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  4. How does the pore solution chemistry influence the passivation of reinforced alkali‐ and salt‐activated slag materials?
 
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2024
Journal Article
Title

How does the pore solution chemistry influence the passivation of reinforced alkali‐ and salt‐activated slag materials?

Abstract
Service life predictions of reinforced concrete structures are underpinned by the passivation film chemistry, structure, and thickness. In this work, we present how the formation of passive films at the steel-concrete interface of reinforced alkali- and salt-activated slag materials can be affected by the pore solution chemistry, namely, pH, Eh, and chemical composition. Thermodynamic simulations are used to illustrate the time-dependent changes to the pore solution chemistry, where estimated electrical conductivities of the pore solution are used as a single-value parameter to understand the solution complexity and capacity for charge transfer. A set of passivation reactions are proposed to understand the effects of OH- and HS- (reduced sulfur species) competition on the passivation pathways. These passivation reactions become more complex considering that a reducing pore solution might not establish until 3 days into the curing process - a crucial factor explaining the significant differences in the phase composition of passive films of activated slag materials (FeOOH, FeS). This study sheds light on recent progress in understanding these initial passivation reactions, emphasizing the essential role of material design and, therefore, the pore solution chemistry of these cements, along with significant insights for vital research and development concerning the corrosion durability of activated slag materials.
Author(s)
Gevaudan, Juan Pablo
The Pennsylvania State University, Department of Architectural Engineering
Timounay, Yousra
The Pennsylvania State University, Department of Architectural Engineering
Mayrhofer, Leonhard
Fraunhofer-Institut für Werkstoffmechanik IWM  
Zarshenas, Mohammad
Fraunhofer-Institut für Werkstoffmechanik IWM  
Moseler, Michael  
Fraunhofer-Institut für Werkstoffmechanik IWM  
Journal
Journal of the American Ceramic Society  
Project(s)
Passive layER FailuRe Mechanisms for Steel Embedded in Alkali-Activated Slag Materials  
Funder
European Commission  
Open Access
DOI
10.1111/jace.19342
Additional full text version
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Language
English
Fraunhofer-Institut für Werkstoffmechanik IWM  
Keyword(s)
  • alkali-activation

  • characterization

  • corrosion

  • passivation

  • salt-activation blast furnace slag

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