Chapter 6, Problem 6.4P

Principles of Geotechnical Enginee...

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

Chapter
Section

Principles of Geotechnical Enginee...

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

The results of a standard Proctor test are given in the following table.a. Determine the maximum dry unit weight of compaction and the optimum moisture content. Given: Mold volume = 1/30 ft3.b. Determine the void ratio and the degree of saturation at the optimum moisture content. Given: Gs = 2.69.

(a)

To determine

Find the maximum dry unit weight of compaction and the optimum moisture content.

Explanation

Given information:

The volume of the mold (V) is 130ft3.

Calculation:

Calculate the unit weight of soil mass for trial 1 using the relation.

γ=WV

Here, W is the weight of moist soil in the mold for trial 1.

Substitute 3.7 lb for W and 130ft3 for V.

γ=3.7130=111lb/ft3

Similarly, calculate the unit weight of soil mass for remaining trials.

Calculate the dry unit weight of soil mass for trial 1 using the relation.

γd=γ1+w100

Here, w is the moisture content for trial 1.

Substitute 111lb/ft3 for γ and 8.6 % for w.

γd=1111+8.6100=102.2lb/ft3

Similarly, calculate the dry unit weight of soil mass for remaining trials.

Summarize the calculated values of unit weight and dry unit weights as in Table 1

(b)

To determine

Find the void ratio and degree saturation at the optimum moisture content.

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