From: "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
Date: Wed, 9 Feb 2000 14:15:23 -0600
Are you sure that Intraplast has aluminum powder?
I presume that you are considering bonded PT. I would be concerned about
additional hydrogen in direct contact with high strength strand. The tendon
grouts that I am aware of contain corrosion inhibitors. That's why I like
to work with companies like VSL where it is one stop shopping for design,
materials, and systems. PT is a system which is difficult at best to
integrate. The systems should be tested for corrosion suseptability. When
you get your strand here, your grout their, your jacks from somewhere else;
the system is not well integrated, and when there is a problem, all you get
is finger pointing.
Hydrogen embrittlement shows little warning before it pops.
> -----Original Message-----
> From: Juan C. Gray [SMTP:juangray(--nospam--at)col2.telecom.com.co]
> Sent: Wednesday, February 09, 2000 9:53 AM
> To: seaint(--nospam--at)seaint.org
> Subject: Re: Expansive Grout
> Is anybody aware if there are any detrimental effects caused to
> post-tensioning tendons when you add aluminum powder (such as Sika's
> Intraplast) to the grout used to fill the tendon sheaths in
> post-tensioned beams? I am worried that the presence of hydrogen may
> increase corrosion susceptibility.
> Juan C. Gray