Hydration of Portland cement with additions of calcium sulfoaluminates

Saoût, Gwenn Le; Lothenbach, Barbara; Hori, Akihiro; Higuchi, Takayuki; Winnefeld, Frank

doi:10.1016/j.cemconres.2012.10.011

Cited by 219 publications

(82 citation statements)

References 56 publications

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“…4, IC and ICP-OES are the most common methods. Generally the sulfate concentrations determined by IC agree with the total sulfur concentrations from ICP-OES [17], with the notable exception of cements containing slags, where reduced sulfur species such as HS -are present. For slag containing cements the pore solutions should not be acidified to avoid the evaporation of gaseous H 2 S and SO 2 .…”

Section: Thermodynamic Modellingsupporting

confidence: 63%

The pore solution of blended cements: a review

et al. 2015

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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.

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Section: Thermodynamic Modellingsupporting

confidence: 63%

The pore solution of blended cements: a review

et al. 2015

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“…The aluminium uptake in synthetic C-S-H (this study and [17]) and in Portland cements (also blended with fly ash or silica fume) with Ca/ Si ratios from 0.68 [57] to 2.0 [58] shows a strong correlation with the dissolved aluminium concentrations as shown in Fig. 20.…”

Section: Comparison Of Synthetic C-s-h With C-s-h In Cementmentioning

confidence: 58%

Incorporation of aluminium in calcium-silicate-hydrates

L’Hôpital

Lothenbach

Saoût

et al. 2015

Cement and Concrete Research

380

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“…Although they have been proposed as a sustainable alternative to OPC, some technological challenges (Álvarez-Pinazo et al, 2013), such as relatively low mechanical strengths and durability, need to be improved. The understanding of the hydration processes (Klaus et al, 2013;Le Saoût et al, 2013;Winnefeld and Lothenbach, 2010) should lead to an improved design of the clinker composition (activation) and better performances after setting and hardening.…”

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

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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.

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Hydration of Portland cement with additions of calcium sulfoaluminates

Cited by 219 publications

References 56 publications

The pore solution of blended cements: a review

The pore solution of blended cements: a review

Incorporation of aluminium in calcium-silicate-hydrates

Structure of stratlingite and effect of hydration methodology on microstructure

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