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Re: Control Joints in a Mat Foundation

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Bill:
 
The requirement for joints that is more of a concern are construction joints..if required. If the slab is bigger that 60' or so in either direction then some thought should be given to the phasing of concrete placement. The mat reinforcement top and bottom should be designed for the applied loads in addition to controlling shrinkage cracking. No sawcut control joints should be made.
 
Regards
David Handy, P.Eng.
 
----- Original Message -----
From: Bill Allen
Sent: Thursday, October 27, 2005 3:28 PM
Subject: Control Joints in a Mat Foundation

I am working on a project which consists of a single story wood framed building sitting on a mat foundation. The mat is 16? thick.

 

A field question has come up regarding control joints. In a typical slab-on-grade, I specify cuts one third the slab thickness spaced no more that 3T feet where ?T? is the slab thickness in inches. These recommendations don?t make a lot of sense for a 16? ?slab?.

 

What would be a more appropriate guideline for this situation?

 

TIA,

 

T. William (Bill) Allen, S.E.

ALLEN DESIGNS

Consulting Structural Engineers