06 - Soil Classification for Students/06 - Soil Classification (2-Up).pdf · 2/9/2015 4 Example •...
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2/9/2015 1 Soil Classification Chapter 4 AASHTO
Transcript of 06 - Soil Classification for Students/06 - Soil Classification (2-Up).pdf · 2/9/2015 4 Example •...
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Soil Classification
Chapter 4
AASHTO
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AASHTO
AASHTO
Low-plasticitySILTS
High-plasticitySILTS
Low-plasticityCLAYS
High-plasticitySILTS
High-plasticityCLAYS
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Group Index
Partial Index forA-2-6 and A-2-7
% passingNo. 200
Group index is always reported as a non-negative integer valueGroup 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 = 29PI = 38 – 9 = 9
AASHTO
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Group Index
Partial Index forA-2-6 and A-2-7
% passingNo. 200
Group index is always reported as a non-negative integer valueGroup index is always zero for groups A-1, A-3, A-2-4, A-2-5
USCS
G = gravelS = sand
M = siltC = clay
O = organicPt = peat
W = well-gradedP = poorly graded
L = low plasticityH = 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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![[PPT]Slide 1 - Indiana · Web viewWet Soil/Tare Dry Soil/Tare Plasticity Index Moisture Loss 21.0 Tare Tested By: Dry Soil xx % Moisture Sieve Analysis Data with LL & PL SIEVE ANALYSIS](https://static.fdocuments.in/doc/165x107/5b2d8f337f8b9adc6e8bd656/pptslide-1-web-viewwet-soiltare-dry-soiltare-plasticity-index-moisture.jpg)
