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Neutralization inhibition mechanism of lithium nitrite and its effect on the microstructure of mortar
The effects of calcium nitrite on corrosion inhibition of rebar in concrete have been well established. Increase in compressive strength of concrete and decrease in penetration of chloride ion have been reported. However, the effect of lithium nitrite on durability of concrete is less understood. Hence, the performance of lithium nitrite against penetration of chloride ion and neutralization in mortar were experimented. Specimens containing lithium nitrite at different replacement ratio (0%, 5%, 12.5% and 25% of total mixing water) were cured under different conditions and subjected to accelerated neutralization. Ion analysis and characterization showed a substantial increase in neutralization inhibition with the addition of lithium nitrite. The decrease in calcium and increase in lithium ions were confirmed in the regions penetrated by carbon dioxide. Under any curing condition, 25% replacement of lithium nitrite showed the presence of Li+ concentration of about 40 mg/L around the specimen surface and more than 20 mg/L at all depths after promotion of neutralization. The internal pH of mortar was maintained at 12 or above for replacement ratio above 12.5% through the production of lithium hydroxide, even if calcium hydroxide was consumed by carbon dioxide. Both Li+ and moisture content affected the degree of neutralization inhibition. (C) 2020 Elsevier Ltd. All rights reserved.
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