Chapter 6, Problem 6.4P

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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 ft^{3}.

**b.** Determine the void ratio and the degree of saturation at the optimum moisture content. Given: *G _{s}* = 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

Calculation:

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

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

Substitute 3.7 lb for *W* and *V*.

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.

Here, *w* is the moisture content for trial 1.

Substitute *w*.

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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