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Re: Aggregate Spec (Re-post)

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If you have access to PCA, "Design and Control of Concrete Mixtures", look at Chapter 5 under "Fire Resistance and Thermal Properties".  The fire resistance and thermal properties of concrete depend to some extent on the mineral constituents of the aggregates used.  Concrete containing a calcareous coarse aggregate performs better under fire exposure than a concrete containing quartz or siliceous aggregate such as granite or quartzite (see ACI 216 and ACI 221).  You might be able to find an ASTM that regulates or defines the thermal expansion rate of aggregates.  Hope this gets you in the right direction.

Thomas Hunt, S.E.

"Paul Feather" <pfeather(--nospam--at)>
12/28/2005 03:45 PM
Please respond to seaint
        To:        "SEAOC List" <seaint(--nospam--at)>


        Subject:        Aggregate Spec (Re-post)


This is a re-post
Concrete cover for fire protection is based on aggregate type, carbonate or siliceous.  What would be the appropriate ASTM reference to ensure carbonate aggregate?  In other words, "All concrete aggregate shall be carbonate in conformance with ASTM (Fill in the blank)".
I do not see where there is a distinction in C-33.
Paul Feather PE, SE

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