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AASHTO AASHTO
Low-plasticity SILTS High-plasticity SILTS Low-plasticity CLAYS High-plasticity SILTS High-plasticity CLAYS
Soil Classification Chapter 4 AASHTO 1 2/9/2015 AASHTO AASHTO - - PDF document
Soil Classification Chapter 4 AASHTO 1 2/9/2015 AASHTO AASHTO - - PDF document
2/9/2015 Soil Classification Chapter 4 AASHTO 1 2/9/2015 AASHTO AASHTO High-plasticity CLAYS Low-plasticity High-plasticity CLAYS SILTS Low-plasticity High-plasticity SILTS SILTS 2 2/9/2015 Group Index Partial Index for %
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Group Index
Partial Index for A-2-6 and A-2-7
% passing
- No. 200
Group index is always reported as a non-negative integer value Group index is always zero for groups A-1, A-3, A-2-4, A-2-5
AASHTO
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Example
- Classify the following soil using AASHTO:
– 98% passing the No. 10 sieve – 80% passing the No. 40 sieve – 50% passing the No. 200 sieve – LL = 38 – PL = 29 PI = 38 – 9 = 9
AASHTO
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Group Index
Partial Index for A-2-6 and A-2-7
% passing
- No. 200
Group index is always reported as a non-negative integer value Group index is always zero for groups A-1, A-3, A-2-4, A-2-5
USCS G = gravel S = sand M = silt C = clay O = organic Pt = peat W = well-graded P = poorly graded L = low plasticity H = high plasticity
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USCS
- Percent gravel (retained on No. 4 sieve)
- Percent sand
- Percent fines (passing No. 200 sieve)
- Cu and Cc
- LL and PI of portion passing No. 40 sieve
USCS
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USCS
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