Enthalpy of formation of ye’elimite and ternesite

Skalamprinos, Solon; Galán, Isabel Moratilla; Hanein, Theodore; Glasser, F. P.

doi:10.1007/s10973-017-6751-0

Cited by 17 publications

(7 citation statements)

References 47 publications

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“…Thermodynamic data for ye'elimite and ternesite are not included in the compilation of the title study as they are still being developed; however, current available data can be found in Refs. [8,67,[69][70][71].…”

Section: Discussion and Future Workmentioning

confidence: 99%

Thermodynamic data for cement clinkering

Hanein

Glasser

Bannerman

2020

Cement and Concrete Research

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The proportions of cement clinker phases produced by the pyro-processing of a rawmaterial mix are often predicted through the Bogue equations, established in the 1930s; however, the Bogue approach is limited in its applicability. This presents a challenge as the cement industry is seeking innovative and more environmentally friendly cement clinker formulations and production processes. These often go beyond the limitations of the Bogue equations and more flexible approaches are required. Modern thermodynamic calculations allow this flexibility but rely on databases not freely available and often specialised for other applications. The title paper reviews the thermodynamic data for stoichiometric clinker phases and presents a new dataset. The dataset is validated, and its application demonstrated by case studies. Electronic CSV files containing the data which can be parsed for use with existing Gibbs energy minimisation solvers/software is distributed with this article as supplementary material.

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Section: Discussion and Future Workmentioning

confidence: 99%

Thermodynamic data for cement clinkering

Hanein

Glasser

Bannerman

2020

Cement and Concrete Research

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“…Regarding thermodynamic modelling of CSA-based systems still some gaps are existing. There are several thermodynamic datasets for ye'elimite available in literature [32,[203][204][205], which need to be critically reviewed before including a consistent data set into thermodynamic databases. Such data would be needed e.g.…”

Section: Limitations Of Thermodynamicsmentioning

confidence: 99%

“…for calculating the hydration heat flow and the heat of hydration of ye'elimite-based systems, similar as previously done for Portland cement [206]. While thermodynamic data for ternesite was recently determined [41,205], such data seems to be missing for fluorellestadite.…”

Section: Limitations Of Thermodynamicsmentioning

confidence: 99%

Advances in understanding ye'elimite-rich cements

Haha

Winnefeld²,

Pisch³

2019

Cement and Concrete Research

111

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In this review, we discuss the recent advances in understanding ye'elimite-rich cements. These cements can be classified as follows:(1) low belite one namely called calcium sulphoaluminate cements (CSA) where the main use is in special applications or when combined with OPC and calcium sulphate sources in structural application (2) High belite one namely Belite Ye'elimite ferrite cement (BYF) where their development as an alternative low carbon binders is aimed to replace Portland clinker in structural applications.The main hydrating phase at early age in both systems is ye'elimite. Its formation, its reactivity and its extent of reaction and space filling when hydrating define the properties of the cement. Recent advances in understanding these properties are critically analyzed.Recent activities on the clinker formation and production at laboratory and industrial scale are reported. Additionally, the effects of aluminates rich minerals are reviewed in detail, with a focus on their influence on the hydration mechanism and the resulting hydrates assemblage and its stability in ye'elimite rich systems. Applicability of thermodynamic calculation and its limitations are discussed to underline the role of the environment at each reaction step on the hydrates assemblage.

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“…The ternesite structure, as well as the formation and hydration characteristics of phases in the CaO-SiO 2 -CaSO 4 system, were subject to several studies [24][25][26][27]. Ternesite, a calcium-silicate-sulfate is isostructural with silicocarnotite [28,29] and is built up of isolated SiO 4 and SO 4 tetrahedra connected via calcium atoms that are 6-or 7-fold coordinated.…”

Section: Introductionmentioning

confidence: 99%

In Situ X-ray Diffraction at High Temperatures: Formation of Ca2SiO4 and Ternesite in Recycled Autoclaved Aerated Concrete

2021

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This study provides an insight into possible recycling processes for autoclaved aerated concrete (AAC) at low temperatures (<1000 °C). Belite binders were synthesized from wastes of AAC by the addition of CaCO3 and adaption of the molar CaO/SiO2 (C/S ratio) in the range of 2 to 2.5. An in situ XRD study performed during heating up to 1000 °C and subsequent quenching to room temperature evidenced the formation of ternesite besides C2S in sulfate-containing systems. Several factors influencing the reaction kinetics and the evolution of the phase composition were investigated thoroughly. Increased sulfate content and dwelling time during heating increase the ternesite content and promote the formation of highly crystalline α’H-C2S. The C/S-ratio of the starting materials has to be adjusted to the sulfate content in order to prevent the formation of ternesite at the expense of C2S. Ternesite remains stable during quenching to room temperature or even increases in amount, except in cases of very low cooling rates or high residual quartz contents (C/S-ratio ≤ 2). Temperature and range of α’H-C2S to β-C2S phase transition on quenching strongly depend on the cooling rate. The onset temperature for β-C2S formation varies between 540 °C (slow quench) and 450 °C (fast quench). Thermal expansion coefficients of ternesite are calculated showing similarity with C2S. The incorporation of CaSO4 modules in the structure switches the direction of maximum compression.

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Enthalpy of formation of ye’elimite and ternesite

Cited by 17 publications

References 47 publications

Thermodynamic data for cement clinkering

Thermodynamic data for cement clinkering

Advances in understanding ye'elimite-rich cements

In Situ X-ray Diffraction at High Temperatures: Formation of Ca2SiO4 and Ternesite in Recycled Autoclaved Aerated Concrete

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