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RE: Concrete Crack Control

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You should be okay for flexural crack control if you meet a z-value of 95.  ACI 350-01 still uses the z-formula and is the current standard for liquid-containing structures.  ACI 350-06 will be issued in a few months and has a new rebar spacing formula that is stricter than the ACI 318 spacing formula - but an appendix will still permit designs using the z-formula.  

William C. Sherman, PE
(Bill Sherman)
CDM, Denver, CO
Phone: 303-298-1311
Fax: 303-293-8236
email: shermanwc(--nospam--at)


From: Joe Grill [mailto:jgrill(--nospam--at)]
Sent: Wednesday, March 08, 2006 3:48 PM
To: seaint
Subject: Concrete Crack Control

ACI 318-02 has replaced the “z” factor for distribution of flexural reinforcing and crack control.  I have been asked to design a concrete septic tank.  In using the old method z=67 k/in which is less than the 95 k/in suggested in ACI 350 for severe environmental exposure, which in my opinion is overly suitable for this tank.  Anyway, I don’t have a copy of the new ACI documents.  Is anyone familiar with the newer requirements in a situation like this?  Are they similar to 10.6.4 in the new ACI 318-02, but more stringent?  Any help would be appreciated.


Joe Grill


Joseph R. Grill, P.E. (Structural)

Shephard - Wesnitzer, Inc.

Civil Engineering and Surveying

P.O. Box 3924

Sedona, AZ  86340

PHONE (928) 282-1061

FAX (928) 282-2058