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Posted by Wayne Whitney on October 21, 2007, 6:01 pm
> the correct sequence is: blow brush blow brush
> the last thing to go in the hole (before the epoxy) must be the brush.
> if you blow last, it coats the hole with dust & weakens the epoxy bond
Interesting, Bob. Simpson's instructions for their SET epoxy say to
"blow brush blow". Do you think that they have it wrong?
<http://www.simpsonanchors.com/catalog/adhesives/adhesive_anchoring_install.html>
Cheers, Wayne
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Posted by Bobk207 on October 21, 2007, 8:08 pm
>
> > the correct sequence is: blow brush blow brush
> > the last thing to go in the hole (before the epoxy) must be the brush.
> > if you blow last, it coats the hole with dust & weakens the epoxy bond
>
> Interesting, Bob. Simpson's instructions for their SET epoxy say to
> "blow brush blow". Do you think that they have it wrong?
>
> <http://www.simpsonanchors.com/catalog/adhesives/adhesive_anchoring_in...>
>
> Cheers, Wayne
My experience plus my interaction with home office Hilti
engineers ....they said brush, blow, brush
They explained that the "final brush" drops the drops the dust off
the hole wall.
I added the extra blow / vacuum on the front end but kept the Hilti
"finish with brush"
Again my experience based on drilling, cleaning, bonding & testing
anchors in concrete in the lab.
flour (dust) is used as a release agent when working with dough
paint doesn't stick to dust; I use a brush & a tack cloth when
prepping for paint
YMMV.....draw your own conclusions
counter argument / theory? :)
cheers
Bob
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Posted by Wayne Whitney on October 21, 2007, 8:56 pm
> counter argument / theory? :)
Oh, I don't really have one, although one can imagine a counter
argument. Mostly I was surprised that Hilti and Simpson give opposite
instructions in this regard. I guess the obvious question is what is
the bonding mechanism of the epoxy to the concrete? But this is
academic.
Cheers, Wayne
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Posted by Bobk207 on October 21, 2007, 9:40 pm
>
> > counter argument / theory? :)
>
> Oh, I don't really have one, although one can imagine a counter
> argument. Mostly I was surprised that Hilti and Simpson give opposite
> instructions in this regard. I guess the obvious question is what is
> the bonding mechanism of the epoxy to the concrete? But this is
> academic.
>
> Cheers, Wayne
Wayne-
>>>Oh, I don't really have one, although one can imagine a counter argument. <<<<
If you can imagine one....let's have it.
Dust inhibits adhesion.
cheers
Bob
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Posted by Wayne Whitney on October 22, 2007, 12:24 pm
>
> >Oh, I don't really have one, although one can imagine a counter argument.
>
> If you can imagine one....let's have it. Dust inhibits adhesion.
Absolutely, dust inhibits adhesion. But then the question is which
procedure, brushing or blowing, yields a dust pattern that has the
lower impact on adhesion. You mentioned brushing last to dislodge any
loose dust on the sides, where it will fall to the bottom.
Arguments in favor of blowing last could be (1) blowing will remove
any loose dust at the bottom and won't significantly redeposit it on
the sides or (2) brushing may yield fine dust that is suspended in the
air, and blowing is the only way to remove this fine dust.
Anyway, I don't really know anything about this. But Simpson
recommends blowing last, and I see someone else said that Hilti's
written instructions say the same thing. I assume the only way to
resolve the question would be to do tests. Or perhaps it is most
important to just use whatever procedure was used when the published
strength data was developed.
Cheers, Wayne
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