>>>>>Why would you ever put 2 materials that even have the potential to corrode in contact?<<<,
Excellent point............. I did some reading on the subject.
When I think of FRP I think of a composite....matrix & fiber. It turns out that the epoxy matrix "insulates" the carbon from the steel, just like epoxy coated rebar resists corrosive environments.
The galvanic corrosion in the case of FRP is not FRPcontact to steel but BARE carbon fibers to steel.
The system, if applied properly, mitigates the corrosion potential....not unlike a diaelctric union for dissimailar metal in a plumbing sytem.
Just like R/C needing cover over the rebar......FRP needs cover (matirx) over the fiber otherwise you really don't have much of a "composite".
cheers
Bob
On 6/2/07, Will Haynes <gtg740p@gmail.com> wrote:
Try Google, there is a good bit of discussion about it. Why would you ever put 2 materials that even have the potential to corrode in contact?
"In the case of carbon FRP, the likelihood of galvanic corrosion due to steel-carbon fiber contact is also a concern."
http://campus.umr.edu/rb2c/publications/journal/1999/Anchorage.pdf
WillOn 6/2/07, Robert Kazanjy <rkazanjy@gmail.com> wrote:Additonally one needs an electrolyte for galvanic corrosion (one of the best is of course sea water but any water will do)
Except for plumbing systems or exterior applications, it seems ot me that the conditions for galvanic corrosion do not exist in a building system (like a floor joists)
cheers
BobOn 6/2/07, Robert Kazanjy < rkazanjy@gmail.com> wrote:Sorry to be so persistent but do you have soruce or reference for this concern?
cheers
BobOn 6/2/07, Will Haynes < gtg740p@gmail.com> wrote:Galvanic corrosion.
WillOn 6/2/07, Robert Kazanjy < rkazanjy@gmail.com> wrote:Will-
>>>>If you are using carbon FRP, I know it cannot be in contact with any of the steel.<<<<
Could you expalin further this prohibition?
cheers
BobOn 6/2/07, Will Haynes <gtg740p@gmail.com> wrote:What FRP are you using? If you are using carbon FRP, I know it cannot be in contact with any of the steel.
Will H.On 6/2/07, DOLLY TRIVIZ < dktriviz@msn.com> wrote:******* ****** ******* ******** ******* ******* ******* *** * Read list FAQ at: http://www.seaint.org/list_FAQ.asp * * This email was sent to you via Structural Engineers * Association of Southern California (SEAOSC) server. To * subscribe (no fee) or UnSubscribe, please go to: * * http://www.seaint.org/sealist1.asp * * Questions to seaint-ad@seaint.org. Remember, any email you * send to the list is public domain and may be re-posted * without your permission. Make sure you visit our web * site at: http://www.seaint.org ******* ****** ****** ****** ******* ****** ****** ********I have a project where we'd like to strengthen the existing open web floor joists (TJW) due to change of occupancy use. Loads have increased from 50 psf live +20 psf partition to 100 psf live with no partition loading.
Has anyone ever strengthened these types of joists using FRP's adhered to the bottom chord only?? Is this even a possiblity, considering the different materials (i.e. wood chords, steel web members, steel pins) used in the joists? Presence of piping/ducting running through the web spaces precludes the use of sheathing the sides of the joists with plywood, which was my first thought. Any other suggestions?? Thanks
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