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RE: Slab dowels - plate v. square v. round

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This thread peaked my curiosity enough to follow it to the PCA website where I am $100 lighter but can claim proud possession, (soon) of the apparently venerable ACI 302.1 R-04 which I heretofore have only seen excerpted here and there.


I’m not sure if I should thank you all or swear at you….




From: Michelle Motchos [mailto:mmotchos(--nospam--at)]
Sent: Wednesday, April 30, 2008 1:32 PM
To: seaint(--nospam--at)
Subject: RE: Slab dowels - plate v. square v. round


I also like the plate dowels and normally specify the PNA’a. I think there is a higher likelihood of accurate/non-skewed placement than with the longer round dowels.  I have not experienced any particular resistance from contractors when specifying them. 

A flatwork sub recently brought me a sample of EZdowel which I thought was pretty interesting since it can include a full prepared edge form as part of the package.  He found it to be easier/faster to work with then attaching the PNA sleeves to standard forms.  



Michelle Motchos, PE
Stevens & Wilkinson of South Carolina, Inc.

Columbia, SC

From: Harold Sprague [mailto:spraguehope(--nospam--at)]
Sent: Wednesday, April 30, 2008 2:11 PM
To: seaint(--nospam--at)
Subject: RE: Slab dowels - plate v. square v. round


I prefer the square dowels.  PNA ( sells alignment devices.  They also sell a device that allows one slab to shrink differentially to an adjacent slab placed at a later time (square dowel clip). 
I also like the idea that the flat surface of a square dowel can resist higher loads to avoid differntial movement and degradation of the joint.  And they sell a very effective armored slab edge. 

Harold Sprague

Date: Tue, 29 Apr 2008 08:18:40 -0700
From: wilsonengineers(--nospam--at)
Subject: Slab dowels - plate v. square v. round
To: seaint(--nospam--at)

Is there a big trend towards using plate and/or square dowels in industrial slabs instead of round dowels?


The manufacturer's web sites for plate dowels present good arguments, but do the benefits outway the costs and contractor complaints from the perspective of the specifying engineer?


Jim Wilson


Spell a grand slam in this game where word skill meets World Series. Get in the game.