Experimental study on effects of the concentration and amount of
AgNO3 solution used in the silver nitrate solution spray method on total chloride
ion concentration (Cb) contained in concrete at the discolored boundary
appeared after the AgNO3 solution spray was carried out. Cylinder specimens
made of mortar with 0.4, 0.5 and 0.6 water-cement ratio (W/C) were made.
Those were immersed in a salt water, and then split. AgNO3 solutions of 0.1,
0.075, and 0.05 mol/l were sprayed on the split surfaces. In addition to those
specimens, 0.075 mol/l AgNO3 solution was sprayed with varying amounts.
Results are such that Cb changed depending on the concentration and amount of
the AgNO3 solution sprayed. The value of Cb when about 0.015g/cm3 of AgNO3
solution with 0.075 mol/l concentration was sprayed, became almost equal to the
limit chloride ion concentration to initiate steel corrosion in concrete determined
by Horiguchi et.al