Effect of nitrate and nitrite on the dissolution kinetics of iron sulfides in alkaline solutions
Oxidation of iron sulfide-bearing aggregates has been reported to cause extensive damage in numerous concrete structures worldwide. Despite the efforts made to develop testing methods for identifying the reactivity of iron sulfide minerals in concrete, existing mitigation strategies to prevent the deterioration in concrete structures are limited. This work aims to explore potential mitigation strategies by investigating the role of potassium nitrate and nitrite on iron sulfide oxidation using a model reactant system. Specifically, their effects on the dissolution kinetics of iron sulfides (i.e., pyrrhotite and pyrite) in highly alkaline solutions are uncovered. Experimental results show that the addition of potassium nitrate did not exhibit a profound influence on the dissolution kinetics, whereas the use of potassium nitrite significantly slowed down the dissolution. The effectiveness of nitrite in reducing the dissolution kinetics of iron sulfides under alkaline environments suggests its potential application as an inhibition admixture for iron sulfide oxidation in concrete.
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| Work Title | Effect of nitrate and nitrite on the dissolution kinetics of iron sulfides in alkaline solutions |
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| License | In Copyright (Rights Reserved) |
| Work Type | Conference Proceeding |
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| Publication Date | September 2023 |
| Deposited | March 01, 2025 |
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