, and have also been on some sizeable rock excavation jobs where blasting was done as well, never noticed the holes being lined. when the driller was done. The only thing I've ever seen was the pieces of copper wire in the fractured rock and in the spoils excavated out. Always thought about undetonated caps or charges when in the hole excavating the material out. Can't claim to know a heck of a lot about blasting anyway, but I've been up close to a few, one had 300 lbs in the hole and over 12 blasting mats on it, was the first blast in a detention pond we were building, and boy the ground sure heaved up about 10 feet with the fractured spoil.

I know that pvc would be a problem if it was mixed in asphalt paving aggregate and concrete aggregate if there was a lot of it in the raw materials.

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msb

02-23-2008 09:37:32




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 Re: Plastic in Quarry stone in reply to Andy C, 02-23-2008 06:06:39  
Ammonium Nitrate is poured down the holes and diesel fuel is put in with the ammonium nitrate. I suspect the pipe is used to contain the diesel fuel. Probably porous stone. They don't use the PVC locally.



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MF294-4

02-23-2008 06:36:01




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 Re: Plastic in Quarry stone in reply to Andy C, 02-23-2008 06:06:39  
Back 35-40yrs ago I worked at a quarry for a year or so. Driller drilled vertical holes about 6ft apart. Poked a hole in a 3"x 18" stick of dynamite and inserted a electric cap of different delays depending on where the hole was in the shot. Let it down to the bottom of the hole and filled with diesel soaked ammouniam nitrate. If hole was full of water,used all dynamite. Don't know why. Boss would check wireing with a meter and take shelter under loader bucket and kkkaaaboom if everything went OK. I've got a hundred stories from there, It's a wonder no one got killed, and there were some close calls. Don't remember any PVC, just wires paper etc and I run the crusher.

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Marlowe

02-23-2008 06:18:01




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 Re: Plastic in Quarry stone in reply to Andy C, 02-23-2008 06:06:39  
keeps the blasting agent dry



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