Experimental Study of Leaching and Penetration of Nitrite ions in Nitrite-type Repair Materials on the Surface of Concrete

  • Masumi Inoue Department of Civil and Environmental Engineering, Kitami Institute of Technology, Hokkaido, Japan
  • Heesup Choi Department of Civil and Environmental Engineering, Kitami Institute of Technology, Hokkaido, Japan
  • Yuhji Sudoh Chemicals Division. Basic Chemicals Department, Nissan Chemical Industries, Ltd., Tokyo, Japan
  • Koichi Ayuta Department of Civil and Environmental Engineering, Kitami Institute of Technology, Hokkaido, Japan
Keywords: Nitrite-type repair material, nitrite ion, leaching, penetration, polymer cement mortar, polymer cement paste

Abstract

This study aimed to clarify the leaching properties of nitrite ions in nitrite-type repair materials exposed to rainfall. Repaired concrete specimens were prepared for leaching tests using a lithium nitrite solution, and the amounts of leaching and penetration of nitrite ions were measured under simulated rainfall. The results demonstrated that the amount of leaching could be controlled by using polymer cement paste and mortar surface coatings containing lithium nitrite solution, and by using polymer cement mortar surface coatings following direct lithium nitrite solution coatings. Furthermore, the amount of nitrite ion leaching in all cases was lower than the discharge standard value established by the water pollution control law.

References

A. M. Rosenberg, et al., “A corrosion inhibitor formulated with calcium nitrite for use in reinforced concrete,” ASTM, STP 629, pp. 89-99, 1977.

A. Kobayashi, S. Ushijima, I. Kamuro, and M. Koshikawa, “A study on the protection of steel in concrete by penetrative corrosion inhibitor,” Journal of Japan Society of Civil Engineers, vol. 1990, no. 420, pp. 51-60, 1990.

T. Hori, S. Yamasaki, and Y. Masuda, “A study on the corrosion inhibiting effect of mortar with high nitrite content,” Concrete Research and Technology, vol. 5, no. 1, pp. 89-98, 1994.

Published
2017-01-01
How to Cite
[1]
M. Inoue, H. Choi, Y. Sudoh, and K. Ayuta, “Experimental Study of Leaching and Penetration of Nitrite ions in Nitrite-type Repair Materials on the Surface of Concrete”, Adv. technol. innov., vol. 2, no. 1, pp. 22-24, Jan. 2017.
Section
Articles