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MDT Project Update
March 22, 2019
Eli Cuelho
TRI Environmental
Moisture Conditioning Subgrade
Checking moisture and vanes
Tracking Subgrade in Place
Compacting Subgrade
Leveling Subgrade
Recompacing Subgrade Surface
Finished Subgrade Surface
Subgrade Measurements
2 ft.
2 ft.
2 ft.
2 ft.
2 ft.
2 ft.
A
B
C
D
E
F
Measurement Type
Vane Shear – all layers
Moisture Content – all layers
Lightweight Deflectometer – final 3 layers
Dynamic Cone Penetrometer – final layer only
Sand Cone Density – final layer only
2 ft.
2 ft.2 ft.
2 ft.
4½ ft.
Subgrade
1
3
2
1
1
4
4
5
8
9
12
13
16
17
20
21
24
2
3
6
7
10
11
14
15
18
19
22
23
1
2
3
4
5
6
1
2
3
4
5
6
2 ft.4½ ft.
2
9 10
3 4
5 6
7 8
11 12
Measurement Type
Vane Shear – all layers
Moisture Content – all layers
Lightweight Deflectometer – final 3 layers
Dynamic Cone Penetrometer – final layer only
Sand Cone Density – final layer only
Moisture Content
• 72 measurements per test section
• Average values
– Test Section 1 = 27.9%
– Test Section 2 = 28.0%
– Test Section 3 = 28.0%
• Standard deviations are around 0.6%
Vane Shear Strength
• 144 measurements per test section
• Average values
– Test Section 1 = 101.2 kPa
– Test Section 2 = 99.1 kPa
– Test Section 3 = 99.3 kPa
• Standard deviations are around 10 kPa
DCP
• Avg. per test section– Sect. 1 = 2.37
– Sect. 2 = 2.31
– Sect. 3 = 2.31
CBR = 292/(mm per blow)^1.12 [Kleyn EG July 1975]
0
6
12
18
24
30
36
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
De
pth
(in
.)
CBR (%)
1-B 1-C 1-D
1-E 1-F 2-A
2-B 2-C 2-D
2-E 2-F 3-A
3-B 3-C 3-D
3-E 3-F
LWD
• Avg. per layer*
– Layer 4 = 5.98
– Layer 5 = 4.73
– Layer 6 = 3.94
• Avg. layer 6 per test section*
– Sect. 1 = 4.17
– Sect. 2 = 3.86
– Sect. 3 = 3.84
*units are MN/mm2
0.0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
1B 1C 1D 1E 1F 2A 2B 2C 2D 2E 2F 3A 3B 3C 3D 3E 3F
Dyn
amic
Sti
ffn
ess
(MN
/mm
2)
Test Section Location
Layer 4
Layer 5
Layer 6
Excavate Hole
Driving Anchor
Subgrade Sensor
Leveling and Setting Sensor
Finished Installations
Bringing in Crushed Base Course
Installing Base Course on Geosynthetics
Hand Leveling Base Course
Base Surface after Screeding
Compacting Base Course
2 ft.
2 ft.
2 ft.
2 ft.
2 ft.
2 ft.
A
B
C
D
E
F
Measurement Type
Moisture Content – all layers
Lightweight Deflectometer – all layers
Dynamic Cone Penetrometer – final layer only
Nuclear Densometer – final layer only
Sand Cone Density – final layer only
2 ft.
2 ft.
3½ ft.
2 ft.
2 ft.
3½ ft.
3½ ft.
Base Course
1
2
1
2
3
1
2
1
2
3
4
5
6
1
2
3
4
5
6
4½ ft.2 ft.4½ ft.
Base Course Measurements
Measurement Type
Moisture Content – all layers
Lightweight Deflectometer – all layers
Dynamic Cone Penetrometer – final layer only
Nuclear Densometer – final layer only
Sand Cone Density – final layer only
