Modification on the chloride binding capacity of alkali activated slag by applying calcium and aluminium containing phases

Yang, Tingli; Fan, Xiucai; Gao, Xiaojian; Gu, Qiang; Xu, Shengyuan; Shui, Zhong He

doi:10.1016/j.conbuildmat.2022.129427

Cited by 14 publications

(7 citation statements)

References 59 publications

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“…Either excessive or low Ca/Al will lead to insufficient supply of calcium or aluminum, which further affects the chloride binding capacity [23]. Similar tendency was also observed in alkali activated system [24].…”

Section: Introductionsupporting

confidence: 58%

Improving the chloride binding capacity of alkali activated slag by calcium and aluminum enriched minerals

Fan¹,

Wang²,

Yu³

et al. 2023

Journal of Building Engineering

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Section: Introductionsupporting

confidence: 58%

Improving the chloride binding capacity of alkali activated slag by calcium and aluminum enriched minerals

Fan¹,

Wang²,

Yu³

et al. 2023

Journal of Building Engineering

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“…As the concentration of AO increased, the chloride ion adsorption capacity increased and the mechanical performance also improved (Wang et al, 2019b). In addition, there was a study on the adsorption and movement of chloride ions using AO/nano-Al 2 O 3 in parallel with CaO or Ca(OH) 2 (Fan et al, 2023;Yang et al, 2022). Based on the results of these previous studies, in this study, the concentrations of Ca(OH) 2 were selected as 5 and 10% (Yang et al, 2022).…”

Section: Methodsmentioning

confidence: 99%

Hydration Characteristics of Slag-Ca(OH)2-Al2O3 Binder in a 60 °C Curing Environment with Brine as Mixing Water

Kang,

Kim,

Park

et al. 2024

Int J Concr Struct Mater

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Recently, research results on PC-based or alkali-activated slag cement (AASC) using seawater as mixing water have been reported. Unlike seawater, reverse osmosis brine (brine) is waste discharged into the ocean from seawater desalination plants. There is a need to develop new and effective methods of disposing or utilizing brine to reduce marine pollution, protect marine ecosystems, and increase marine plant construction. However, research on cement or concrete using brine as a mixing water is very limited. Brine has almost the same composition as seawater, and the ion concentration is 2–4 times higher. Therefore, it is believed that new methods of using brine can be investigated and developed based on existing research and experimental results on seawater. The effects of brine and aluminum oxide (AO) on activated slag with calcium hydroxide (CH) were investigated for hydration and mechanical properties. 5% and 10% of CH were used, and samples using fresh water (FC) were prepared at the same time for comparison with brine. The slag sample without CH has a low initial (1 and 3d) strength of about 10 MPa for both FC and brine, but increases rapidly from 7d. Incorporation of CH was effective in improving the mechanical performance of FC and brine samples. In addition, the brine sample exhibited higher strength than the FC sample because it formed fewer C3AH6 phases that cause volume instability than the FC sample and affected the hydration promotion of slag particles. And more calcite phases were observed in the brine samples than in the FC samples. Through this study, the possibility of using brine as a building material was confirmed. In addition, the effect of chloride ion adsorption of slag mixed with AO and CH on the physical properties and mechanical performance of the hydration reaction was confirmed.

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“…In AAS, the total physical adsorption of chloride ions was found to account for more than 50% of the total solidification . For chloride chemical binding, it mainly results from the ion exchange between chloride ions and interlayer anions of AFm phases in AAS to form Friedel’s salt, Kuzel’s salt, and chloride intercalated hydrotalcite. ,, The chloride chemical binding capacity could be increased by incorporating calcium and aluminum containing phases and minerals into AAS. , This is due to the promoted formation of Friedel’s salt in the exposure of chloride solution.…”

Section: Introductionmentioning

confidence: 99%

“…6,12,13 The chloride chemical binding capacity could be increased by incorporating calcium and aluminum containing phases and minerals into AAS. 4,14 This is due to the promoted formation of Friedel's salt in the exposure of chloride solution.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study and Numerical Modeling of the Solidification Capacity of Chloride Ions in Alkali-Activated Slag Cement Exposed to Sodium Chloride

Zuo,

Liu,

et al. 2024

ACS Sustainable Chem. Eng.

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The effects of chloride concentration and alkali activator on the phase alteration and chloride solidification capacity of alkali-activated slag (AAS) cement exposed to sodium chloride were investigated by multiple experimental techniques and thermodynamic modeling. In the meantime, a novel model considering the binder composition and solution chemistry was developed for the first time to predict the chloride solidification capacity of AAS. The experimental results were presented, discussed, and used to validate the model. A good agreement was found in the comparisons, showing R 2 ≥ 0.93. The model was then implemented to study the effect of slag chemistry, and it revealed that increasing CaO content in slag increased the physical adsorption capacity, while the slag with high contents of Al2O3 and MgO exhibited larger chemical binding capacity.

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Modification on the chloride binding capacity of alkali activated slag by applying calcium and aluminium containing phases

Cited by 14 publications

References 59 publications

Improving the chloride binding capacity of alkali activated slag by calcium and aluminum enriched minerals

Improving the chloride binding capacity of alkali activated slag by calcium and aluminum enriched minerals

Hydration Characteristics of Slag-Ca(OH)2-Al2O3 Binder in a 60 °C Curing Environment with Brine as Mixing Water

Experimental Study and Numerical Modeling of the Solidification Capacity of Chloride Ions in Alkali-Activated Slag Cement Exposed to Sodium Chloride

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