Lab 6C- Compaction Problems
Complete and turn in your work on paper.
Problems 5.1-5.6, Chapter 5 Compaction (pages 82-83 of the textbook)
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5.1 At a borrow site, sandy soil was excavated. The soil had t
= 19.3 kN/m3,
w = 12.3%, and Gs = 2.66. The soil was dried, the maximum and minimum void ratio tests were performed, and emax = 0.564 and emin = 0.497
were obtained. Determine the relative density of the soil at the
borrow site.
5.2 The soil in Problem 5.1 is used to fill an earthwork, and 75% of relative density is required in the field compaction with 10% water content.
Determine the required total unit weight of the soil t
for this earthwork.
5.3 For a given soil with Gs = 2.65, plot the d versus w relations for S = 40%, 60%, 80%, and 100% for a range of w = 0% to 20%.
5.4 The standard Proctor test was performed for a soil with Gs = 2.66, and
the results are as follows:
Water
Content, %
Moist Weight
in Mold, gf
5.6 1420
7.9 1683
10.8 1932
13.3 1964
14.8 1830
16.2 1630
(a) Plot the d versus w relation.
(b) Determine d,max and wopt.
(c) Calculate S and e at the maximum dry unit weight point.
Compaction 83
(d) What is t
at wopt?
(e) What is the range of water content if the relative compaction (R.C.)
is required to be 90% of the standard Proctor d,max?
5.5 The modified Proctor test (ASTM D 698, method C) was performed for
a soil with Gs = 2.70, and the results are as follows:
Water Content, %Moist Weight in Mold, gf
6.5 3250
9.3 3826
12.6 4293
14.9 4362
17.2 4035
18.6 3685
(a) Plot the d versus w relation.
(b) Determine d,max and wopt.
(c) Calculate S and e at the maximum dry unit weight point.
(d) What is t
at wopt?
(e) What is the range of water content if the relative compaction (R.C.)
is required to be 95% of the modified Proctor d,max?
5.6 The following table shows a standard Proctor test result. Soil type was
SW according to USCS. The soil is used for filling a small trench that
was excavated in a parking lot. Determine the required d and the range
of water content for this job. Use Table 5.4 as a guideline.
Water Content, %Dry Unit Weight
d, kN/m3
3.5 14.3
6.2 16.8
9.2 18.6
12.5 18.7
15.3 17.6
18.6 14.6
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