Traffic and Highway Engineering
Traffic and Highway Engineering
5th Edition
ISBN: 9781305156241
Author: Garber, Nicholas J.
Publisher: Cengage Learning
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Chapter 17, Problem 1P
To determine

Void ratio, dry density and degree of saturation of the soil.

Expert Solution & Answer
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Answer to Problem 1P

  e=0.70

  γd=100.81lbft3

  S=0.94

Explanation of Solution

Given information:

  Bulk density=125lb/ft3

  Moisture content=24%

  Specific gravity=2.75

Concept used:

  γd=γ1+w

  γd=Gsγw1+ee=Gsγwγd1

  S=wGse

  γdDry densityγBulk densitywMoisture contentGsSpecific gravityγwDensity of watereVoid ratioSDegree of saturation

Calculation:

The dry density is determined using the formula

  γd=γ1+w=1251+0.24=100.81lb ft3

The void ratio is determined using the relation

Take, density of water as 62.4lbft3.

  e=Gsγwγd1=( 2.75×62.4 100.81)1=0.70

The degree of saturation is determined using the relation

  S=wGse=0.24×2.750.70=0.94

Conclusion:

The void ratio, dry density and degree of saturation of the soil is 0.70, 100.81lbft3 and 0.94.

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