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Re: reinforcement in topping slabs

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Michael, Gary,
        You might want to think about using an admixture to reduce of eliminate shrinkage of the topping.  Such admixtures do exist; consult your ready mix supplier or a materials expert in your area.
H. Daryl Richardson
----- Original Message -----
Sent: Friday, January 12, 2007 3:04 PM
Subject: RE: reinforcement in topping slabs

Why are you bonding to the existing floor?  Any cracks in the existing floor will reflect in the new topping.  At the sump there will be some cracking unless reinforcing is used.  I would think about using steel fibers added to the mix and wet curing.  We have being using wet cure for 14 days minimum and that has reduced the amount of cracks.  You will never eliminate all of cracks.  Can you put in control joints?


Gary W. Loomis, P.E., Senior Structural Engineering

Master Engineers and Designers, Inc.

-----Original Message-----
From: Michael Laplante [mailto:michael.laplante(--nospam--at)]
: Friday, January 12, 2007 12:46 PM
To: seaint(--nospam--at)
Subject: reinforcement in topping slabs


I have a project that involves pouring a topping slab onto an existing structural slab.  The topping slab ranges from 3 inches thick near a sump pit to 6 inches at the wall of the room. The room/ slab size in approx 16' x 24'.  A bonding agent is currently specified.  I was wondering I should provide reinforcement in the topping slab to control cracking.?  Does the presence of reinforcement really help ?  Can the majority of the cracks be controlled by a well defined curing procedure.