Subject: RE: NDE Testing of grouted Multi-Strand PreStressing Tendons
From: "Sprague, Harold O." <SpragueHO(--nospam--at)bv.com>
Date: Wed, 29 Mar 2000 09:25:57 -0600
Contact the FHWA about Magnetic-Based System for NDE of Prestressing Steel
in Prestressed Concrete. Check it out at
http://www.tfhrc.gov/pubrds/july97/ndejuly.htm. It is supposed to be an
inspection tool for the detection and quantification of corrosion and strand
breakage in prestressed concrete. I believe that Wiss, Janney & Elstner is
working on this also.
> -----Original Message-----
> From: KRALIK Georg -NUCLEAR [SMTP:georg.kralik(--nospam--at)ontariopowergeneration.com]
> Sent: Wednesday, March 29, 2000 6:29 AM
> To: 'seaint(--nospam--at)seaint.org'
> Subject: NDE Testing of grouted Multi-Strand PreStressing Tendons
> Importance: High
> Can anyone in this group refer me to a web page or provide some
> on any available non-destructive methods of testing grouted pre-tensioned
> tendons in an in-service situation. In our facility we are using a
> combination of grouted and greased "sister" test beams, which are
> periodically tested - greased tendon test beams are tested for lift-off
> strands extracted to be visually checked for corrosion, and grouted tendon
> test beams are tested in bending and anchorages are visually inspected,
> finally one grouted tendon beam is periodically destructed and the tendon
> examined for corrosion. These test beams are kept on site in a storage
> at ambient temperatures.
> However these test beams do not provide us with any information on the
> possible early degradation of pre-stress losses due to higher temperature
> environments in our plant.
> We need to find some NDE method which lets us examine these grouted
> in place, while the plant is in operation.
> Please reply to my e-mail address or this news group. Thank you . . .
> GEORG A. M. KRALIK, P.Eng., M.Eng. - Structural, B.A.Sc. - Civil
> Senior Design Engineer - Civil/Structural
> Ontario Power Generation - Nuclear, Station Engineering Support Division
> Engineering Mechanics and Codes Department, Structural Analysis
> 700 University Avenue - H12 D08, Toronto, Ontario, Canada M5G 1X6
> Tel.: (416) 5924341, FAX: (416) 5928802,
> e-mail: georg.kralik(--nospam--at)ontariopowergeneration.com