Testing aggregates to avoid staining.(Problem Clinic)(Brief Article) From: The Concrete Producer | Date: January 1, 2004 | COPYRIGHT 2004 Hanley-Wood, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan.  All inquiries regarding rights should be directed to the Gale Group.Copyright information

Q. Is there a quick test to detect the presence of iron sulfide in aggregates? The aggregate I am considering will be used in an exposed decorative application, so repeated wetting and drying of the aggregate will occur at the surface. I also am concerned it may cause staining.

A. In most cases, sulfides can be easily and reliably detected visually with a binocular microscope, or a hand lens. A local geologist or mineralogist could show you what to look for.

Be careful to collect a representative sample of each batch of aggregate that you inspect. You'll have to examine ...

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