Impact of sulphate source on the hydration of ternary pastes of Portland cement, calcium aluminate cement and calcium sulphate

Qoku, Elsa; Bier, Thomas; Schmidt, Gert

doi:10.1016/j.cemconcomp.2022.104502

Cited by 16 publications

(7 citation statements)

References 53 publications

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“…In order to clarify the relationship between the cementitious activity and structure of magnesium slag, solid-state 29 Si NMR analysis was performed to further study the [SiO 4 ] polymerization degree of magnesium slag in comparison with granulated blast furnace slag [51]. Figure 3 shows the NMR spectra of magnesium slag and granulated blast furnace slag.…”

Section: [Sio 4 ] Polymerization Degree Of Magnesium Slag and Granula...mentioning

confidence: 99%

Structural Characteristics and Cementitious Behavior of Magnesium Slag in Comparison with Granulated Blast Furnace Slag

Lu,

Zhao,

Zhang

et al. 2024

Materials

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Magnesium slag is a type of industrial solid waste produced during the production of magnesium metal. In order to gain a deeper understanding of the structure of magnesium slag, the composition and microstructure of magnesium slag were investigated by using characterization methods such as X-ray fluorescence, particle size analysis, X-ray diffraction, Fourier transform infrared spectroscopy and scanning electron microscopy. In addition, the state of Si occurrence in magnesium slag was analyzed using a solid-state nuclear magnetic resonance technique in comparison with granulated blast furnace slag. An inductively coupled plasma-optical emission spectrometer and scanning electron microscope with energy dispersive X-ray spectroscopy were used to characterize their cementitious behavior. The results show that the chemical composition of magnesium slag mainly includes 54.71% CaO, 28.66% SiO2 and 11.82% MgO, and the content of Al2O3 is much lower than that of granulated blast furnace slag. Compared to granulated blast furnace slag, magnesium slag has a larger relative bridging oxygen number and higher [SiO4] polymerization degree. The cementitious activity of magnesium slag is lower compared to that of granulated blast furnace slag, but it can replace part of the cement to obtain higher compressive strength. Maximum compressive strength can be obtained when the amount of magnesium slag replacing cement is 20%, where the 28-day compressive strength can be up to 45.48 MPa. This work provides a relatively comprehensive analysis of the structural characteristics and cementitious behavior of magnesium slag, which is conducive to the promotion of magnesium slag utilization.

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Section: [Sio 4 ] Polymerization Degree Of Magnesium Slag and Granula...mentioning

confidence: 99%

Structural Characteristics and Cementitious Behavior of Magnesium Slag in Comparison with Granulated Blast Furnace Slag

Lu,

Zhao,

Zhang

et al. 2024

Materials

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“…The first peak happens in the initial minutes of water addition and is attributed to the rapid dissolution of phases during the wetting process [12]. The second, less intense and broader peak, is attributed to the precipitation of ettringite and AH 3 [10], taking place 2.5 h after water contact and signifying the acceleration period. A comparison of Figure 8a,b shows that moving from composition C1 to compositions C2 and C3, accompanied by an increase in CAC content, leads to two different hydration mechanisms, evidenced by an additional peak in the heat of hydration curves.…”

Section: Hydration Kineticsmentioning

confidence: 99%

“…Conversely, CAC-dominated systems, recognized for their expanding and rapid-drying properties, have been developed. Both binary systems of PC-CAC and ternary systems combined with various calcium sulfate sources (such as anhydrite, gypsum, or hemihydrate) have been thoroughly investigated concerning mechanical properties, hydration processes, and microstructural development [2][3][4][5][6][7][8][9][10]. Mixtures based on PC or CAC, with or without C Ŝ, exhibit distinct hydration kinetics compared to pure PC or CAC [11].…”

Section: Introduction 1ternary Binder Systemsmentioning

confidence: 99%

Multi-Response Optimization on Hydrated Calcium Aluminate Rich Ternary Binders Using Taguchi Design of Experiments and Principal Component Analysis

Myftarago,

Bier,

Qoku

et al. 2023

Buildings

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This study investigates the influence of various factors on the performance of ternary binders, utilizing statistical approaches. The research focuses on the influence of varying compositions of Portland Cement-Calcium Aluminate Cement-Calcium Sulphate (PC-CAC-CŜ), types and amounts of mineral powders, and chemical admixtures in ternary binders. Using the Taguchi design, the study required a limited number of experimental trials, utilizing a standard orthogonal array of seven factors across three levels. These factors encompassed binder composition (C1-C2-C3), mineral powder types (limestone, quartz, slag), replacement ratio (0%, 25%, 50%), retarder (0%, 0.1%, 0.2%), superplasticizer, viscosity modifying agent (stabilizer) and accelerator (0%, 0.05%, 0.1%). Measurements on hydration kinetics, dimensional stability, compressive strength, and microstructural analyses like X-ray diffraction were conducted. Principal Component Analysis (PCA) was employed to interpret the continuous data derived from heat of hydration curves, length change curves and X-ray diffraction (XRD) patterns. Results indicated that retarder quantity and binder type significantly impacted paste workability. Higher powder content led to reduced strength, whereas increased accelerator improved strength. A strong correlation was observed between accelerator content and the dimensional stability. The primary hydration product’s formation was predominantly influenced by the PC-CAC-CŜ ratio, accelerator, and cement substitutions.

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“…Previous studies have investigated binary and ternary systems mixed with different calcium sulphate sources, such as anhydrite, gypsum, or hemihydrate, in terms of mechanical properties, hydration process, and microstructure development [6][7][8][9][10][11][12]. The addition of organic fillers and chemical admixtures can also be used to achieve specific technological properties [13].…”

Section: Introductionmentioning

confidence: 99%

“…The same trend is observed in the second plot, Figure11, representing the setting time, except that -HH decreases the initial setting time. As it has been previously found[12], from the types of sulphates used in the mixture, anhydrite and gypsum are commonly used sulphates and can act as a setting regulator, while -HH can be used to accelerate the setting time. Results shown in Figure12indicate that moving from S2 to S4 and then to S6 results in an increase in strength.…”

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confidence: 99%

A multi‐DOE approach to investigate the effect of different factors on the properties of ternary binders

Qorllari,

Bier

2023

ce papers

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The Design of Experiment (DOE) is a widely recognized approach to designing and analyzing experiments. It is a statistical method utilized to simultaneously examine the impact of multiple factors on the results. In this study, two different DOE methods, including mixture and factorial design were employed to evaluate the influence of various factors on the performance of ternary binders. To assess the effect of each component such as Portland cement (PC), calcium aluminate cement (CAC) and sulphate (CŜHx) on the workability and strength of ternary binders, mixture design was utilized. A two‐stage factorial design was implemented to investigate the impact of various factors on the fresh and hard properties of ternary binders. In the first stage the influence of composition, supplementary cementitious material (SCM) and cement replacement ratio were examined. In the second stage the impact of composition, CAC and CŜHx type were analyzed. Principal Component Analysis was also employed to analyse the continuous data obtained from the XRD patterns. The study results indicated that increased CAC and CŜHx content in the mixture enhances the workability of the pastes. High compressive strengths were found to be a result of increased cement content in the mixture and low SCM substitution.

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Impact of sulphate source on the hydration of ternary pastes of Portland cement, calcium aluminate cement and calcium sulphate

Cited by 16 publications

References 53 publications

Structural Characteristics and Cementitious Behavior of Magnesium Slag in Comparison with Granulated Blast Furnace Slag

Structural Characteristics and Cementitious Behavior of Magnesium Slag in Comparison with Granulated Blast Furnace Slag

Multi-Response Optimization on Hydrated Calcium Aluminate Rich Ternary Binders Using Taguchi Design of Experiments and Principal Component Analysis

A multi‐DOE approach to investigate the effect of different factors on the properties of ternary binders

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