Chapter 6, Problem 6.6P

### 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

# Repeat Problem 6.4 with the following data (use Gs = 2.73):

(a)

To determine

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

Explanation

Given information:

The volume of 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 3.67 lb for W and 130ft3 for V.

γ=3.67130=110.1lb/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 110.1lb/ft3 for γ and 7.0 % for w.

γd=110.11+7.0100=102.9lb/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

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

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