Synthesis and characterization of hydrogarnet Ca3(AlxFe1−x)2(SiO4)y(OH)4(3−y)

Dilnesa, Belay Zeleke; Lothenbach, Barbara; Renaudin, Guillaume; Wichser, Adrian; Kulik, Dmitrii A.

doi:10.1016/j.cemconres.2014.02.001

Cited by 229 publications

(144 citation statements)

References 47 publications

Supporting

Mentioning

128

Contrasting

Unclassified

Order By: Relevance

“…Iron was assumed to precipitate in all cases as ferrihydrite. The formation of the siliceous hydrogarnet and thaumasite was excluded due to kinetic reasons [68,70] [24] were used as proposed by Kulik et al [71].…”

Section: Thermodynamic Modellingmentioning

confidence: 99%

“…Chemical interactions involving solids, solid solutions, aqueous electrolyte and gas phase are considered simultaneously. The thermodynamic data for aqueous species as well as for many solids were taken from the PSI-GEMS thermodynamic database [64,65], while the solubility products for cement minerals were taken from the cemdata07 database [66,67] completed with the recently determined solubility products of siliceous hydrogarnet [68] and the CSHQ model for C-S-H [59]. The CSHQ model as given in Kulik [69] calculates, based on an ideal solid solution between different end-members, compositions of the solid C-S-H from a Ca/Si = 0.67 to approximately Ca/Si = 1.6.…”

Section: Thermodynamic Modellingmentioning

confidence: 99%

See 1 more Smart Citation

The pore solution of blended cements: a review

et al. 2015

Self Cite

View full text Add to dashboard Cite

This paper is the work of working group 3 of the RILEM Technical Committee on Hydration and Microstructure of Concrete with SCM (TC 238-SCM). The pore solution is an essential but often overlooked part of hydrated cements. The composition of the cement pore solution reflects the ongoing hydration processes and determines which solid phases are stable and may precipitate, and which phases are unstable and may dissolve. The study of the cement pore solution therefore contributes to the understanding of the mechanisms as well as of the kinetics of cement hydration. This paper reviews the impact of supplementary cementitious materials (SCMs) on the pore solution composition of blended cements. In a first part, the extraction and analysis methods of cement pore solutions are reviewed, leading to a set of practical guidelines and recommendations. In a second part, an extensive literature survey is used to document the effect of the addition of SCMs (blast furnace slag, fly ash and silica fume) on the pore solution. Finally, in a third part the collected literature data are compared to thermodynamic simulations. The performance and current limitations of thermodynamic modelling of blended cement hydration are demonstrated and discussed in view of future progress.

show abstract

Section: Thermodynamic Modellingmentioning

confidence: 99%

Section: Thermodynamic Modellingmentioning

confidence: 99%

The pore solution of blended cements: a review

et al. 2015

Self Cite

View full text Add to dashboard Cite

show abstract

“…Thermodynamic modelling was performed in the GEM Selektor v.3 software (http://gems.web.psi.ch/) [26,27] using the PSI/Nagra 12/07 thermodynamic database [28], which is updated from [29] via the inclusion of two additional dissolved (alumino)silicate species, and the CE M D ATA 0 7 thermodynamic database [9,10,[30][31][32][33][34][35] updated to include recently published data for Al(OH) 3 and hydrogarnet phases [24,36]. Solubility products (K so ) for C-(A-)S-H, and effective saturation indices (SI*) for relevant solid phases, were calculated from experimental data obtained here.…”

Section: C-(a-)s-mentioning

confidence: 99%

Effect of temperature and aluminium on calcium (alumino)silicate hydrate chemistry under equilibrium conditions

Myers

L’Hôpital

Provis

et al. 2015

Cement and Concrete Research

Self Cite

320

130

View full text Add to dashboard Cite

ReuseUnless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. KeywordsTemperature, Calcium-Silicate-Hydrate (C-S-H), Thermodynamic Calculations, Hydration Products, Blended Cement. AbstractThere exists limited information regarding the effect of temperature on the structure and solubility of calcium aluminosilicate hydrate (C-A-S-H). Here, calcium (alumino)silicate hydrate (C-(A-)S-H) is synthesised at Ca/Si = 1, Al/Si ≤ 0.15 and equilibrated at 7-80°C. These systems increase in phase-purity, long-range order, and degree of polymerisation of C-(A-)S-H chains at higher temperatures; the most highly polymerised, crystalline and crosslinked C-(A-)S-H product is formed at Al/Si = 0.1 and 80°C. Solubility products for C-(A-)S-H were calculated via determination of the solid-phase compositions and measurements of the concentrations of dissolved species in contact with the solid products, and show that the solubilities of C-(A-)S-H change slightly, within the experimental uncertainty, as a function of Al/Si ratio and temperature between 7°C and 80°C. These results are important in the development of thermodynamic models for C-(A-)S-H to enable accurate thermodynamic modelling of cement-based materials. IntroductionTemperatures experienced by cement and concrete based construction materials in service can vary greatly, due to heat evolution from cement hydration, variable ambient environmental conditions, steam curing, and other factors. understanding of the nature of C-S-H and other constituent phases in these systems at equilibrium [6][7][8][9] has meant that hydrated neat PC materials can be accurately described by thermodynamic modelling at temperatures from 5°C to above 80°C [10]. Extending this analysis to the CaO-Al 2 O 3 -SiO 2 -H 2 O system represents a major step toward applying this technique to hydrated PC blends with high replacement levels of supplementary cementitious materials, which are not fully described by existing thermodynamic models [11]. This will enable a much deeper understanding of the chemistry and phase composition, and hence durability, of these materials in service.The chemistry and structure of calcium (alumino)silicate hydrate (C-(A-)S-H) products at ambient conditions have been the subject of sustained research for more than half a...

show abstract

“…There is an increasing interest in the synthesis and advanced characterisation (Balonis and Glasser, 2009) of single phases that are involved in the hydration of cements, such as ye'elimite (Cuesta et al, 2013), belite (Cuesta et al, , 2014, alite (De la Torre et al, 2002), katoite (Dilnesa et al, 2014), stratlingite (Kwan et al, 1995) and so on. The formation of these new crystalline phases in the cement pastes can be determined and quantified through X-ray powder diffraction (XRPD) jointly with the Rietveld methodology.…”

Section: Introductionmentioning

confidence: 99%

Structure of stratlingite and effect of hydration methodology on microstructure

Santacruz

Torre

Álvarez-Pinazo

et al. 2016

Advances in Cement Research

View full text Add to dashboard Cite

Stratlingite, Ca 4 Al 2 (OH) 12 [AlSi(OH) 8 ] 2 ·2H 2 O, is an AFm phase which appears as a hydration product of aluminium-rich cements. These binders may be calcium aluminate cements, calcium sulfoaluminate cements and also belite calcium sulfo-aluminate (BCSA) cements. The structure of stratlingite is known from single-crystal studies of tiny minerals but their bulk formation, crystal structure and microstructure of powders is poorly understood. This paper reports on the synthesis of stratlingite and a complete structural and microstructural characterisation by synchrotron X-ray powder diffraction, nuclear magnetic resonance, scanning electron microscopy and thermal analyses. The structural and microstructural models have important implications for a correct quantitative phase analysis of stratlingite in cement pastes (for instance, in pastes of BCSA cements). The microstructure of stratlingite formed in cement pastes is highly dependent on the hydration conditions. In BCSA pastes, the (003) line position of stratlingite appears slightly shifted towards higher diffracting angles (lower inter-layered distance) after stopping hydration compared to that of a similar phase present in a paste analysed without stopping hydration. This is related to dehydration and disorder. This shift and peak broadening is even larger when the paste has suffered partial dehydration during curing (apart from stopping hydration). A microstructural study is presented.

show abstract

Synthesis and characterization of hydrogarnet Ca3(AlxFe1−x)2(SiO4)y(OH)4(3−y)

Cited by 229 publications

References 47 publications

The pore solution of blended cements: a review

The pore solution of blended cements: a review

Effect of temperature and aluminium on calcium (alumino)silicate hydrate chemistry under equilibrium conditions

Structure of stratlingite and effect of hydration methodology on microstructure

Contact Info

Product

Resources

About