From: Macrocell Corrosion Currents in Simulated Concrete Pore Solution and Reinforced Concrete
Silica flour
Fine sand 0/0.5
Medium sand 0/2
Coarse sand 0/4
Gravel 4/7
Gravel 4/12
Density (g/dm3)
2.67
2.65
2.66
2.70