Chapter 3, Problem 3.4P

### 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

# During a compaction test in the geotechnical laboratory, the students compacted a clayey soil into a cylindrical mold 4 in. in diameter and 4.58 in. in height. The compacted soil in the mold weighed 4 lb, and it had a moisture content of 12%. If Gs = 2.72, determine the following:a. Dry unit weightb. Void ratioc. Degree of saturationd. Additional water (in lb) needed to achieve 100% saturation in the soil sample

(a)

To determine

Calculate the dry unit weight of the soil.

Explanation

Given information:

The diameter of the cylindrical mold (d) is 4in..

The height of the cylindrical mold (h) is 4.58in..

The weight of the compacted soil (W) is 4lb.

The moisture content (w) is 12%.

The specific gravity of the soil solids (Gs) is 2.72.

Calculation:

Calculate the volume of the mold (V) using the relation.

V=14πd2h

Substitute 4in. for d and 4.58in. for h.

V=14π×42×4.58=57.554in.3×(1ft12in

(b)

To determine

Calculate the void ratio of the soil.

(c)

To determine

Calculate the degree of saturation of the soil.

(d)

To determine

Calculate the additional water needed to achieve 100% saturation in the soil sample.

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