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RE: Slab on grade joint repair

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ACI 360 covers this a little.  the Industrial Truck Assn. "Recommended 
Practices Manual" (Pittsburgh, PA 1985) I believe covers the wheel loadings 
, too.  Whenever you have hard tire lifts, you will have cracking at 
control joints, and the deeper the joint, the worse the cracking to some 
extent.  Harder wheels mean smaller bearing areas.   It's not a serious 
structural issue, but is unsightly.  One of the easier ways to fix it is to 
router out the joint with a rounded or 1:1 slope to a depth equal to the 
width of the cracking/spalling, then fill the joint with a good rigid 
filler.
JDC

-----Original Message-----
From:	Joseph Murar [SMTP:murarjm(--nospam--at)wwics.com]
Sent:	Tuesday, September 15, 1998 1:07 PM
To:	seaint(--nospam--at)seaint.org
Subject:	Slab on grade joint repair

I need some information and ideas on repairing spalling at the construction
and control joints in an existing concrete slab on grade.
The slab is about 7 years old and 6" thick 4000psi concrete with #4s @ 24"
o/c E/W.  The control joints are cut in 15 feet square to a depth of 1 1/2"
deep and filled with an elastic joint filler.
Ever since the client switched from pneumatic tire to hard tire forklifts
there has been noticeably cracking at the joints. The capacity of the old &
new lifts and the loads they carry are identical.
Has anyone had this experience and what was the method of repair, did it
hold after some months of being exposed to traffic?
Also is there a reference were one can compare impact loading between
pneumatic and solid tire lifts?

Thanks
Joe Murar