Triaxial strength behavior of carbide sludge (CS)–ground-granulated blastfurnace slag (GGBS)-treated clay slurry

Li, Wentao; Yi, Yaolin; Puppala, Anand J.

doi:10.1007/s11440-022-01601-w

Cited by 24 publications

(2 citation statements)

References 47 publications

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“…Thus, alternative low-carbon binders are warranted to enhance the sustainability of the stabilization of dredged sediment. Alkali-activated granulated blast-furnace slag (GGBS) has been identified as a viable alternative to OPC for the stabilization of dredged sediments [5,6]. This is because alkali-activated GGBS binders exhibit lower energy consumption (0.2 GJ per 1 t of GGBS) and CO 2 emission (0.07 t per 1 t of GGBS) compared to OPC with the energy consumption and CO 2 emission of 5.5 GJ and 0.95 t, respectively [7].…”

Section: Introductionmentioning

confidence: 99%

Towards Sustainable Stabilization: Sodium Carbonate Tunning the Strength Development of Dredged Sediments Stabilized with Alkali- activated Ground Granulated Blast-furnace Slag

Ma,

Choi,

Zhang

2023

Preprint

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Chemical stabilization of dredged sediments presents a promising solution for the reutilization of dredged waste in engineering fills. To promote decarbonization efforts, the use of low-carbon binders, such as alkali-activated ground granulated blast furnace slag (GGBS), emerges as a viable alternative to ordinary Portland cement. Dredged sediments commonly exhibit high water contents (e.g., exceeding 100%), which can compromise the efficacy of alkali-activated GGBS binders in enhancing the strength of these sediments. It has been demonstrated that sodium carbonate (Na2CO3) can potentially accelerate the strength development of alkali-activated GGBS-stabilized sediments. However, the mechanisms on how Na2CO3 influences the strength development of such stabilized sediments remain unclear. This knowledge gap impedes the establishment of a robust scientific foundation for optimizing the mixing design of alkali-activated GGBS binders to effectively stabilize dredged sediments. This study investigates the effects of varying Na2CO3 contents on the strength development of alkali-activated GGBS-stabilized sediments characterized by high water contents. To reveal the mechanisms underlying the effects of Na2CO3 on the strength development of GGBS-stabilized sediments, the reaction products and the pore structures of stabilized sediments are examined by using X-ray diffraction, thermogravimetric analysis, scanning electron microscopy, and mercury intrusion porosimetry techniques. The optimal content of Na2CO3 for attaining the highest 28-day compressive strength of stabilized sediments is determined to be 0.2% by weight. Below this optimal content, the strength of stabilized sediments increases with Na2CO3 content. However, surpassing this optimal content, the increase in Na2CO3 content results in a decrease in the strength of stabilized sediments. The addition of Na2CO3 additive into alkali-activated GGBS-stabilized sediments induces changes in the interactions between clay minerals and reaction products, thereby altering the pore size distribution within the sediments. These modifications in the pore size distribution results in the observed impacts of different Na2CO3 contents on the strength development of stabilized sediments. The revealed mechanisms can provide a scientific basis to optimize the alkali-activated GGBS binders used for the sustainable stabilization of dredged sediments.

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Section: Introductionmentioning

confidence: 99%

Towards Sustainable Stabilization: Sodium Carbonate Tunning the Strength Development of Dredged Sediments Stabilized with Alkali- activated Ground Granulated Blast-furnace Slag

Ma,

Choi,

Zhang

2023

Preprint

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“…As the industry has rapidly developed, the emissions in terms of gas, paints, toxic liquid, etc., have caused a significant impact on the living environment [1]. As the result, heavy metals such as copper (Cu), zinc (Zn), etc can be found in the soil and groundwater [2][3][4][5][6][7]. These heavy metals are highly plausibly to eventually enter the communities, threatening humans [8,9].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Impact on Hydro-Mechanical Properties for Cement Stabilized Heavy Metal Contaminated Soil under Different Salinity

et al. 2022

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The purpose of this study is to investigate the hydro-mechanical properties of heavy metal (Cu, Zn) contaminated soil stabilized using cement treatment situated under different salinity. Conventional oedometers with cylindrical samples dimensioned ⌀61.8 × 20 mm were used to conduct the tests. Two cement contents (10%, 20% by mass of cement to the mass of dry soil) and three salinity levels (0.5M, 1M, 1.5M) were used as comparison variables. The compression results demonstrate that the coupled condition in terms of mechanical and chemical will have different behavior on the soil specimen, as Cc (compression index) changes with different metal fractions. The hydraulic conductivity (k) results show that a higher metal fraction will compromise the k. The possible development of water and metal ions is proposed that when a different type and fraction of metal ions are present, the hydration reaction can be suppressed depending on whether the metal ion prioritizes the reaction with either cement or saline solution. It was found that Cu ions prioritize their reaction to a saline solution while Zn ions target the Ca(OH)2 that is available from cement. However, more studies should be carried out to confirm this point.

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A Study of the Anisotropy of Improved Clay Using the Nordic Dry Deep Mixing Method

Hov,

Paniagua,

Karlsrud

2024

Lecture Notes in Civil Engineering

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Triaxial strength behavior of carbide sludge (CS)–ground-granulated blastfurnace slag (GGBS)-treated clay slurry

Cited by 24 publications

References 47 publications

Towards Sustainable Stabilization: Sodium Carbonate Tunning the Strength Development of Dredged Sediments Stabilized with Alkali- activated Ground Granulated Blast-furnace Slag

Towards Sustainable Stabilization: Sodium Carbonate Tunning the Strength Development of Dredged Sediments Stabilized with Alkali- activated Ground Granulated Blast-furnace Slag

Investigation of Impact on Hydro-Mechanical Properties for Cement Stabilized Heavy Metal Contaminated Soil under Different Salinity

A Study of the Anisotropy of Improved Clay Using the Nordic Dry Deep Mixing Method

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