The hydration of tricalcium silicate in the presence of colloidal silica

Wu, Zhaoqi; Young, J. F.

doi:10.1007/bf00552262

Cited by 27 publications

(14 citation statements)

References 9 publications

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“…It is also likely that the "barrier layer" that has been suggested to form on the C 3 S surface and is responsible for the beginning of the dormant period [ 12] becomes less effective in the presence of More heat is then generated during the pre-induction stage due to the suggested mechanisms for dissolution and precipitation. This theory is consistent with the previous observations suggesting that the addition of fine particles such as silica fume and calcium carbonate has similar effects in terms of the length of the pre-induction period and the increased rate of heat development [ 9,[25][26][27]]. …”

Section: /31supporting

confidence: 92%

Hydration of tricalcium silicate in the presence of synthetic calcium–silicate–hydrate

et al. 2009

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Hydration of tricalcium silicate in the presence of synthetic calciumsilicate-hydrate Alizadeh, Rouhollah; Raki, Laila; Makar, Jon M.; Beaudoin, James J.; Moudrakovski, Igor http://www.nrc-cnrc.gc.ca/irc H ydra t ion of t ric a lc ium silic a t e in t he pre se nc e of synt he t ic c a lc iumsilic a t e -hydra t e NRCC-51324Alizadeh, R.; Raki, L.; Makar, J.M.; Beaudoin, J.J.; Moudrakovski, I. September 2009A version of this document is published in / Une version de ce document se trouve dans:Journal of Materials Chemistry, v. 19, no. 33, September 9, 2009, pp. 1-19, DOI: 10.1039 /B910216GThe material in this document is covered by the provisions of the Copyright Act, by Canadian laws, policies, regulations and international agreements. Such provisions serve to identify the information source and, in specific instances, to prohibit reproduction of materials without written permission. For more information visit http://laws.justice.gc.ca/en/showtdm/cs/C-42Les renseignements dans ce document sont protégés par la Loi sur le droit d'auteur, par les lois, les politiques et les règlements du Canada et des accords internationaux. Ces dispositions permettent d'identifier la source de l'information et, dans certains cas, d'interdire la copie de documents sans permission écrite. Pour obtenir de plus amples renseignements : http://lois.justice.gc.ca/fr/showtdm/cs/C-42 AbstractThe early age hydration of tricalcium silicate, the main chemical compound in Portland cement, was studied in the presence of synthetic calcium silicate hydrate (C-S-H) addition having C/S ratios=0.8 and 1.2. Isothermal conduction calorimetry, scanning electron microscopy, differential scanning calorimetry and 29 Si MAS NMR were employed in order to investigate events occurring during various stages of the hydration. The results that were analyzed using novel methods in cement chemistry showed that the addition of seeds of synthetic C-S-H significantly accelerated the hydration of C 3 S. The extent of the acceleration was dependant on the amount and chemical composition of the C-S-H seeds. It was suggested that the synthetic C-S-H significantly increased the rate and degree of dissolution of the C 3 S particles.It was also found that the nucleation and silicate polymerization of the C-S-H that formed during the hydration of the C 3 S phase was promoted. Direct evidence of the seeding effect was provided. The properties of the resulting C-S-H hydration products seemed to be dependant on the lime to silica ratio of the synthetic C-S-H. It was suggested that the silicate polymerization and chemical composition of the hydration products of silicate phases may be manipulated through C-S-H seeding. As the chemical and mechanicalproperties of C-S-H are largely controlled by its C/S ratio, this method should provide a unique tool for tailoring the nanostructure of the hydration products of Portland cement through the addition of selective C-S-H seeds for optimum engineering and durability performance.Keywords: Tricalcium Silicate (C 3 S), Calcium Silicate Hy...

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Section: /31supporting

confidence: 92%

Hydration of tricalcium silicate in the presence of synthetic calcium–silicate–hydrate

et al. 2009

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“…It is found from Fig.5 that the degree of hydration of cement in pastes with the mineral admixtures was higher than that in admixture-free pastes at early ages. As reported by some workers [12,13], the acceleration of hydration of cement by the addition of fly ash and silica fume was also indicated in this study. On the assumption that the volume fraction of silica fume and fly ash are assumed not to change with time, the volume fractions of the phases in these cement pastes were calculated (Fig.6).…”

Section: Effects Of Mineral Admixtures On the Degree Of Hydration Of supporting

confidence: 86%

Analysis of cement pastes and mortars by a combination of backscatter-based SEM image analysis and calculations based on the Powers model

Igarashi

Kawamura

Watanabe

2004

Cement and Concrete Composites

123

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Formation of microstructure in cement pastes and mortars were quantitatively analyzed by the SEM-BSE image analysis. Effects of water/cement ratio and of the addition of mineral admixtures on the contents of unhydrated cement particles and pores were discussed. The proportions of each phase obtained by the analyses were compared with proportions calculated on the Powers model. It was found from comparisons that the volume fractions of the residual cement and pores obtained by the image analysis did not contradict those estimated from the Powers model. Lower water/cement ratio pastes and those undergoing pozzolanic reaction showed less fine capillary pores. It was also found that large capillary pores still remained in the mixtures at long ages. The gel/space ratio in the Powers and Brownyard equation was calculated from the phase constituents determined by the image analysis. For mortars without mineral admixture, the gel/space ratio by the image analysis could be related to the strength.

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“…The average Ca/Si molar ratio of the overall C-S-H gel in fly ash -cement pastes, calculated by the mass balance method [46][47], is plotted as a function of the fly ash replacement ratio in Figure 8. It is clear that, with 28 days of hydration time, the average Ca/Si molar ratio measured in the present study decreases linearly from 2.1 for OPC paste to 1.55 for FA50 paste which agrees with data in the literature [47][48][49][50][51].…”

Section: Effect Of Fly Ash On the Reaction Coefficients Of Hydration mentioning

confidence: 99%

Effect of fly ash on the kinetics of Portland cement hydration at different curing temperatures

Narmluk

Nawa

2011

Cement and Concrete Research

185

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The hydration of tricalcium silicate in the presence of colloidal silica

Cited by 27 publications

References 9 publications

Hydration of tricalcium silicate in the presence of synthetic calcium–silicate–hydrate

Hydration of tricalcium silicate in the presence of synthetic calcium–silicate–hydrate

Analysis of cement pastes and mortars by a combination of backscatter-based SEM image analysis and calculations based on the Powers model

Effect of fly ash on the kinetics of Portland cement hydration at different curing temperatures

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