SLIDE 1
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Minimum Density
Pluviate soil from height of 25 mm Vibrate for 8 minutes
Relative Density Chapters 3.5 Relative Density 1 2/5/2015 - - PDF document
Relative Density Chapters 3.5 Relative Density 1 2/5/2015 - - PDF document
2/5/2015 Relative Density Chapters 3.5 Relative Density 1 2/5/2015 Minimum Density Pluviate soil from height of 25 mm Maximum Density Vibrate for 8 minutes 2 2/5/2015 Relative Density Correlations Clean sand (0 F c 5%) Sand w/
SLIDE 2
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Clean sand (0 ≤ Fc ≤ 5%) Sand w/ fines (5 ≤ Fc ≤ 15%) Sand w/ fines and clay (15 ≤ Fc ≤ 30%)
Relative Density Correlations
0.072 1.53
Relative Density Correlations
SLIDE 4
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Soil Consistency
Chapter 3.6
BRICK MUD PLAYDOH (crumbly)
Atterberg Limits
SLIDE 5
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Liquid Limit Device Liquid Limit Determination
SLIDE 6
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Plastic Limit Determination
⅛" thread
Fall Cone
20 mm penetration in 5 seconds @ LL
SLIDE 7
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Fall Cone
= 38%
Fall Cone
~68% ~55% PI = 68% − 55% = 13%
SLIDE 8
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Shrinkage Limit
SLIDE 9
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Air Vv = e
Shrinkage Limit
1 w/ms
w i i s
SL w w w V 100% m
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Shrinkage Limit
Dish starts out full !
Note m2 = ms
Activity
activity
SLIDE 11
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Activity
(unhydrated) (hydrated)
Liquidity Index
BRICK MUD PLAYDOH (crumbly)
w
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Plasticity Chart
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Shrinkage Limit
Soil 1: SL = 20 – 6 = 14 Soil 2: SL = 20 + 9 = 29
+6
- 9
SLIDE 13
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(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Shrinkage Limit
Casagrande’s procedure for estimating the shrinkage limit.