A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Interaction of layered double hydroxide phases with chloride ions
AbstractFor the sustainable transition of the construction sector, the durability of cementitious materials needs to be guaranteed. This requires a fundamental understanding of the deterioration mechanisms for example how the ingress of potentially detrimental ions affects the composition of the pore solution as well as the phase assemblage. This contribution links results from several research projects investigating the changes in layered double hydroxides (LDH) composition upon exposure to chlorides. The Cl/Al ratio in chloride‐containing AFm phases depends on the chloride concentration as well as on the pH of the liquid phase. In addition, the amount of AFm phases is affected by the pH. Another member of the LDH group, hydrotalcite (Ht), can also incorporate chloride ions into the interlayer and exhibit a similar chloride‐binding capacity as stoichiometric Friedel's salt. However, the chloride‐binding capacity of Ht also depends on the composition of the pore solution. These findings aid the fundamental understanding of chloride‐binding mechanisms of cementitious materials. This is especially important, as the pH and calcium availability in the pore solution of hydrated cement may be altered during its service life. Moreover, the results may help to accurately predict the durability performance of samples in the laboratory.
Interaction of layered double hydroxide phases with chloride ions
AbstractFor the sustainable transition of the construction sector, the durability of cementitious materials needs to be guaranteed. This requires a fundamental understanding of the deterioration mechanisms for example how the ingress of potentially detrimental ions affects the composition of the pore solution as well as the phase assemblage. This contribution links results from several research projects investigating the changes in layered double hydroxides (LDH) composition upon exposure to chlorides. The Cl/Al ratio in chloride‐containing AFm phases depends on the chloride concentration as well as on the pH of the liquid phase. In addition, the amount of AFm phases is affected by the pH. Another member of the LDH group, hydrotalcite (Ht), can also incorporate chloride ions into the interlayer and exhibit a similar chloride‐binding capacity as stoichiometric Friedel's salt. However, the chloride‐binding capacity of Ht also depends on the composition of the pore solution. These findings aid the fundamental understanding of chloride‐binding mechanisms of cementitious materials. This is especially important, as the pH and calcium availability in the pore solution of hydrated cement may be altered during its service life. Moreover, the results may help to accurately predict the durability performance of samples in the laboratory.
Interaction of layered double hydroxide phases with chloride ions
ce papers
Machner, Alisa (author)
ce/papers ; 6 ; 1254-1264
2023-12-01
Article (Journal)
Electronic Resource
English
Ion exchange of different phosphate ions into the zinc-aluminium-chloride layered double hydroxide
| British Library Online Contents | 1999
Layered double hydroxide film and composite material containing layered double hydroxide
| European Patent Office | 2019
Chloride Binding Capacity of Cement Paste Containing Layered Double Hydroxide (LDH)
| British Library Online Contents | 2012