Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 2, Problem 2.15P
Repeat Problem 2.14 with the following values: Gs = 2.75, temperature of water = 21°C, t = 88 min, and L = 11.7 cm.
2.14 A hydrometer test has the following result: Gs = 2.65, temperature of water = 26° C, and L = 10.4 cm at 45 minutes after the start of sedimentation (see Figure 2.25). What is the diameter D of the smallest-size particles that have settled beyond the zone of measurement at that time (that is, t = 45 min)?
Figure 2.25 ASTM 152H type of hydrometer placed inside the sedimentation cylinder (Courtesy of Khaled Sobhan, Florida Atlantic University, Boca Raton, Florida)
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In a hydrometer test, the results are as follows: Gs = 2.60, temperature of water = 24°C, R = 43 (K= 0.0132, L =9.2 cm) at 60 mins after the start of sedimentation. What is the diameter D, of the smallest-size particles that have settled beyond the zone of measurement at that time (that is, t = 60 min.)?
Please answer all
1. List the three corrections which should be applied to the hydrometer readings.
2. Why is it important to remove the hydrometer from the measuring cylinder between readings?
3. A hydrometer test has the following results; Gs = 2.70, temperature = 240C, and L = 92 mm at 60 minutes after the start of sedimentation. Calculate the diameter of the smallest-size particles that have settled beyond the zone of measurement at that time (use the table in the lab manual to find, A=0.0128).
D(mm) = A sqrt( L(cm) / t(min) )
Opening(mm)
Mass of soil retained on each sieve (g)
4.75
18.0
2
22.0
0.85
40.0
0.425
22.0
0.25
27.0
0.15
30.0
0.075
12.0
0.02
29.0
0.006
21.0
Pan
30.0
Based on this result, plot the particle-size distribution curve and determine the following:i) The percentage passing for each of the sieve size.ii) D10, D30 and D60 from the particle-size distribution curve.iii) The uniformity of coefficient, Cu and the coefficient of gradation, Cc.iv) Classify the soil using the British Standard Soil Classification System if the liquid limitand plasticity limit of the soil are 63% and 22%.
Refer Figure 1
Chapter 2 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
Ch. 2 - For a gravel with D60 = 0.48 mm, D30 = 0.25 mm,...Ch. 2 - Prob. 2.2PCh. 2 - Prob. 2.3PCh. 2 - The following are the results of a sieve analysis....Ch. 2 - Repeat Problem 2.4 with the following data. 2.4...Ch. 2 - Repeat Problem 2.4 with the following data. 2.4...Ch. 2 - Repeat Problem 2.4 with the following data. 2.4...Ch. 2 - The following are the results of a sieve and...Ch. 2 - Repeat Problem 2.8 using the following data. 2.8...Ch. 2 - Repeat Problem 2.8 using the following data. 2.8...
Ch. 2 - The grain-size characteristics of a soil are given...Ch. 2 - Repeat Problem 2.11 with the following data. 2.11...Ch. 2 - Repeat Problem 2.11 with the following data. 2.11...Ch. 2 - A hydrometer test has the following result: Gs =...Ch. 2 - Repeat Problem 2.14 with the following values: Gs...Ch. 2 - Three groups of students from the Geotechnical...Ch. 2 - Refer to Problem 2.C.1. Results of the sieve...
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