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slab on grade joint repair

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From: Joseph Murar <murarjm(--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. =20
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 =BD"
deep and filled with an elastic joint filler.=20
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.=20
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?

Metzger/McGuire Co. makes a heavy duty joint filler for that type of
application. They are in Concord NH  (800) 223-6680

Roger Davis
SDS Architects, Inc.