Table 4 Unconfined compressive strength and Young’s modulus values for the three soils at different cement contents
Location | Geologic unit | Unconfine compression value | 0 % Ordinary Portland cement | 2 % Ordinary Portland cement | 3 % Ordinary Portland cement | 5 % Ordinary Portland cement | 7 % Ordinary Portland cement | 10 % Ordinary Portland cement | 12 % Ordinary Portland cement | pH value |
|---|---|---|---|---|---|---|---|---|---|---|
A | Nkporo Shale | Lowest qu (kPa) | 30.28 | 30.28 | 60.56 | 60.54 | 121.13 | 30.27 | 60.54 | 2.27 |
Peak, qu (kPa) | 784.19 | 604.19 | 302.22 | 692.87 | 531.25 | 240.99 | 3414.90 | |||
B | New Netim Marl | Lowest qu (kPa) | 48.41 | 121.08 | 605.41 | 666.21 | 665.14 | 6.97 | ||
Peak, qu,(kPa) | 674.53 | 743.76 | 2172.48 | 2498.33 | 2822.90 | |||||
C | Ekenkpon Shale | Lowest qu (kPa) | 72.65 | 30.27 | 66.62 | 60.56 | 181.69 | 4.28 | ||
Peak (kPa) | 350.57 | 446.73 | 963.95 | 845.17 | 1806.68 | |||||
Young’s modulus values (MPa) | ||||||||||
A | Nkporo Shale | At lowest qu | 75.71 | 75.71 | 151.41 | 151.41 | 300.40 | 37.53 | 75.68 | |
At peak qu | 178.23 | 215.78 | 125.92 | 115.43 | 146.39 | 42.69 | 304.90 | |||
B | Ekenkpon Shale | At lowest qu | 40.34 | 151.35 | 756.76 | 1665.53 | 329.91 | |||
At peak qu | 112.42 | 371.88 | 543.12 | 477.50 | 343.51 | |||||
C | New Netim Marl | At lowest qu | 90.81 | 37.53 | 165.22 | 150.20 | 450.60 | |||
At peak qu | 146.07 | 123.10 | 170.76 | 477.50 | 298.70 |