Influence de la temperature de recuit sur la cinetique de l'hydratation du silicate tricalcique

Fierens, Paul; Kabuema, Y.; Tirlocq, J.

doi:10.1016/0008-8846(82)90060-6

Cited by 9 publications

(6 citation statements)

References 8 publications

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“…The presence and the type of defects are driven by the type and amount of mineral trace elements (Al 2 O 3 , MgO, MnO, TiO 2 , etc. ), [25][26][27] by the quenching conditions 28 and by possible subsequent thermal posttreatments. 23,29 In spite of the absence of investigations on dissolution in all of these studies, many of these as well as others 30,31 mentioned the influence of the defects on the hydration rate.…”

Section: March 2016 Alite Surface Dissolution Modelmentioning

confidence: 99%

Analytical Model for the Alite (C₃S) Dissolution Topography

Nicoleau¹,

Bertolim²

2015

J. Am. Ceram. Soc.

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The surface topography that develops during the dissolution of alite (or C 3 S) has never been considered as an important aspect of the hydration of portland cement. Like many other minerals, alite dissolution results in the formation of etch pits. In this study, a simple model with a handful of parameters is proposed to explore the kinetic consequences of pitting on the dissolution of alite. The first consequence is an accelerating period during which the reactive surface, that is, the pit, expands. This new feature, to the authors' opinion never reported previously for alite, is supported by experimental data. The mechanisms leading to the activation of the initial dissolution centers and to the growth of pits could be hindered by some inhibitory species such as aluminum ions or organic molecules. The model indicates that only a few assumptions about the formation of pits in the presence of these species are necessary to introduce an initial period of low dissolution prior to the accelerating phase. Such a low early reactivity is similar to the so-called dormant period observed during portland cement hydration. The implications of this new model in cement hydration could go beyond this article and shed light on still unresolved fundamental questions on hydration behavior.

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Section: March 2016 Alite Surface Dissolution Modelmentioning

confidence: 99%

Analytical Model for the Alite (C₃S) Dissolution Topography

Nicoleau¹,

Bertolim²

2015

J. Am. Ceram. Soc.

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“…Fierens et al . reported modifications in the thermoluminescence spectra of C 3 S after thermal treatment between 800°C and 1600°C and an extension of the induction period, which they related to a reduction in defect density.…”

Section: Introductionmentioning

confidence: 99%

Impact of Annealing on the Early Hydration of Tricalcium Silicate

2013

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It was recently proposed that the induction period observed during the hydration of tricalcium silicate could be explained by the build-up of ions in solution. Due to the importance of defects in this mechanism, this work describes the effect of different annealing effects on the defect structure and hydration behavior of C 3 S. The impact of annealing on the crystal structure was checked by X-ray diffraction and the defect structure studied by transmission electron microscopy. The hydration kinetics were followed by isothermal calorimetry of pastes. Scanning electron microscopy was used to look at the microstructure formation. It was observed that grinding created a highly deformed layer on the surface of the grains, which disappeared after annealing. The defect structure was closely related to the length of the induction period observed in pastes by calorimetry. There was no observable effect on the morphology of C-S-H during hydration, but the number of calcium hydroxide nuclei was less in pastes from annealed material.

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“…For hydration of pure cement minerals such as tricalcium silicate (C 3 S), the standard JMAK nucleation and growth model has been used widely in this way, e.g., Refs. , and more recently a variation known as the boundary nucleation and growth model has also been used . The resulting activation energy is an average value for the time period covered by the fits.…”

Section: Introductionmentioning

confidence: 99%

The Instantaneous Apparent Activation Energy of Cement Hydration Measured Using a Novel Calorimetry‐Based Method

Thomas

2012

J. Am. Ceram. Soc.

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A new calorimetry-based method for calculating the activation energy of cement hydration is described. The method requires a scanning calorimeter that can change the sample temperature relatively quickly and has a stable baseline, but the technique is straightforward to perform. Activation energy values can be calculated at multiple hydration times from a single specimen, allowing any changes with time to be assessed. With this method, the measured activation energy at a given time does not depend on the previous microstructural development, as is the case with traditional methods of calculating the activation energy from parallel specimens hydrated isothermally at different temperatures. For tricalcium silicate (C 3 S) hydrated in pure water or in a calcium chloride solution, the activation energy remains statistically constant from the earliest times until the degree of hydration exceeds 0.65, with an overall average value of (51.1 ± 1.8) kJ/mol. For cement hydration, the activation energy is also constant until well past the main hydration peak, with slightly lower average values. These results suggest that the rate-controlling step in the hydration process does not change during the early hydration period (the first few days after mixing), as different reaction steps tend to have different activation energies.

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Influence de la temperature de recuit sur la cinetique de l'hydratation du silicate tricalcique

Cited by 9 publications

References 8 publications

Analytical Model for the Alite (C₃S) Dissolution Topography

Analytical Model for the Alite (C₃S) Dissolution Topography

Impact of Annealing on the Early Hydration of Tricalcium Silicate

The Instantaneous Apparent Activation Energy of Cement Hydration Measured Using a Novel Calorimetry‐Based Method

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Influence de la temperature de recuit sur la cinetique de l'hydratation du silicate tricalcique

Cited by 9 publications

References 8 publications

Analytical Model for the Alite (C3S) Dissolution Topography

Analytical Model for the Alite (C3S) Dissolution Topography

Impact of Annealing on the Early Hydration of Tricalcium Silicate

The Instantaneous Apparent Activation Energy of Cement Hydration Measured Using a Novel Calorimetry‐Based Method

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Product

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Analytical Model for the Alite (C₃S) Dissolution Topography

Analytical Model for the Alite (C₃S) Dissolution Topography