Relationship between EI and PI
Relationship between EI and PI
(OP)
Is there a way to relate or convert between expansion index and plastic index?
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Relationship between EI and PI
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RE: Relationship between EI and PI
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Plasticity Index % 0-10 10-15 15-25 25-35 35-100
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Expansion Potential Very Low Low Medium High VeryHigh
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From Robert W. Day - Geotechnical Engineer's Portable Handbook, 2000, McGraw-Hill Companies Inc. Table 12.2.
These values are a general guide. Individual sites may have varying clay minerals and silt contents that will vary from these values. These values assume typical distributions of kaolinite vs. montmorillonite in clay deposits.
Your best bet is to test for Expansion Index (ASTM), and recognize the limitations of laboratory results with respect to field behavior, like nearly all geotechnical testing.
RE: Relationship between EI and PI