A Study on the Protection of Steel in Concrete by Penetrative Corrosion Inhibitor

This study aimed to clarify the influence of the type and concentration of nitrite-type repair materials on ion penetrability in cement mortar. The permeability test for various repair material was carried out in order to compare the physical permeability of nitrite-type repair materials. In addition, repaired mortar specimens were prepared for ion penetrability test using nitrite-type repair material, and the amount of penetration of nitrite and lithium ions were measured under outdoor and indoor conditions. As a result, the impregnation of a lithium nitrite solution became larger than that of a calcium nitrite solution in the permeability test. Moreover, when the nitrite-type repair material was directly coated on the surface of mortar specimen, it was confirmed that the amount of penetration of nitrite ions of a lithium nitrite solution became larger than that of a calcium nitrite solution. It is thought that a coexisting positive ion affects the penetration property of nitrite ions in hardened cement mortar.

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Fundamental Study on the Penetrability of Nitrite-Type Repair Materials into Mortar

Inoue

Sudoh

Choi

et al. 2017

J. Soc. Mat. Sci., Japan

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A Study on Repression Effect of Polymer Cement Mortar Containing Lithium Nitrite for Salt Attack and Carbonation on Concrete

Fukuda

Hamasaki

Masuda

et al. 2021

Nihon Kenchiku Gakkai Kozokei Ronbunshu

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The lithium nitrite-containing mortar surface coating method was exposed along the coast of Okinawa for 27 years. The surface coating method suppressed the progress of carbonation of concrete; it was also inhibited penetration of concrete airborne salt. In addition, the added nitrite ion was retained.Using the diffusion equation proposed by the authors, we verified nitrite and chloride ions and carried out a 100-year simulation.The molar ratio of the amount of nitrite ion to the amount of chloride ion was the molar ratio having the effect of suppressing the corrosion of the reinforcing bar.

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Outdoor Exposure Test on the Salt Damage Repression Effect of Polymer Cement Mortar Containing Lithium Nitrite

Fukuda¹,

Masuda²,

Kage³

2011

AIJ J. Technol. Des.

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Sugio FUKUDAYosihiro MASUDA Tadatsugu KAGEThe mortar spreading method, to which the high density lithium nitrite solution added, applied actual size substrates were exposed along the coast of Okinawa and the repression effect of salinity infiltration was evaluated. This method had repressed the infiltration of flying salinity form the Sea for approx. 15 years. It was estimated that the salinity infiltration had been repressed because pores in the mortar had become finer and the gap had been filled with the water. Moreover, it was confirmed that little sub-nitrate ion in mortar eluted from the surface of this mortar and diffusion factor in the mortar was low. The mortar spreading method, to which the high density lithium nitrite solution added, applied actual size substrates were exposed along the coast of Okinawa and the repression effect of salinity infiltration was evaluated. This method had repressed the infiltration of flying salinity form the Sea for approx. 15 years. It was estimated that the salinity infiltration had been repressed because pores in the mortar had become finer and the gap had been filled with the water. Moreover, it was confirmed that little sub-nitrate ion in mortar eluted from the surface of this mortar and diffusion factor in the mortar was low.

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A Study on the Protection of Steel in Concrete by Penetrative Corrosion Inhibitor

Cited by 4 publications

References 2 publications

Fundamental Study on the Penetrability of Nitrite-Type Repair Materials into Mortar

Fundamental Study on the Penetrability of Nitrite-Type Repair Materials into Mortar

A Study on Repression Effect of Polymer Cement Mortar Containing Lithium Nitrite for Salt Attack and Carbonation on Concrete

Outdoor Exposure Test on the Salt Damage Repression Effect of Polymer Cement Mortar Containing Lithium Nitrite

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