International Concrete Abstracts Portal

Title: Chloride Desorption Isotherms of Cementitious Systems Exposed to Low-pH Environments

Author(s): Mahmoud Shakouri and Mohammad Teymouri

Publication: CRC

Volume:

Issue:

Appears on pages(s): 139

Keywords:

DOI:

Date: 8/5/2025

Abstract:
In FA15 and FA30 pastes, a higher chloride disassociation was observed in NaCl solutions than in CaCl₂ and MgCl₂. The results for SG25 and SG50 revealed that, regardless of cation type, the inclusion of higher slag increased the chloride binding and reduced the percentages of released bound chlorides. The desorption results revealed that an increased silica fume content from 5 to 10% enhanced the chloride binding capacity and dissociation behavior. The inclusion of SCMs is a trade-off between achieving higher binding and releasing higher chloride content and lowering the system's buffer capacity due to the consumption of a considerable amount of portlandite. Chloride disassociation is influenced by the binder composition, cation type, and pH.