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RE: corrosiveness of foundation soils

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Hadi,

 

Chloride ions in the concrete destroys the passive layer on the embedded steel and allows corrosion to occur.  Based upon field testing of existing foundations in petrochemical plants, the normally accepted threshold for

depassivation is 0.2 % chloride by weight of cement or about 0.02% by weight of concrete (approximately 1.3 lbs. of chloride ions to 1 cy of concrete). This doesn’t directly address Section 1904.4.2, but I thought it might

be of general use to you.

 

Regards,

 

Randall H. Collier, P.E.

Baton Rouge, LA

 


From: Hadi Tabatabaee [mailto:HadiT(--nospam--at)ci.fullerton.ca.us]
Sent: Friday, February 17, 2006 6:16 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