Chloride Limits and Thresholds for Concrete: Perspectives in Laboratory Testing and Modeling Techniques-Examining Factors that Influence Service Life Model Predictions (Recorded presentation)

Examining Factors that Influence Service Life Model Predictions (Recorded presentation)

Video Transcription

Video Summary

The presentation focuses on understanding factors influencing the service life of concrete structures, with emphasis on chloride binding and its impact on corrosion. The talk primarily explores the binding isotherms, examining how they relate to the apparent diffusion coefficients in empirical and physiochemical service life models. Two primary chloride-binding reactions are considered: the typical Friedel’s salt interactions and calcium oxychloride formation, which become significant at lower temperatures. SCMs (supplementary cementitious materials) are included in the analysis due to their effect on reducing calcium oxychloride formation, considered crucial for preventing structural damage. The phase behavior of calcium chloride and its impact on chloride binding is discussed using phase diagrams. Finally, the presentation suggests using SCMs and possibly carbonation as a mitigation strategy to enhance concrete durability by reducing deleterious chloride binding phases. Overall, it emphasizes understanding the complexities of chloride binding in concrete to improve modeling accuracy and extend structure longevity.

Keywords

chloride binding

corrosion

service life models

Friedel’s salt

calcium oxychloride

supplementary cementitious materials