A de-bonded dowel
bar consists of a steel bar where one half is bonded to one panel and the other
is enclosed in a dowel sleeve which is bonded to the other panel.
bar is inside a sleeve it allows the two panels to move away from each other
with little restraint; reducing the risk of panel cracking from shrinkage.
Nowadays in new
slabs plate dowels are more common than bar dowels as they tend to be easier to
However they are
still commonly used when a new dowel needs to be installed into an existing
This is because it is much easier to drill a hole for a bar dowel than it
is to grind a slot for a plate dowel.
A common type of bar
dowel used today is the square dowel.
It is installed in a sleeve which has compressible
foam on both sides allowing some lateral movement parallel to the joint.