Induction period of hydration of tricalcium silicate

Fierens, Paul; Verhaegen, J.P.

doi:10.1016/0008-8846(76)90126-5

Cited by 21 publications

(34 citation statements)

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“…Later, as the solution becomes increasingly saturated, the driving force for dissolution is evidently too low to sustain the unwinding of the etch pits, so dissolution may switch to a slower but more uniform step flow mechanism. Recent experimental work supports these ideas [8,13-17]. The uneven reaction on alite grains has been reported using scanning electron microscopy (SEM) and transmission electron microscopy (TEM) after two hours of hydration [8].…”

Section: Introductionmentioning

confidence: 85%

“…These defects on some anhydrous C 3 S particles have been imaged using TEM [16]. The impact of the density of defects on the induction period has also been confirmed by studying the same C 3 S material before and after annealing using calorimetry [16,17]. However, calorimetry experiments measure bulk heat release and do not provide insights into the details of the hydration product formation and dissolution process [18-21].…”

Section: Introductionmentioning

confidence: 99%

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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

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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.

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Section: Introductionmentioning

confidence: 85%

Section: Introductionmentioning

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

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“…calcium aluminate hydrate, ettringite and calcium sulpho aluminate etc. Earlier reviews on cement hydration have concluded that after the formation of a metastable C-S-H layer on C 3 S surfaces, a stable form of C-S-H is formed which nucleate the hydration process [28][29][30][31][32]. Garrault and Nonat [33] use the slow dissolution hypothesis and interpreted a decrease in silicate concentrations in the beginning of hydration, as a result of C-S-H nucleation.…”

Section: Introductionmentioning

confidence: 99%

Studies on early stage hydration of tricalcium silicate incorporating silica nanoparticles: Part II

Singh

Bhattacharyya

Shah

et al. 2016

Construction and Building Materials

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h i g h l i g h t sSNPs shows its maximum nucleation effect at 8 h when the rate of product formation is high than the control. Maximum pozzolanic effect of SNPs observed at 24 h when the quantity of CH was lower than the control. $25% addition C-S-H formed in the presence of SNPs at 24 h. More polymerized and well ordered crystalline C-S-H is formed in presence of SNPs. SNPs formed more compact and dense microstructure at 24 h which is responsible for the higher early age mechanical strength. a b s t r a c tThe beneficial role of silica nano-particles (SNPs) during the early stage hydration of tricalcium silicate (C 3 S) has been investigated. ICP results show that SNPs significantly accelerate the hydration rate as well as the growth of hydrated products, by providing additional nucleating sites. XRD results also show a dominant nucleation effect of SNPs up to 10 h. While, at later stage i.e. from 15 to 24 h, the pozzolanic effect of SNPs was dominant. Further, TGA results reveal that, in SNPs incorporated samples, quantity of CH is higher ($61% at 8 h) up to 10 h, and lower ($32% at 24 h) from 15 to 24 h than the control, showing the nucleation and pozzolanic effect of SNPs respectively. FTIR and XRD results further reveal an accelerated formation of crystalline C-S-H (jennite and tobermorite) with SNPs. All these results i.e.

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“…Maycock et ai, [93] suggested that solid-state diffusion is the rate-controlling step. Thermo-luminescence studies [83,[134][135][136][137][138] have shown that the disappearance of a specific peak can be correlated with the end of stage II. Fierens and Verhaegen were able to show that the disappearing peak corresponds to active defects which were highly nucleophilic.…”

Section: Many Of These Ideas Have Been Brought Together [5117133j Imentioning

confidence: 99%

The Developing Microstructure in Portland Cement

Jennings

1983

Advances in Cement Technology

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Induction period of hydration of tricalcium silicate

Cited by 21 publications

References 0 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

Studies on early stage hydration of tricalcium silicate incorporating silica nanoparticles: Part II

The Developing Microstructure in Portland Cement

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