CENG 3232

Soil Mechanics

Assignment # 3

Show all your calculations to receive the full credit.

1. (5 pts) Classify the following soils by the AASHTO classification system. No need to calculate the

group index. Pick one of the soils and briefly explain how you arrive at your final answer.

Soil

A

B

с

D

E

Inorganic

Soil

A

B

с

D

Sieve Analysis (% Passing)

No. 40

80

92

88

55

75

E

No. 10

98

100

100

85

92

No. 200

50

80

25

34

62

Liquid

Limit

Sieve Analysis (% Passing)

No. 4

No. 200

92

48

60

40

99

76

90

60

80

35

38

56

37

28

43

2. (5 pts) Classify the following soils by the USCS. Pick one of the soils and briefly explain how you

arrive at your final answer.

Liquid

Limit

Plasticity

Index

30

26

60

41

24

29

23

22

20

28

Plasticity

Index

Soil Type

Designation

8

4

32

12

2

Group

Symbol