Investigating the hydration of deflocculated calcium aluminate cement-based binder with catalyst waste

Antonovič, Valentin; Aleknevičius, Marius; Kerienė, Jadvyga; Pundienė, Ina; Stonys, Rimvydas

doi:10.1007/s10973-012-2240-7

Cited by 20 publications

(11 citation statements)

References 23 publications

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“…Subsequently, the heat evolution was monitored for the mixtures composed of 25 % fly ash and 75 % cement CEM I samples. The calorimetric measurements appeared again as a convenient, rapid method of the hydraulic activity assessment, used in case of mineral additives and different modifying agents for a couple of years [15][16][17][18][19][20].…”

Section: Methodsmentioning

confidence: 99%

Calorimetry in testing waste materials from the brown coal combustion

Nocuń-Wczelik

Łagosz

Kowalski

et al. 2014

J Therm Anal Calorim

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The calorimetric measurements were applied in testing the wastes collected from different furnaces in electric power plants as materials to be used in civil engineering. The fly ash materials were collected from two power stations based on different brown coal deposits and working with conventional and fluidized bed installation. The reactivity of high calcium fly ash from sub-bituminous coal combustion has been proved in calorimetric, conductometric, chemical shrinkage, and rheological measurements before their practical implementation on larger scale. Highly soluble components of fly ash contribute to the hydration products and structure formation, followed by setting and hardening of fly ash-cement mixture. These results have been the base of research project aimed in the innovative solutions dealing with the management of deposits of wastes generated as a result of coal combustion. The standardization and potential use on larger scale of these materials, necessary from the environmental point of view, seems to be the question of nearest future.

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Section: Methodsmentioning

confidence: 99%

Calorimetry in testing waste materials from the brown coal combustion

Nocuń-Wczelik

Łagosz

Kowalski

et al. 2014

J Therm Anal Calorim

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“…The kinetics and mechanism of hydration in various cementitious systems can be investigated by calorimetry [1][2][3][4]. The heat evolution curve (dQ/dt = f(t)) reflects the fluctuations of the overall rate of reactions occurring in the hydrating system and accompanying cement setting and hardening.…”

Section: Introductionmentioning

confidence: 99%

Application of calorimetry as a main tool in evaluation of the effect of carbonate additives on cement hydration

Nocuń-Wczelik

Trybalska

Żugaj

2013

J Therm Anal Calorim

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Calorimetry was applied to follow the hydration in the Portland cement-dolomite-limestone mixtures.In the experiments the limestone additive of various fineness (standard component of various common cements), as well as the dolomite additive (not a standard component) were used. The rate of hydration versus time for common cements reflects the proper setting and early hardening during the first days after mixing with water (two or three peaks and the induction period between them). The aim of measurements presented in this work was to show the course of heat evolution curve and the heat evolved values, equivalent to the acceleration/retardation of hydration, in case of the pastes produced from Portland cement and the carbonate additives mixed in variable proportions, as well as to verify the results by other methods. The rate of heat evolution accompanying cement paste hydration, total heat evolved, conductivity of hydrating suspension and rheological (flow) properties versus time are modified by the fine grained carbonate additives. This is due to the hypothetical nucleating effect of limestone and dolomite.

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“…The phases α-Al 2 O 3 and C 12 A 7 were also identified and existed in small amounts in CAC. Other properties of G70: specific surface area (Blaine fineness) 400–450 m 2 /g, pH 11–11.5, and bulk density 1100 kg/m 3 [ 29 ].…”

Section: Materials and Research Methodsmentioning

confidence: 99%

Investigations of the Influence of Nano-Admixtures on Early Hydration and Selected Properties of Calcium Aluminate Cement Paste

et al. 2022

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In this work, the hydration of calcium aluminate cement (CAC, Al2O3 ≥ 70%) paste with nano admixtures (0, 0.05%, 0.1% and 0.2%) of nano-silica (NS) and carbon nano-cones (NC) when W/CAC = 0.35 was investigated. The methods of calorimetry, thermal analysis, X-ray diffraction (XRD), IR spectroscopy, and scanning electron microscopy (SEM) were used. In addition, the physical and mechanical properties of hardened cement pastes were determined after 3 days of hardening. NS was found to shorten the induction period of CAC hydration and accelerate the time of the secondary heat release effect, especially in the specimens with the highest NS content. The incorporation of NC (up to 0.2%) slows down the hydration process. After 3 days of hydration, the formation of hydration products, such as C2AH8, CAH10, C3AH6 and AH3 hydrates, was observed in CAC pastes, however, the quantitative compositions were different depending on the kind of nano admixture and its amount. SEM results obtained show differences in the effect of NS and NC on the formation of the structure of cement paste during its hardening. Significant changes in CAC paste microstructure were caused by the addition of NS and NC admixtures. Compressive strength was found to increase with the increase of NS and the optimal NS content was found to be 0.10 wt.%. The modification of the cement paste with an NS admixture results in a higher amount of hydrates, lower total porosity, and a higher amount of the smallest pores in the microstructure of the sample. NS and NC influence the hydration behaviour of CAC in different ways, which causes characteristic changes in the microstructure and properties of hardened samples.

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Investigating the hydration of deflocculated calcium aluminate cement-based binder with catalyst waste

Cited by 20 publications

References 23 publications

Calorimetry in testing waste materials from the brown coal combustion

Calorimetry in testing waste materials from the brown coal combustion

Application of calorimetry as a main tool in evaluation of the effect of carbonate additives on cement hydration

Investigations of the Influence of Nano-Admixtures on Early Hydration and Selected Properties of Calcium Aluminate Cement Paste

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