The purpose of this standard is to identify the presence of harmful clays of the smectite group(poor minus 75-µm material) and to provide an indication of the surface activity of the aggregate.
AASHTO T 330-07 (2019)
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Standard Method of Test for The Qualitative Detection of Harmful Clays of the Smectite Group in Aggregates Using Methylene Blue
American Association of State Highway and Transportation Officials , 2007