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Re: Permissible Sulfate Content in Concrete

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Take a look at UBC table 19-A-4 in page 2-179 of the 97 UBC volune II.
Samir Ghosn, P.E.
Harris & Associates
(800) 827-4901
At 09:34 AM 1/9/2002 -0800, you wrote:
>Here is a question for all you concrete experts out
>there.  I have received some preliminary test results
>from concrete specimens taken from the piles of an
>existing building.  Results indicate that sulfate
>contents range from 0.5% up to 2.5%.  (Not sure if
>this is by total weight of specimen or by total weight
>of cement).  It was also reported that chunks of
>concrete could also be removed by hand at some
>locations.
>
>I understand that sulfates reacts with the calcium in
>the concrete to slowly degrade the cement matrix.   My
>question is, what percentages constitutes a  mild,
>moderate, and severe exposure?  Chapter 4 of ACI does
>provide maximum permissible chloride contents in
>concrete, is there a similar table for sulfates?  Is
>there any correlation between sulfate content and
>reduced concrete strength (i.e. 5% sulfates equals a
>loss of 10% in concrete compressive strength).
>
>If anyone can provide some useful references or
>insight into this matter, it would greatly be
>appreaciated.
>
>Thanks.
>
>John
>
>
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