Underground Infrastructure - February 2023 - 40

CIGMAT Report
TABLE 6: Summary of compacted properties of CL soil.
Compaction Method
Standard Proctor (SP)
Optimum
95% Dry
Field Compaction (FC)
95% Wet
Optimum
95% Dry
Modified Proctor (MP)
95% Wet
Optimum
95% Dry
95% Wet
Moisture Content (%)
14.6
12.5
16.9
11.8
10.1
13.6
10.3
7.6
13.3
Dry Unit Weight (lb/cu.ft)
111.5
105.9
105.9
120.0
114.0
114.0
121.7
115.6
115.6
The relationship of standard Proctor (SP) test was not even
close to the field compacted results and there was no overlapping
of results at all (FIGURE 14). The modified Proctor
(MP) test had a region of overlap with the FC on the wet side
of the compaction curve (FIGURE 14), but results were mismatched
for the rest of the curve/relationship.
Optimum Conditions. As summarized in TABLE 6 and
shown in FIGURE 14, the maximum dry unit weight (γd
was 1.7 pcf or -1.4% lower than the modi.
Degree
of Saturation (S) (%)
77.7
57.5
77.7
79.6
57.5
77.4
73.1
45.2
79.2
Void Ratio (e)
0.51
0.59
0.59
0.40
0.47
0.47
0.38
0.45
0.45
Air Voids (%)
7.49
15.70
8.23
5.82
13.63
7.24
7.41
17.05
6.49
)max
of the field compacted soil was 9.5 pcf, or 8.5% higher than
the standard compaction. The relative compaction (RC) was
1.08. The FC-γdmax
fied compaction γdmax
As summarized in TABLE 6 and shown in FIGURE 14, the
optimum moisture content wopt
of the field compacted soil
was 11.8%, which was -2.6% lower than the standard compaction.
In reality, this will prevent using excess water in the
field for compaction. The FC-wopt
modified compaction wopt
was 1.5% higher than the
.
As summarized in TABLE 6, the degree of saturation (S)
for FC was the maximum, with 79.6% and the modified compaction
had the lowest with 73.1%.
As summarized in TABLE 6, the void ratio (e) of the SP was
the highest, with 0.51. The void ratio for FC and MP were 0.40
and 0.38, respectively. Hence, the FC-e was 21.5% lower than
the SP-e. The void ratio showed the second-largest percentage
difference in the properties investigated between the FC and
SP compacted soils.
As summarized in TABLE 6, the air void ratio (Na
FC was the lowest, with 5.82. The Na
) of the
and 7.41, respectively. Hence, the FC- Na
than the SP-Na
for SP and MP were 7.49
was 28.7% lower
. The air void ratio showed the highest percentage
difference in the properties investigated between the FC
and SP compacted soils.
95% of Optimum Dry Condition. As summarized in
TABLE 6 and shown in FIGURE 14, the 95% of optimum dry
unit weight (γd
):of the FC compacted soil was 8.1 pcf, or 7.6%
higher than the SP. The relative compaction (RC) was 1.08.
The SSCC-γd
was 1.6 pcf or -1.4% lower than the MP-γd
.
As summarized in TABLE 6 and shown in FIGURE 14, the
40 FEBRUARY 2023 | UndergroundInfrastructure.com
moisture content (w) for the 95% FC compacted soil was
10.1%, which was -2.4% lower than the SP. The FC- w was
2.5% higher than the MP-w.
As summarized in TABLE 6, the degree of saturation (S)
for FC and SP was the same, with 57.5% and the modified
compaction had the lowest, with 45.2%.
As summarized in TABLE 6, the void ratio (e) of the SP
was the highest, with 0.59. The void ratio for FC and MP were
0.47 and 0.45, respectively. Hence, the FC-e was 20% lower
than the SP-e. The void ratio showed the highest percentage
difference in the properties investigated between the FC and
SP compacted soils.
As summarized in TABLE 6, the air void ratio (Na
FC was the lowest, with 13.63. The Na
) of the
15.70 and 17.03, respectively. Hence, the FC- Na
for SP and MP was
was 15%
lower than the SP-Na. The air void ratio showed the second-highest
percentage difference in the properties investigated
between the FC and SP compacted soils.
95% of Optimum-Wet Condition. As summarized in
TABLE 6 and shown in FIGURE 14, the 95% of optimum wet
unit weight of the SSCC compacted soil was 8.1 pcf, or 7.6%
higher than the SP. The relative compaction (RC) was 1.08.
The FC-γd
was 1.6 pcf or -1.4% lower than the MP-γd
.
As summarized in TABLE 6 and shown in FIGURE 14,
moisture content (w) for the 95% FC compacted soil was
13.6% which was -3.3% lower than the SP. The FC-w was
0.3% higher than the MP-w.
As summarized in TABLE 6, degree of saturation (S) for
FC and SP were very close and was about 77.5% and the
modified compaction had the highest of 79.2%.
As summarized in TABLE 6, void ratio (e) of the SP was
the highest with 0.59. The void ratio for FC and MP were
0.47 and 0.45 respectively. Hence, the FC-e was 20% lower
than the SP-e. The void ratio showed the highest percentage
difference in the properties investigated between the FC and
SP compacted soils.
As summarized in TABLE 6, air void ratio (Na
was the lowest with 7.24. The Na
6.49 respectively. Hence the FC-Na
) of the FC
for SP and MP were 8.23 and
was 12% lower than the
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