Chloride ions adsorption and desorption in pore solution with various PH values

Author(s): In-Seok Yoon, Tatsuhiko Saeki, Sang-Soon Park
Paper category: Conference
Book title: 2nd International conference on Microstructural-related Durability of Cementitious Composites
Editor(s): Guang Ye, K. Van Breugel, Wei Sun, Changwen Miao
Print ISBN: 978-2-35158-129-2
e-ISBN: 978-2-35158-123-0
Publisher: RILEM Publications SARL
Pages: 648-655
Total Pages: 7
Language: English

Chloride binding is very ambiguous in the mechanisms of deterioration of concrete exposed to marine environment. It is expected that chloride adsorption with cement hydrates depends on pH value of pore solution. However, adsorbed chloride ions can be dissolved in concrete under the combined deterioration environment of carbonation and chloride penetration. In the condition, the most crucial issue is the amount of dissolved chloride ions in cement paste due to carbonation. Since chloride ions can be primarily adsorbed in C-S-H phase and AFm phase, the dissolution of adsorbed chloride ions should be examined with the cement hydrates.
In this study, adsorption / desorption reaction experiment set-up was designed to quantify the effect of pH of aqueous phase on chloride adsorption and desorption of adsorbed chloride ions due to carbonation. Based on the experiment results, the final goal of this study is to develop integrated system for predicting chloride adsorption /desorption behaviors.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00