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 Surface

Subgrade Measurements Subgrade 2 1 1 1 A 2 ft. 1 2 3 4 6 5 2 2 4 2 ft. Measurement Type B 3 2 ft. 2 ft. 7 8 Vane Shear – all layers 1 2 Moisture Content – all layers 10 9 3 3 6 2 ft. C 5 Lightweight Deflectometer – final 3 layers 11 12 Dynamic Cone Penetrometer – final layer only 14 13 Sand Cone Density – final layer only 4 4 2 ft. 8 D 7 2 ft. 2 ft. 15 16 4 3 18 17 5 5 E 2 ft. 10 9 19 20 22 21 6 6 F 2 ft. 11 12 23 24 2 ft. 4½ ft. 4½ ft. – – – – –

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 CBR (%) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 • Avg. per test 0 section 1-B 1-C 1-D 6 – Sect. 1 = 2.37 1-E 1-F 2-A 12 – Sect. 2 = 2.31 2-B 2-C 2-D Depth (in.) – Sect. 3 = 2.31 18 2-E 2-F 3-A 24 3-B 3-C 3-D 30 3-E 3-F 36 CBR = 292/(mm per blow)^1.12 [Kleyn EG July 1975]

LWD 8.0 • Avg. per layer* 7.0 – Layer 4 = 5.98 6.0 Dynamic Stiffness (MN/mm 2 ) – Layer 5 = 4.73 5.0 – Layer 6 = 3.94 4.0 • Avg. layer 6 per 3.0 test section* 2.0 – Sect. 1 = 4.17 Layer 4 Layer 5 1.0 – Sect. 2 = 3.86 Layer 6 – Sect. 3 = 3.84 0.0 1B 1C 1D 1E 1F 2A 2B 2C 2D 2E 2F 3A 3B 3C 3D 3E 3F Test Section Location *units are MN/mm 2

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

Base Course Measurements Base Course 1 A 2 ft. 1 3½ ft. 2 1 2 ft. B 2 Measurement Type 2 ft. 2 ft. Moisture Content – all layers 1 2 Lightweight Deflectometer – all layers 3 2 ft. C 3 Dynamic Cone Penetrometer – final layer only 3½ ft. Nuclear Densometer – final layer only 3 Sand Cone Density – final layer only 4 2 ft. D 4 2 ft. 2 ft. 2 1 5 E 2 ft. 2 5 3½ ft. 6 F 2 ft. 6 2 ft. 4½ ft. 4½ ft. Measurement Type – – – – –