The effectiveness of Ca (NO
2)
2 and N
aNO
2 as a corrosion inhibitor has been confirmed. However, it may be important from the viewpoint of corrosion of reinforcement in the concrete contaminated with Cl
- ion to reveal the behavior of NO
2- ion in relation to Cl
- ion concentration in pore solutions in concrete. In this study, the analyses of pore solution in NaCl containing-mortars with and without inhibitor were carried out to elucidate effects of the inhibitors on the chloride binding capacity of mortars. NO
2- ion concentrations in the pore solution in NaCl-containing mortars treated with 1% Ca (NO
2)
2 by mass of cement were lower than in the corresponding mortars with NaNO
2. The addition of NaNO
2 a little raised OH
- ion concentration, but OH
- ion concentration was reduced in the mortars containing Ca (NO
2)
2. However, Cl
-/NO
2- ratio in the pore solutions in mortars containing Ca (NO
2)
2 were lower than in mortars containing NaNO
2 because of the dissipation of greater amounts of Cl
- ions from the pore solutions in the former than in the latter.
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