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Table 5 Variation of Atterberg limits and plasticity index for the three soils with different percentages of cement content

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

Geologic unit 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
Nkporo Shale
 Plastic limit (%) 30.00 36.89 28.99 18.00 25.50  
 Liquid limit (%) 52.00 46.00 38.00 39.02 37.00 2.27
 Plasticity index (%) 22.00 9.11 9.01 21.00 11.50  
New Netin Marl
 Plastic limit (%) 33.00 33.00 30.00 37.00 30.00    
 Liquid limit (%) 48.00 44.00 37.00 46.00 47.00    6.97
 Plasticity index (%) 15.00 11.00 7.00 7.00 17.00    
Ekenpon Shale
 Plastic limit (%) 38.40 44.3 40.50 37.40 41.60    
 Liquid limit (%) 52.80 73.20 62.20 52.60 40.60    4.28
 Plasticity index (%) 14.40 28.90 21.70 15.20 9.00