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Table 4 Unconfined compressive strength and Young’s modulus values for the three soils at different cement contents

From: Occurrence of shale soils along the Calabar-Itu highway, Southeastern Nigeria and their implication for the subgrade construction

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