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Old 02-02-2013, 12:38 AM   #16
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Removing dust from holes drilled in concrete


Thanks for all of the suggestions. I finally decided to bite the bullet and get a cheapo air compressor from Harbor Freight. I'm glad I did. Even the holes that I thought were thoroughly cleaned out puffed a significant amount of dust when hit with 80 psi air. The down side was that I could only do a couple of holes, then I had to wait two minutes or so for the air tank to recharge. Since I was scrunched up in a narrow crawl space, I'm sure it seemed a lot longer than it really was.

Anyways, I'll try to remember to post some pictures once the epoxy dries and I get everything bolted together.

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Old 02-02-2013, 03:40 PM   #17
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Removing dust from holes drilled in concrete


You really should be using a wire "pipe cleaner" brush in the holes as well, as it's less important to get the bottom of the hole clean as it is the sides. Typically, the process is drill, blow out, brush, blow, brush, blow, and the quickest way is to get the brushes that accept 1/8" pipe thread, and run them in your drill.............
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Old 02-04-2013, 12:19 AM   #18
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Removing dust from holes drilled in concrete


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You really should be using a wire "pipe cleaner" brush in the holes as well, as it's less important to get the bottom of the hole clean as it is the sides. Typically, the process is drill, blow out, brush, blow, brush, blow, and the quickest way is to get the brushes that accept 1/8" pipe thread, and run them in your drill.............
Thanks for the comment. And, yes, that's basically the process that Simpson recommends:

1) Compressed air, at least 80 psi for at least 4 seconds
2) Nylon "bottle" brush, in and out at least 4 times
3) Compressed air again, 80 psi minimum, 4 seconds minimum

So, that's the essentially what I did. The brush I used was a tight-fitting nylon bottle-type brush designed for the purpose, and I used it more than 4 times per hole, twisting as I inserted it and pulled it out.

Because of the temperature, I've had to wait 72 hours for the epoxy to set. That time is up tomorrow afternoon, so probably by the day after I'll be able to finish off this first phase of the project. I'll post some pictures when it's done.
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Old 02-04-2013, 10:13 AM   #19
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Removing dust from holes drilled in concrete


Did you buy the double barrel epoxy gun or just rent it?

And....Isn't that epoxy expensive? And careful what you get it on....it WON'T come off....
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Old 02-04-2013, 10:55 AM   #20
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Removing dust from holes drilled in concrete


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Could go bigger and rent an oxy bottle from a welding supply shop
Oxygen should never be used for anything it was not designed for. The use of highly compressed air gas, especially oxygen, as a substitute for lower pressure compressed air is potentially very dangerous.

There are several substances that can spontaneously explode or ignite with pure high pressure oxygen.

Last edited by Anti-wingnut; 02-04-2013 at 11:35 AM.
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Old 02-04-2013, 09:03 PM   #21
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Removing dust from holes drilled in concrete


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Did you buy the double barrel epoxy gun or just rent it?

And....Isn't that epoxy expensive? And careful what you get it on....it WON'T come off....
Good questions. Yes, I bought the double barrel epoxy gun (the smaller one, for 22 oz tubes). It's outrageously expensive, but on the upside, it works pretty well, given that the epoxy is extremely stiff stuff. Of course, the epoxy itself is expensive too. Now I figure that I have to epoxy a lot of bolts into place to make it all worthwhile...

Actually, I allocated $1K for this entire job, and even after buying a good rotary hammer ($200), a cheap air compressor ($75), a fancy epoxy gun (about $65), and almost all metal parts being zmax/galvanized, I'm sure I'll still come in well under budget. It would of cost several times as much to get somebody to do it, and even more to get it done by somebody I really trust to do it right.

Btw, I've previously done quite a bit of work with epoxy (boat builder kinds of stuff mostly, but also epoxy grout---not epoxy-related concrete work). If you're interested, here are some photos where I put epoxy over a madrone slab
http://www.woodworkingtalk.com/f8/ep...ne-slab-17529/
and here's some pictures of some of my epoxy grout work
http://www.johnbridge.com/vbulletin/...t=79843&page=4

Anyways, you definitely don't want to get epoxy on your bare skin. It's a "sensitizing" agent (like poison oak, for example). You might have no problem the first time (or 2 ,or 3, or...) that uncured epoxy gets on your skin, but at some point, you're likely to be sensitized. After that happens, you'll have a nasty reaction whenever you touch it, and maybe even when you're just in the same room with uncured epoxy. So, it's best not to let things get to that point.
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Old 02-06-2013, 07:03 PM   #22
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Removing dust from holes drilled in concrete


Thanks to all of the helpful responses here, I've finally made some progress on my seismic retrofit. I've started a different thread for that info---if you're interested, point your browser here:
Seismic retrofit

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