G MS THESIS_final version_Maxim Prokudin.pdf - Digital Repository ...

82scale aggregate piers to feature a void ratio value of 0.33 and dry unit weight of 2,100 kg/m 3(Pham and White, 2007). Thus, knowing the target parameters, a direct shear test wasperformed on the scaled aggregate mix sample where density and void ratio values weredetermined. As the direct shear test was performed according with ASTM D3080-04guidelines, the sample was tested at 35, 70 and 100 kPa and an average value for void ratio of0.32 and dry density of 2,015 kg/m 3 was obtained (Table 22).Table 22: Direct shear test initial density and void ratio of scaled aggregate piermaterial34.5 kPa 69 kPa 103 kPa AverageDiameter, cm 6.33 6.33 6.33 -Area, cm 2 31.46 31.46 31.46 -Initial height, cm 1.90 2.38 2.16 -Initial Volume, m 3 5.98E-05 7.49E-05 6.80E-05 -Mass sample, mold+2p+2s, g 2,176.90 2,176.90 2,176.80 -Mass mold+2p+2s, g 2,044.20 2,044.20 2,044.20 -Initial Weight of sample, kg 0.12 0.15 0.14 -Dry unit weight, kN/m 3 19.86 19.39 20.06 19.77Dry density, kg/m 3 2,024 1,977 2,045 2,015Initial void ratio 0.31 0.34 0.30 0.32Initial Dry Density, kg/m 3 2,024 1,976 2,045 -The image of the tested scaled limestone direct shear sample is provided in Figure 47.(a)(b)Figure 47: (a) Direct shear machine and (b) scaled aggregate sample after shearing