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Three groups of students from the Geotechnical Engineering class collected soil-aggregate samples for laboratory testing from a recycled aggregate processing plant in Palm Beach County, Florida. Three samples, denoted by Soil A , Soil B , and Soil C , were collected from three locations of the aggregate stockpile, and sieve analyses were conducted (see Figure 2.35). (a) (b) Figure 2.35 (a) Soil-aggregate stockpile; (b) sieve analysis ( Courtesy of Khaled Sobhan, Florida Atlantic University, Boca Raton, Florida ) a. Determine the coefficient of uniformity and the coefficient of gradation for Soils A , B , and C . b. Which one is coarser: Soil A or Soil C ? Justify your answer. c. Although the soils are obtained from the same stockpile, why are the curves so different? ( Hint : Comment on particle segregation and representative field sampling.) d. Determine the percentages of gravel, sand and fines according to Unified Soil Classification System.

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Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
Publisher: Cengage Learning
ISBN: 9781305970939
BuyFind

Principles of Geotechnical Enginee...

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

Solutions

Chapter
Section
Chapter 2, Problem 2.1CTP
Textbook Problem

Three groups of students from the Geotechnical Engineering class collected soil-aggregate samples for laboratory testing from a recycled aggregate processing plant in Palm Beach County, Florida. Three samples, denoted by Soil A, Soil B, and Soil C, were collected from three locations of the aggregate stockpile, and sieve analyses were conducted (see Figure 2.35).

Chapter 2, Problem 2.1CTP, Three groups of students from the Geotechnical Engineering class collected soil-aggregate samples , example  1

(a)

Chapter 2, Problem 2.1CTP, Three groups of students from the Geotechnical Engineering class collected soil-aggregate samples , example  2

(b)

Figure 2.35 (a) Soil-aggregate stockpile; (b) sieve analysis (Courtesy of Khaled Sobhan, Florida Atlantic University, Boca Raton, Florida)

a. Determine the coefficient of uniformity and the coefficient of gradation for Soils A, B, and C.

b. Which one is coarser: Soil A or Soil C? Justify your answer.

c. Although the soils are obtained from the same stockpile, why are the curves so different? (Hint: Comment on particle segregation and representative field sampling.)

d. Determine the percentages of gravel, sand and fines according to Unified Soil Classification System.

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