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Effect of NaCl content in immersion solution on the decalcification of cement pastes
Degradation of concrete structures can be induced by the exposure to sodium chloride solutions. The penetration of chloride ions is a major cause of the corrosion of steel reinforcement. Moreover, chloride solutions have a neutral pH, which is an additional cause of degradation as the pore solution of sound material is highly basic. The decalcification of cement pastes is presented in this paper. Particularly, the effect of the NaCl content is investigated. The experimental results by microprobe analysis show a higher decalcification rate as the NaCl concentration increases. This behavior is explained by the chemical equilibrium of portlandite and, specially, by the influence of the NaCl content on the ionic activity. Experimental results on the portlandite solubility in the presence of NaCl solutions confirm the effect of sodium chloride on leaching. Modeling simulations with the numerical model STADIUM gives reliable results in agreement with the experimental observations. Leaching on (3CaO)(SiO2) pastes were also performed to validate the simulations of the decalcification.
Effect of NaCl content in immersion solution on the decalcification of cement pastes
Degradation of concrete structures can be induced by the exposure to sodium chloride solutions. The penetration of chloride ions is a major cause of the corrosion of steel reinforcement. Moreover, chloride solutions have a neutral pH, which is an additional cause of degradation as the pore solution of sound material is highly basic. The decalcification of cement pastes is presented in this paper. Particularly, the effect of the NaCl content is investigated. The experimental results by microprobe analysis show a higher decalcification rate as the NaCl concentration increases. This behavior is explained by the chemical equilibrium of portlandite and, specially, by the influence of the NaCl content on the ionic activity. Experimental results on the portlandite solubility in the presence of NaCl solutions confirm the effect of sodium chloride on leaching. Modeling simulations with the numerical model STADIUM gives reliable results in agreement with the experimental observations. Leaching on (3CaO)(SiO2) pastes were also performed to validate the simulations of the decalcification.
Effect of NaCl content in immersion solution on the decalcification of cement pastes
Einfluss des NaCl-Gehalts in Immersionsflüssigkeit auf die Entkalkung von Zementpasten
Henocq, Pierre (author) / Samson, Eric (author) / Marchand, Jacques (author)
2007
12 Seiten, 10 Bilder, 1 Tabelle, 15 Quellen
Conference paper
English
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