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Re: z factor for crack control

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> Subject: z factor for crack control
> Author:  JENSEN@dmjm.com_at_-FDInternet at FDINET
> Date:    8/8/97 6:02 PM
> I have been facing a little dilemma lately regarding the crack control
> provisions in section 10.6 of the ACI code and would appreciate some
> advice...
> I am designing grade beams and mat slab for a large under/ above ground
> parking structure in Korea.  Local water table conditions are terrible,
> the structure must be designed assuming water to the ground surface or
> even a few meters above at flood stage.  To add to the problems, the
> structure is located in a highly marine environment.
> Looking at 10.6.5 in the code, I would venture a guess that a z value of
> 145 is not sufficient for this situation (Yes, i remembered to reduce the
> value for the slab, for all you nitpickers out there!).  What sort of
> number would be appropriate for this scenario and how can I justify using
> it?  I have also tossed around the idea of simply increasing the cover and
> leaving the z at 145.
> Any help you can give would be greatly appreciated.
> Thanks in advance.
> Wade Jensen

Is some type of foundation waterproofing system with drainage going to be used for the 
foundation?  If so, crack control concerns could be eliminated.

Mark Ahlskog