Vibrated Reinforced Concrete For Substructures and Superstructures. Concrete Mix Ratio 1:2:4 (Class 20/20): Shs 13,600 per Cubic Metre in the Western region, Shs 12,750 per Cubic Metre in the Nairobi region, and Shs 13,625 per Cubic Metre in the Coastal Region. Concrete Mix Ratio 1:1:2 (Class 30/20): Shs 18,000 per Cubic Metre in …Web