Luminescence et hydration du silicate tricalcique

Fierens, Paul; Tirlocq, J.; Verhaegen, J.P.

doi:10.1016/0008-8846(73)90093-8

Cited by 20 publications

(8 citation statements)

References 4 publications

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“…The complex relations between content of substituent ions, polymorphism, defects and reactivity were recently studied again [19,30,31]. As a result the findings of Fierens and Verhaegen [28,29] (relation between defect concentration and the hydration behavior of alite) remains open for discussion.…”

Section: Reactivity Of Alitementioning

confidence: 98%

“…As a result, it is difficult or nearly impossible to handle these parameters independently. Back in the 1970's Fierens and Verhaegen [28,29] found that the influence of substituent ions on the reactivity of C 3 S was due to the presence of defects, which could be studied by the irradiation induced thermoluminescence (TL). The complex relations between content of substituent ions, polymorphism, defects and reactivity were recently studied again [19,30,31].…”

Section: Reactivity Of Alitementioning

confidence: 99%

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Research review of cement clinker chemistry

Ludwig

Zhang

2015

Cement and Concrete Research

230

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Section: Reactivity Of Alitementioning

confidence: 98%

Section: Reactivity Of Alitementioning

confidence: 99%

Research review of cement clinker chemistry

Ludwig

Zhang

2015

Cement and Concrete Research

230

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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. ), by the quenching conditions and by possible subsequent thermal posttreatments . In spite of the absence of investigations on dissolution in all of these studies, many of these as well as others mentioned the influence of the defects on the hydration rate.…”

Section: Etch Pit Formation During the Dissolution Of Alitementioning

confidence: 99%

“…Studies on the role of structural defects have been the subject of many publications, especially by researchers at the University of Mons in the 1960s and 1970s. Among others, Fierens 23,24 showed by thermoluminescence and exo-electron spectroscopy that alite contains various defects of different energies. Without going into detail, the defects are dislocations, vacancies, substitutional atoms and interstitial atoms.…”

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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“…Some deviations of the simulations from the experimental results are expected because of the assumptions used in the model, and the errors from the experimental results. As there are many other factors which affect the kinetics of the system from the shape of the particles, agglomeration, morphology, impurities of C 3 S to thermal treatment of C 3 S production, it is assumed that these effects would be captured in the calibration making prediction possible without considering those effects.…”

Section: Discussionmentioning

confidence: 99%

Modeling the effect of fineness and filler in early‐age hydration of tricalcium silicate

et al. 2016

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Alite (impure C3S) being the major and most reactive phase in ordinary portland cement has been studied extensively. This paper focuses on the mathematical modeling of new hypothesis developed, densified volumetric growth, applied to the main hydration peak in alite hydration. This hypothesis assumes a time and particle size‐dependent growth rate and densification rate of C–S–H controlled by its internal surface area. To test this hypothesis, a new microstructural modeling platform (Cementitious Reactions Simulator) has been developed. The model was used to calibrate and predict the isothermal calorimetric results from the literature and two sets of original experimental results with alite replaced with different replacement fractions of quartz, fly ash, and slag of different fineness. The model is able to capture and predict the effect of fineness and fillers without the need of varying the parameters for the particular set of simulations. The values of the parameters of simulation reflect the current experimental evidence from the literature and thus provide validation of the hypothesis which suggests that the main hydration period including deceleration period in the alite hydration is induced by the densification and reducing outer growth rate of C–S–H.

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Luminescence et hydration du silicate tricalcique

Cited by 20 publications

References 4 publications

Research review of cement clinker chemistry

Research review of cement clinker chemistry

Analytical Model for the Alite (C₃S) Dissolution Topography

Modeling the effect of fineness and filler in early‐age hydration of tricalcium silicate

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Luminescence et hydration du silicate tricalcique

Cited by 20 publications

References 4 publications

Research review of cement clinker chemistry

Research review of cement clinker chemistry

Analytical Model for the Alite (C3S) Dissolution Topography

Modeling the effect of fineness and filler in early‐age hydration of tricalcium silicate

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Product

Resources

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Analytical Model for the Alite (C₃S) Dissolution Topography