Geosynthetics June/July 2019 - 27

outdoors in a 12 × 100-foot (3.7 × 30.5m) test strip and subsequently cut to size
and placed in the box.
ERDC performed a quality control
test during the construction of each of
the 10 test items to minimize construction variability and ensure target values
were achieved. The as-constructed, preloaded material properties are presented
in Table 4.

Percent by Weight Passing Sieve
Sieve Designation

AC 150/5370-10H
(Gradation 2)

Phase I

Phase II

1 inch (25 mm)

-

100

100

Geosynthetic material
properties
A total of five geosynthetic products
(GP) were selected, as shown in Figures
3a-3e on page 28, consisting of four
geogrids and one geotextile, to serve
the function of reinforcement/stabilization within the pavement structure. The
geogrid products consisted of GP 1, a
punched polypropylene sheet oriented in
Test Item No.

3/4 inch (19 mm)

100

100

100

1/2 inch (12.5 mm)

90-100

97

95

3/8 inch (9.5 mm)

72-88

86

87

No. 4 (4.75 mm)

53-73

55

57

No. 8 (2.6 mm)

38-60

37

37

No. 16 (1.18 mm)

26-48

26

No. 30 (600 μm)

18-38

20

19
12

No. 50 (300 μm)

11-27

13

No. 100 (150 μm)

6-18

8

No. 200 (75 μm)

3-6

5

5.3

VMA (%)

15

13

14.1

Binder Grade

76-22

76-22

Asphalt Content

5.2

5.4

RAP (%)

11

11

RAP AC (%)

5.6

5.6

TABLE 3 Five inches (127 mm) of P-401 HMA design comparison

Test Item 1 Test Item 2 Test Item 3 Test Item 4 Test Item 5 Test Item 6 Test Item 7 Test Item 8 Test Item 9 Test Item 10

Phase No.

Phase I

Phase I

Phase I

Phase I

Phase II

Phase II

Phase II

Geosynthetic Product (GP)

None

GP 1

GP 2

GP 3

None

None

GP 1

Geosynthetic Placement Location

N/A

N/A

N/A

Base Course/Subbase Interface

Phase II

Phase II

Phase II

GP 2

GP 4

GP 5

Subbase/Subgrade Interface

CH Subgrade Properties
Thickness (inches)

27.8

28.9

28.4

28

27.8

28

27.9

28

28.1

28.1

Compaction (%)

82

83.5

84.6

85

79.9

76.8

78

80.4

79.4

79.4

Moisture Content (%)

35.4

38.3

36.9

36.8

38.2

40.7

38

38.6

39.2

38

CBR (%)

3.6

3.4

3.2

3.1

2.9

1.8

3

2.9

2.9

2.8

Thickness (inches)

12.2

12.4

12.3

12.4

12.1

12

12

12

11.9

12.1

Compaction (%)

99.4

97.9

98.7

99

95.8

99.5

100

95.7

98.6

97.7

Moisture Content (%)

5.8

5.8

5.9

4.2

4.3

5

2.3

4.1

3.5

3.2

CBR (%)

15

15

18

15

18

18

18

16

17

17

Thickness (inches)

7.1

6

6.7

6.7

6.8

6.8

6.9

6.9

7

6.9

Compaction (%)

92.8

95.3

94.3

95.3

91.5

92.5

92.4

92

92.2

93

Moisture Content (%)

5.1

4.8

5.1

4.8

2.5

1.3

2

2.1

0.9

1.3

P-154 Subbase Properties

P-209 Base Course Properties

P-401 HMA Properties
Thickness (inches)

4.8

5

5.1

5.1

5.3

4.9

4.9

5.2

5.2

4.9

Density (%)

91.2

91.2

91.2

91.2

94.5

94.5

94.5

94.5

94.5

94.5

Average Air Voids (%)

8.8

8.8

8.8

8.8

5.5

5.5

5.5

5.5

5.5

5.5

TABLE 4 As-constructed material properties
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