Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

Rust never sleeps

[Subject Prev][Subject Next][Thread Prev][Thread Next]
Integrated Design Services, Inc.
250 N. Golden Circle Dr., Suite 105
Santa Ana, CA 92705
(714) 541-5440 x15
FAX (714) 541-5330
E-mail:  bob_freeman(--nospam--at)idsids.com

October 1, 2001

Jeff

Very interesting question.

Questions:  1.  How much corrosion is there on the reinforcement in the
concrete fill? Any cracking/ spalling in the concrete fill?
                   2.  How much excessive moisture is still in the concrete
fill above the steel deck after the 10                         year leak has
been repaired?
                   3.  Since rust is the result of the wet-dry process,  how
will moisture from the normal hot/cold                         and humidity
cycle be prevented from accumulating on the bottom of the rusty steel deck,
and in the concrete fill?
                   4.  Have possible contributors to the roof leak
(inadequate roof slope, or ponding, or
excessive roof member deflection) been addressed?
                   5.  You mentioned that the steel deck is 'composite.'
Are welded steel studs on top of steel                              beams a
part of the existing condition?  If so, have they been checked for possible
corrosion?
                   6.  Is there rigid insulation above the concrete deck?
If so, is it saturated?  If it is, it is also
useless as an insulating material.  Will it also be replaced?

These questions should be addressed in your investigation.

To respond to your question, it appears that it would be nearly impossible
to expect the rusting to stop by repairing the water leak.

Respectfully,
Integrated Design Services, Inc.


Bob Freeman, AIA
Senior Structural Designer





******* ****** ******* ******** ******* ******* ******* ***
*   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(--nospam--at)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 
******* ****** ****** ****** ******* ****** ****** ********