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RE: corrosiveness of foundation soils

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Hadi,

 

I had thought that others with experience in the kind of conditions described in Section 1904.4.2 might have stepped in on this one.  Since not, I offer my thoughts.

 

Moisture is the key to the requirements of this Section.  Water that migrates into the concrete carries chloride ions in solution.  It is the chloride ions that attack the reinforcing steel causing corrosion.  Moisture penetrates less readily into dense concrete; thus the requirement for low water/cement ratio and high strength.  If the concrete is protected against moisture penetration so that it can be expected to be essentially dry permanently, the presence of chlorides should not pose a risk of causing corrosion in ordinary concrete.  I don’t know the limits that should raise concern for concrete that may be occasionally wet, such as a building’s perimeter foundation.  My impression is that this is generally not a concern in So. CA, except perhaps at coastal sites or industrial facilities that handle chlorides.

 

“Design and Control of Concrete Mixtures”, 14th edition, by PCA has guidance and references related to chloride content in concrete mixes, but, except for information like that in the Code Section you cited, I find nothing there regarding limits on chlorides in the environment.

 

Nels Roselund, SE

South San Gabriel, CA

njineer(--nospam--at)att.net


From: Hadi Tabatabaee [mailto:HadiT(--nospam--at)ci.fullerton.ca.us]
Sent: Friday, February 17, 2006 4:16 PM
To: seaint(--nospam--at)seaint.org
Subject: FW: corrosiveness of foundation soils

 

 

 

 

 

 

  

 

 
Subject: FW: corrosiveness of foundation soils

 

 

 

 Subject: corrosiveness of foundation soils

 

 What is the limitation of Chloride content (ppm), where section 1904.4.2 and Table 19-A-2 need to be enforced?  Is there any ASTM standard?     

 

Thank You

 

Hadi Tabatabaee, P.E., C.B.O.

Building official

City Of Fullerton

hadit(--nospam--at)ci.fullerton.ca.us

(714) 738-6558