Rapid synthesis of hydrotalcite with high antacid activity

Parashar, Priyanka; Sharma, Vivek; Agarwal, D. D.; Richhariya, Neelam

doi:10.1016/j.matlet.2011.12.115

Cited by 42 publications

(11 citation statements)

References 13 publications

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“…However, this minor hydration product was not identified in the XRD result, probably due to its small content. The decomposition of the hydrotalcite-like phases induced a tiny shoulder at ~200°C and the weight loss between 330°C and 400°C, as reported by other researchers [38,48,49]. For pastes of high CaO content (i.e.…”

Section: Thermogravimetric Analysis (Tga)supporting

confidence: 67%

Mechanical and hydration properties of ground granulated blastfurnace slag pastes activated with MgO–CaO mixtures

Jin

Al‐Tabbaa

et al. 2014

Construction and Building Materials

102

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Since alkali-activated slag using conventional activators suffers from economical and technical problems, other alternative activators should be explored. This paper reports the results of an investigation into the activation of ground granulated blastfurnace slag by using 10% (by weight) reactive MgO, CaO and their mixtures with various ratios. The mechanical and hydration properties of pastes were examined up to 90 days. It was found that the strength of slag pastes activated with MgO-CaO mixtures decreased with the increasing ratio of MgO to CaO in the early age while a much steeper strength gain was observed in pastes with MgO/CaO higher than 19/1 after 28 days and longer. The addition of small amount of CaO in MgO can greatly accelerate the hydration of slag in the early age by increasing the pH of pore solution. However, pastes showed small difference in strength development at each period when MgO/CaO was less than 1. The main hydration products, analysed by XRD, TGA and SEM/EDS, were C-S-H and hydrotalcite-like phases. While CaO accelerated the formation of C-S-H in the early age, MgO induced more amount of hydrotalcite-like phases, which notably enhanced the strength of slag pastes with high MgO content after 28 days and longer. Calcite, portlandite and residual MgO were also observed, depending on the MgO/CaO ratio and the hydration time. This work indicated that the replacement of MgO by CaO can make the application of reactive MgO in slag activation more economical.

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Section: Thermogravimetric Analysis (Tga)supporting

confidence: 67%

Mechanical and hydration properties of ground granulated blastfurnace slag pastes activated with MgO–CaO mixtures

Jin

Al‐Tabbaa

et al. 2014

Construction and Building Materials

102

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“…3. The temperature range of 550-800°C is the decomposition range of various carbonate-containing phases including magnesium carbonate, calcite [46] and Ht [47], originating from the raw material and the carbonation due to exposure to the air.…”

Section: Tgamentioning

confidence: 99%

Strength and hydration properties of reactive MgO-activated ground granulated blastfurnace slag paste

Jin

Al‐Tabbaa

2015

Cement and Concrete Composites

260

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a b s t r a c tGround granulated blastfurnace slag (GGBS) is widely used as a partial replacement for Portland cement or as the major component in the alkali-activated cement to give a clinker-free binder. In this study, reactive MgO is investigated as a potentially more practical and greener alternative as a GGBS activator. This paper focuses on of the hydration of GGBS, activated by two commercial reactive MgOs, with contents ranging from 2.5% to 20% up to 90 days. The hydration kinetics and products of MgO-GGBS blends were investigated by selective dissolution, thermogravimetric analysis, X-ray diffraction and scanning electron microscopy techniques. It was found that reactive MgO was more effective than hydrated lime in activating the GGBS based on unconfined compressive strength and the efficiency increased with the reactivity and the content of the MgO. It is hence proposed that reactive MgO has the potential to serve as an effective and economical activator for GGBS.

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“…Since M-S-H was not observed from the XRD and Δm 1 Δm 3 Δm 2 the existence of CaCO3 was proved by the both XRD and SEM, it can be deduced that the mass loss at the temperature range of 400-600°C caused by the decomposition of poorly crystalline CaCO3. The decomposition of the carbonate containing phases occurred between 600-800°C, including calcite (Dweck et al, 2002), gaylussite (Johnson and Robb, 1973) and hydrotalcite (Parashar et al, 2012).…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Microstructure and Strength Development of Sodium Carbonate–Activated Blast Furnace Slags

Aktürk

Nayak

Das

et al. 2019

J. Mater. Civ. Eng.

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This paper presents the study of alkali activated slags where sodium carbonate acts as a primary activator. The slow activation mechanism of sodium carbonate is accelerated by sodium hydroxide and with traces of calcium hydroxide. Strength development and the progress of hydration of the mixes are studied with the phase transformation and development of microstructural features through quantitative techniques such as thermogravimetric analysis and phase-identification techniques such as Fourier transform infrared spectroscopy and X-ray diffraction. Sodium carbonate replacement with sodium hydroxide and the presence of calcium hydroxide in the binder as a replacement of the slag enhances the rate of dissolution of slag leading to a faster strength development. Calcium hydroxide is significantly increased the compressive strength even at early age. On the other hand, sodium hydroxide substitution is effective at later ages of the reaction when used at high dosages (e.g. 40%). Formation of strength giving phases such as hydrotalcite and calcium aluminum silicate hydrate are confirmed with the microstructure analysis and explains the strength development.

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Rapid synthesis of hydrotalcite with high antacid activity

Cited by 42 publications

References 13 publications

Mechanical and hydration properties of ground granulated blastfurnace slag pastes activated with MgO–CaO mixtures

Mechanical and hydration properties of ground granulated blastfurnace slag pastes activated with MgO–CaO mixtures

Strength and hydration properties of reactive MgO-activated ground granulated blastfurnace slag paste

Microstructure and Strength Development of Sodium Carbonate–Activated Blast Furnace Slags

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