Cold in Place Rock Crushing and Stabilization of Northern Low ...

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Berthelot, Gerbrandt, Safronetz, and Sparks. Page: 3FIGURE 1 Highway 918-01 Typical Boulders In Grade and Along Road EdgeFIGURE 2 Highway 918-01 Typical Unstable Sand Subgrade
Berthelot, Gerbrandt, Safronetz, and Sparks. Page: 4In situ subgrade soil samples were retrieved from Highway 918-01. The resulting grain size analysis from eachsample is illustrated in Figure 3. As seen in Figure 3, Highway 918-01 subgrade is comprised of uniform sand withapproximately 15 to 20 percent fines. Atterburg limit characterization of the fines portion determined the fines portion tobe non-plastic. AASHTO classification determined the subgrade to be non-plastic fine sand (A-3) and the Unified SoilClassification System determined the subgrade to be poorly graded sand with high non-plastic fines content (SM).Standard Proctor moisture density characterization was performed as per ASTM protocols and is shown in Figure 4. Ascan be seen in Figure 4, the optimum standard proctor density was found to be approximately 2070 kg/m 3 at 7.5 percentmoisture content and the optimum modified proctor density was found to be approximately 2160 kg/m 3 at 6.5 percentmoisture content.100908070% Passing6050403020100.075 .25.15.425.852.04.75 6.3Sieve Size 0.45 (mm)9.512.519.0Kilometer 10 Kilometer 20FIGURE 3 Highway 918-01 in situ Subgrade Grain Size Distribution
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Cold in Place Rock Crushing and Stabilization of Northern Low ...

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