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MDT Project Update March 22, 2019 Eli Cuelho TRI Environmental - - PowerPoint PPT Presentation
MDT Project Update March 22, 2019 Eli Cuelho TRI Environmental - - PowerPoint PPT Presentation
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
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Checking moisture and vanes
SLIDE 4
Tracking Subgrade in Place
SLIDE 5
Compacting Subgrade
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Leveling Subgrade
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Recompacing Subgrade Surface
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Finished Subgrade Surface
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Subgrade Measurements
2 ft. 2 ft. 2 ft. 2 ft. 2 ft. 2 ft.
A B C D E F
– – – – – 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
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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%
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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
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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]
6 12 18 24 30 36 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Depth (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
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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
Dynamic Stiffness (MN/mm2) Test Section Location
Layer 4 Layer 5 Layer 6
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Excavate Hole
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Driving Anchor
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Subgrade Sensor
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Leveling and Setting Sensor
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Finished Installations
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Bringing in Crushed Base Course
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Installing Base Course on Geosynthetics
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Hand Leveling Base Course
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Base Surface after Screeding
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Compacting Base Course
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2 ft. 2 ft. 2 ft. 2 ft. 2 ft. 2 ft.
A B C D E F
Measurement Type – – – – – 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