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Which of these soils should, in principle, provide: a) a higher content of clay?

ID: 1827402 • Letter: W

Question

Which of these soils should, in principle, provide:

a) a higher content of clay?

b) a higher dry density?

c) a larger voids?

The following properties were determined for two index soils A and B:

Properties

SoilA

Soil B

Limit Liquidity

0,62

0,34

Limit Plasticity

0,26

0,19

Moisture Content

38%

25%

Hygroscopic moisture Density of Grains

1,5%

2,72

7,0%

2,67

Degree of Saturation

1,00

1,00

Properties

SoilA

Soil B

Limit Liquidity

0,62

0,34

Limit Plasticity

0,26

0,19

Moisture Content

38%

25%

Hygroscopic moisture Density of Grains

1,5%

2,72

7,0%

2,67

Degree of Saturation

1,00

1,00

Explanation / Answer

(A) For Clay LL<50, thus Soil B has higher content of clay.

(B) More is the plasticity, higher the toughness index = higher dry density. Thus soil A has higher dry density.

(C) eS = wG S,G are same for both. Therefore, e is proportional to moisture content. Soil A has larger void ratio.

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