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Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939

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BuyFindarrow_forward

Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939
Textbook Problem

Results of a standard Proctor compaction test on a silty sand are shown in Figure 6.40.

images

Figure 6.40

a. Find the maximum dry unit weight and optimum moisture content.

b. What is the moist unit weight at optimum moisture content?

c. What is the degree of saturation at optimum moisture content? Given: Gs = 2.69.

d. If the required field dry unit weight is 18.5 kN/m3, what is the relative compaction?

e. What should be the range of compaction moisture contents in the field to achieve the above relative compaction?

f. If the minimum and maximum void ratios are 0.31 and 0.82, respectively, what is the relative density of compaction in the field?

(a)

To determine

The maximum dry unit weight and the optimum moisture content.

Explanation

Calculation:

Plot the graph for moisture content versus dry unit weight as in Figure (1).

Refer Figure (1).

The maximum dry unit weight is 19kN/m3 and the optimum moisture content is 10.8 %

(b)

To determine

The moist unit weight at the optimum moisture content.

(c)

To determine

The degree of saturation (S) at the optimum moisture content.

(d)

To determine

The relative compaction for the required field dry unit weight of 18.5kN/m3.

(e)

To determine

The range of compaction moisture contents in the field to achieve the relative compaction.

(f)

To determine

The relative density of compaction in the field.

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