Mechanism of C3S dissolution and problem of the congruency in the very initial period and later on

Barret, P.; Ménétrier, D.; Bertrandie, D.

doi:10.1016/0008-8846(83)90064-9

Cited by 65 publications

(27 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The percentage changes in volume shown in Table 3 are higher than one would expect from the literature based on bulk analysis [3,21,56]. It should be noted that all of the particles investigated were quite small (< 5 μm diameter) and the reaction depths of the particles were similar.…”

Section: Discussionmentioning

confidence: 63%

See 1 more Smart Citation

Direct measurements of 3d structure, chemistry and mass density during the induction period of C3s hydration

Aboustait

Kim

et al. 2016

Cement and Concrete Research

View full text Add to dashboard Cite

The reasons for the start and end of the induction period of cement hydration remain topic of controversy. One long-standing hypothesis is that a thin metastable hydrate forming on the surface of cement grains significantly reduces the particle dissolution rate; the eventual disappearance of this layer re-establishes higher dissolution rates at the beginning of the acceleration period. However, the importance, or even the existence, of this metastable layer has been questioned because it cannot be directly detected in most experiments. In this work, a combined analysis using nano-tomography and nano-X-ray fluorescence makes the direct imaging of early hydration products possible. These novel X-ray imaging techniques provide quantitative measurements of 3D structure, chemical composition, and mass density of the hydration products during the induction period. This work does not observe a low density product on the surface of the particle, but does provide insights into the formation of etch pits and the subsequent hydration products that fill them.

show abstract

Section: Discussionmentioning

confidence: 63%

“…Based on previous publications, these ratios suggest C-S-H [8,19,21,26,27,52]. One possible explanation is the preferential leaching of Ca ions, but others have shown that C3S dissolution is congruent [3,53]. To determine the stoichiometry for these regions of C-S-H, the amount of bonded H 2 O needs be determined.…”

Section: Resultsmentioning

confidence: 99%

Direct measurements of 3d structure, chemistry and mass density during the induction period of C3s hydration

Aboustait

Kim

et al. 2016

Cement and Concrete Research

View full text Add to dashboard Cite

show abstract

“…Despite those efforts and the large collection of new data generated, no conclusive assessment could emerge to discriminate the divergent points of view, debated now for several decades in the cement chemistry community, on what happens within the first 10-15 minutes upon mixing of cement and water and what causes the induction/dormant period. Whether a protective membrane [5,6] forms or not, whether cement surface undergoes a superficial protonation as originally proposed by Barret [7] or a superficial hydration as more recently proposed by Gartner [8] or whether precipitation/growth of hydrates governs completely the overall hydration kinetics [2,9,10] remains unanswered with certitude, although all various hypotheses are generally supported with extensive series of data or thermodynamic considerations.…”

Section: Introductionmentioning

confidence: 96%

Morpho-topological investigation of the mechanisms and kinetic regimes of alite dissolution

Juilland¹,

Gallucci²

2015

Cement and Concrete Research

View full text Add to dashboard Cite

“…Also additional mechanisms can occur such as adsorption on the surface and protonation of the surface that are common phenomena in minerals [4][5][6]. Barret described the dissolution process of C 3 S at the nanoscale as an interfacial reaction of C 3 S with water molecules and called it superficial hydroxylation [7,8]: dissolution is a repeating sequence of interfacial steps as it is the case for some other minerals; first an irreversible attack of superficial sites of C 3 S by water molecules, then a reversible step resulting in the passage of the formed species from C 3 S surface into solution.…”

Section: Introductionmentioning

confidence: 99%

Measurement and simulation of the dissolution rate at room temperature in conditions close to a cement paste: from gypsum to tricalcium silicate

Damidot

Bellmann

Sovoidnich

et al. 2012

Journal of Sustainable Cement-Based Materials

View full text Add to dashboard Cite

Measurement and simulation of the dissolution rate at room temperature in conditions close to a cement paste: from gypsum to tricalcium silicateThe measurement of the dissolution rate was performed in conditions close to a cement paste; thanks to a specifically designed experimental device that was calibrated with gypsum. For tricalcium silicate (C 3 S) dissolved in several electrolytes at room temperature, it appeared that the average dissolution rate of C 3 S was modified with some relatively small concentrations of electrolytes. The strongest effects corresponded to the inhibiting effects of hydroxide and calcium ions that were taken into account to simulate the dissolution rate of C 3 S using Lasaga's equation. Compared to dissolution experiments in saturated portlandite solution during which hardly any dissolution of C 3 S occurred for several hours, the reported simulations tend to be an indirect proof in favor of the existence of an additional mechanism that restricted further the dissolution of C 3 S. This mechanism is expected to be related to the very rapid formation of thin layer composed of intermediate phase around C 3 S grains.

show abstract

Mechanism of C3S dissolution and problem of the congruency in the very initial period and later on

Cited by 65 publications

References 9 publications

Direct measurements of 3d structure, chemistry and mass density during the induction period of C3s hydration

Direct measurements of 3d structure, chemistry and mass density during the induction period of C3s hydration

Morpho-topological investigation of the mechanisms and kinetic regimes of alite dissolution

Measurement and simulation of the dissolution rate at room temperature in conditions close to a cement paste: from gypsum to tricalcium silicate

Contact Info

Product

Resources

About