Need a book? Engineering books recommendations...

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

Re: Repairing Cracked Masonry

[Subject Prev][Subject Next][Thread Prev][Thread Next]
Stan,

It looks like that's what they've used previously. These are large cracks say 1" wide. The rebar will not fully restrain movement, it is after all just a 1/4" rod but hopefully would add ductility to the joint and hopefully restrian the movent that disloges the caulk. Yes there is a lot of hope in that sentence. Point well taken though.

Harold,

I have my doubts too, that's why I posted... what do you mean develop a mortar doesn't an epoxy mortar already exist?

David,

The Engineer who evaluated the problem 15 yrs ago had the same conclusion as you did. But he neglected to notice the 4 to 5" of differential movement in the foundation and that there is no discrete lateral force resisting system. Differential foundation movement alone can cause a variety of crack shapes vert, horiz, stairstep then add the displacement from wind loading.

Now set me straight on the expanding brick...As the brick expands it creates a 1" gap??? I thought you leave a 1" gap so the material can expand into that gap without causing distress....(I'm with you that clay expands and concrete shrinks over time but...)


Keep it coming this is productive, Thanks guys :>

Rand



----- Original Message ----- From: "David Fisher" <dfisher(--nospam--at)fpse.com>
To: <seaint(--nospam--at)seaint.org>
Sent: Tuesday, November 09, 2004 12:15 PM
Subject: RE: Repairing Cracked Masonry


Sounds like "Mother Nature" has created a control joint where none
previously existed...

Is that true?

What, if anything, did the architect specify?



Since it's vertical and not stepped, it would appear to be the result of
thermal/moisture stresses and not structural issues...


As we know, clay expands when wet while Portland cement products (CMU)
Shrink over time.


If it's a naturally occurring control joint, its probably needed in exactly
or
Nearly that spot.


Treat it as such: fill the gap with a compressible filler and backer
rod/seal the
Exterior side of the joint.



David L. Fisher SE PE
Fisher + partners
372 West Ontario
Chicago 60610

312.573.1701
312.573.1726 fax

312.622.0409 mobile

www.fpse.com

-----Original Message-----
From: Rand Holtham, P.E. [mailto:rand(--nospam--at)sigmaengineers.com]
Sent: Tuesday, November 09, 2004 11:49 AM
To: seaint(--nospam--at)seaint.org
Subject: Repairing Cracked Masonry

Lister,

For the sake of brevity I will condense a very complex problem into a simple

question that I have no answer for:
I have a large crack (actually many large cracks) in the brick veneer on an eight story building. This crack allows water to penetrate the building and
attempts to caulk have been unsuccessful as the crack moves thereby
dislodging the caulk. I am contemplating the addition of a small  (say #2)
rebar in the grout joint  (grind out joint repoint with epoxy mortar or
other?) so that the reinforcing crosses the crack in essence stitching the
crack together. Then applying the caulk with the idea that the added
reinforcing will control the crack from movement beyond that which the caulk

can tolerate. I can see extending the reinforcing 24" or 36" on each side of

the crack This is not to stop the building movement but to facilitate
waterproofing the brick facing.

My simple question is--- will the rebar bond well enough to the brick and
mortar for this to be effective? Any thoughts will be greatly appreciated
~:-).


Rand



******* ****** ******* ******** ******* ******* ******* ***
*   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
******* ****** ****** ****** ******* ****** ****** ********


******* ****** ******* ******** ******* ******* ******* ***
*   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
******* ****** ****** ****** ******* ****** ****** ********




******* ****** ******* ******** ******* ******* ******* ***
*   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 ******* ****** ****** ****** ******* ****** ****** ********