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RE: Slab on grade joint repair

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Just at a guess, I'd say impact is the problem.  Consider that pneumatic tires have a "shock absorber" effect when riding across a discontinuity, whereas hard tires have very little "rebound."  Thus, I'd guess that considerably higher impact factors are at work here.

-----Original Message-----
From:	Joseph Murar [SMTP:murarjm(--nospam--at)]
Sent:	Tuesday, September 15, 1998 2:07 PM
To:	seaint(--nospam--at)
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 ½"
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?

Joe Murar