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RE: Methods of Injection of Cracks in Concrete: Which Is Preferre d?

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Scott Maxwell described my intent well, regarding moving vs non-moving (or
active vs inactive). The trick is to determine which applies in your case.

> -----Original Message-----
> From: Bill Polhemus [mailto:bill(--nospam--at)polhemus.cc]
> Sent: Saturday, February 09, 2002 7:03 PM
> To: seaint(--nospam--at)seaint.org
> Subject: RE: Methods of Injection of Cracks in Concrete: Which Is
> Preferred?
>
>
> By "moving" vs. "non-moving" cracks I assume you mean cracks
> that are caused
> by movement of the structure as opposed to cracks caused by
> overloading of
> the structure or elements thereof. Am I reading you correctly?
>
> The structure I'm dealing with is not a water containment
> structure. The
> cracks I'm dealing with are almost certainly from environmental
> deterioration of the concrete over time (the structure in
> question was built
> in the mid-1960s).
>
>
>
> William L. Polhemus, Jr. P.E.
> Polhemus Engineering Company
> Katy, TX, USA
> Phone (281) 492-2251
> FAX (281) 492-8203
> email bill(--nospam--at)polhemus.cc
>
> -----Original Message-----
> From: Sherman, William [mailto:ShermanWC(--nospam--at)cdm.com]
> Sent: Saturday, February 09, 2002 5:49 PM
> To: 'seaint(--nospam--at)seaint.org'
> Subject: RE: Methods of Injection of Cracks in Concrete:
> Which Is Preferred?
>
> Are you talking about a liquid containing structure or just
> general weather
> exposure?
>
> For a liquid containing structure, I would not allow a
> surface sealant in
> lieu of crack injection. I use polyurethane injection for
> shrinkage/ moving
> cracks and epoxy injection for structural/ non-moving cracks.
>
> > -----Original Message-----
> > From: Bill Polhemus [mailto:bill(--nospam--at)polhemus.cc]
> > Sent: Saturday, February 09, 2002 1:50 PM
> > To: seaint(--nospam--at)seaint.org
> > Subject: Q: Methods of Injection of Cracks in Concrete: Which Is
> > Preferred?
> >
> >
> > As I believe I've mentioned before, I find myself more and
> more doing
> > consulting for concrete structure renovations. I have some
> > questions for
> > those who might have some experience with this (especially the plant
> > engineering people, where you're having to use innovative
> > methods using
> > technology beyond "spit and bailing wire" to maintain tank
> > foundations,
> > etc.)
> >
> > My client sent out an Invitation to Bid based on some
> > specifications I had
> > written. Since I'm more comfortable in the world of crack
> > injection using
> > epoxy or urethane, that's the way I went with my spec.
> > However, one bidder
> > replied with an alternate system including "chasing" or
> > "routing out" the
> > cracks, applying a Sonneborn 733 Primer in the routed
> crack, and then
> > Sonneborn NP2 Sealant. Now, I have used NP2 before, but only
> > as the final
> > component of a joint seal. It has essentially no structural
> properties
> > (though to be sure the urethane isn't exactly holding up the
> > world). My
> > feeling is that the crack injection is more sure, but the
> > bidder disagrees,
> > saying it is too expensive for the results you get
> > (unbeknownst to him,
> > though, his argument is somewhat overshadowed by the fact that the
> > next-lowest bidder, only 8% higher than the lowest bid, DID
> submit my
> > procedure to the letter).
> >
> > I'd love to hear input from those who have an opinion and any
> > other wisdom
> > you'd care to share on this topic.
> >
> >
> >
> > William L. Polhemus, Jr. P.E.
> > Polhemus Engineering Company
> > Katy, TX, USA
> > Phone (281) 492-2251
> > FAX (281) 492-8203
> > email bill(--nospam--at)polhemus.cc
> >
> >
> >
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