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Engineering · Civil Engineering
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Table 3 and 4 present the particle size and index properties of soils. Use at least two methods to qualitatively identify the swell potential of the samples. Conclude on the effect of sand addition.

Table 4. Percentages of fines passing 75um size sieve.

Sample

Silt-size fraction (%)

Clay size fraction (%)

Colloidal particles

Natural Bentonite

22

78

57

33% Sand

15

56

48

50% Sand

16

34

28

75% Sand

7

18

16.5

Table 3. Atterberg limits of natural soil and mixtures with sand.

Sand

(%)

Bentonite

(%)

PL (%)

PI

(%)

LL

(%)

0

100

79

40

119

33

67

49

29

77

50

50

30

27

57

75

25

24

8

32

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