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[SEAOC] Reactive aggregate[Subject Prev][Subject Next][Thread Prev][Thread Next]
- To: seaoc(--nospam--at)power.net
- Subject: [SEAOC] Reactive aggregate
- From: Lynn Howard <lhoward(--nospam--at)silcom.com>
- Date: Fri, 30 Aug 1996 12:28:34 -0700
I would like to know if anyone has some information on how we determine if coarse or fine aggregate for concrete is reactive or not. Here in S. Calif., I usually specify the coarse aggregate to be " San Gabriel" rock, heavy media processed or coarse aggregate of a equal or lower reactivity. And the sand or fine aggregate we specify to be moorpark sand or sand of a equal or lower reactivity. These are sources that we know produce aggregate of low potential for reactivity. What tests are there to determine the "equal" qualification, and what numbers do I look for in these test results? I know there is a test for Alkalinity Reduction that is usually given in millimoles/liter. Also a dissolved silica number also given in millimoles per liter. I believe these are tests per ASTM C289. What do these numbers mean and what should I be looking for to be certain that our aggregate will have a low potential for reactivity? Are there other tests or means to determine the reactive potential of aggregate? Thanks Lynn Howard ...
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