AASHTO Soil Classification System - AASHTO Chart
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aboutcivil.org
AASHTO Soil Classification System - AASHTO Chart
The AASHTO Soil Classification System classifies soils into seven primary groups, named A-1 through A-7, based on their relative expected quality for road embankments, sub-grades, sub-bases, and bases. Some of the groups are in turn divided into subgroups, such as A-1-a and A-1-b. Furthermore, a Group Index may be calculated to quantify
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